Centrifugal Fans double inlet with direct drive backwardcurved true airfoil blades. Issue 1.4 September 2013

Transcription

1 Centrifugal Fans double inlet with direct drive backwardcurved true airfoil blades Issue 1.4 September 013 1

2 The overall picture will decide Complete systems by Nicotra ebhardt Depending on the model of the fan, the efficiency grade N set in accordance with the Er Directive achieved from 013 and 015 respectively. Efficiency grade N to Er-Directive Year Centrifugal fans with backward curved blades without housing static The efficiency grade designates a parameter in the calculation of the target energy efficiency of a fan depending on the electric input power when operating at the optimal energy efficiency point. The figure of parameter N corresponds to the target energy efficiency with a power of 10 kw. To make the selection easier for our customers, we offer complete systems as defined by the Er Directive! In order to compare the systems, the total efficiency η e of the fan without speed regulation is considered. h e = u(s) / e with housing static total Centrifugal fans with forward curved blades with housing static total h e = Total efficiency u(s) = Fan gas power when operating at the optimal energy efficiency point e = Electric input power when operating at the optimal energy efficiency point If the system has speed regulation, it will be taken into account with the part load compensation factor C c (see below): Nicotra ebhardt can supply complete systems in all product categories which meet the Er requirements. We offer highly efficient fan systems A with matching components and high efficiency drives belt and direct drive. A with integrated or external control to regulate speed. A with IEC standard motors (IE) or internal rotor motors with brushless DC technology. A and with AC external rotor motors or brushless DC external rotor motors. Building blocks for best values Thanks to the decades-long experience of Nicotra ebhardt all the components of our fans contribute to their high performance. Impellers and blades are optimised for turbulence and therefore particularly efficient. An example: With the latest development, the RLM Evo impeller, the free-running centrifugal fans of Nicotra ebhardt achieve system efficiency grades never reached before. In addition, the brushless DC drives which Nicotra ebhardt offers for its direct drive fans improve the system efficiency grades. The fan technology of Nicotra ebhardt delivers highly efficient systems for all applications. η e = u(s) / e(d) C c ed = Input power of speed regulator when operating at the optimal energy efficiency point C c = part load compensation factor without speed regulation: C c = 1 with speed regulation ed 5 kw: C c = 4 with speed regulation ed < 5 kw: C c = ln( ed ) + 88 η e In order to take the speed regulation into account via the part load compensation factor C c, the following mathematical losses arise in accordance with the formula prescribed by Er for the following typical motor powers: ed = 4.00 kw: C c = 5 (5 %) ed =.0 kw: C c = 6 (6 %) ed = 0. kw: C c = 1.10 (10 %) C c η m η T η r e(d) e u(s) A

3 6.000 m³/h m³/h m³/h.000 m³/h.000 m³/h m³/h C C C ATEX Voltage Brushless-DC External Inverter Forward curved blades galvanised sheet steel Backward curved blades coated steel alvanised steel Coated steel Single inlet Double inlet Er status RZM Er 015 RZ Er 015 RZA Er 015 Flow rate Media temperature control Impeller Casing material Inlet type B

4 proselecta II Simple and reliable selection proselecta II is a technical selection program that allows you to configure your own individually designed fan. It provides you with the opportunity to choose from the entire range of fan types and their associated options. The result from proselecta II is the provision of all the technical data for your fan, including sound level data, dimension specifications and accessories. Apart from that, as a registered user, your purchase prices are provided. Additionally fully dimensioned drawings in dxf format are available, which can be downloaded and transferred straight into your CAD system. So that you can be sure. Models and options that are technically not permissible, are automatically excluded in proselecta II. So there is no chance that you will configure a wrong device option. You can register as a proselecta II user with us, which enables us to offer you faster order processing. What this means for you is: A The complete configuration of your fan with its associated system accessories and belt drive layout. A The possibility to produce fans that operate via a frequency inverter. A The option of saving your own fan configuration on our server. A The opportunity to modify your saved configuration, even over the phone to your Nicotra ebhardt representative. Nicotra ebhardt technologies like... Automated manufacture of compact scroll and impeller with forward curved blades Own motor production for optimal tuniung of motor and fan!

5 Highest system performance and best energy efficiency The RZM rotavent serie Economic, quiet and compact: Through the combination of two high technologies - the aerodynamics of the rotavent impeller combined with energy efficient IEC motors - Nicotra ebhardt has developed a series of coupled direct driven centrifugal fans setting new standards for economy and quiet operation. Your benefits: powerful fan range direct driven with coupling maintenance and wear free drive (no V-belts) short payback time due to high energy saving, especially with long operating periods higher comfort levels through particularly low noise fans and motors problem free speed control from with frequency inverter Top quality for performance and a long service life! Alongside an intelligent construction, aspects such as the quality of materials and workmanship play a crucial role in ensuring a long life cycle. Apart from that, the tried and tested quality of our successful, long-standing RZR series remains the same. And that means robust impeller constructions, noncorrosive impeller shafts and quality bearings for a long life with minimum noise. η e(s)d System efficiency The given System Efficiency is the efficiency of the whole system and includes the individual efficiencies of the component Fan Frequency inverter. C c η m η e(s) η r Er conformity Depending on the model of the fan, the efficiency grade "N" set in accordance with the Er Directive achieved from 013 and 015 respectively. The efficiency grade designates a parameter in the calculation of the target energy efficiency of a fan depending on the electric input power when operating at the optimal energy efficiency point. The figure of parameter "N" corresponds to the target energy efficiency with a power of 10 kw. ed e u(s) Frequency inverter Impeller Make use of our technical selection program proselecta II. You receive all technical data for your fan, easyquickreliable. Efficiency grade "N" to Er Directive Centrifugal fans with backward curved blades with housing Measurement category A, C B, D Efficiency category static total ower range [kw] < < 0 Target energy efficiency h target = 4.56 ln() N h target = 1.10 ln() -. + N h target = 4.56 ln() N h target = 1.10 ln() -. + N Efficiency grade "N" Year A technical data list according to Er-REULATION 37/011/EU of all fans is available at the end of this chapter "RZM". 56

6 The powerful high technologie! Optimal aerodynamics Low turbulance velocity for both inlet and discharge due to the large free cross section and minimal flow restraint of the impeller, an example of aerodynamics and performance of the rotavent. Acoustics Reduction of high frequency noise levels is just one of the advantages of the rotavent, together with optimised AC-motors. Minimal sound levels due to low blade passing frequencies from the optimised impeller geometry of the rotavent. The impeller has obliquely inclined blades with trailing edges, and the throat plate is inclined opposingly. High efficiencies Nicotra ebhardt fans of the RZM rotavent range are operating at high efficiency in wide area of the fan curve. Wear-free drive by direct coupling The use of direct coupling drive avoids wear of the drive as this is the case with belt driven fans. Your benefits: negligible sensitivity to built in disturbances minor pressure loss with free discharge operation smaller, yet greater energy performance Your benefits: reduced size and costs of attenuation and silencers Your benefits: low running costs high efficiency Your benefits: no subsequent filter necessary less dust in the system The benefits of rotavent RZM The high value and precisely manufactured components of rotavent, manufactured with most modern machinery for demanding tolerance standards, are the basis for a product range satisfying highest quality requirements. Version Description Figure RZM 15-00/-0 Lap jointed scroll of galvanised steel sheet with discharge flange and heavy duty reinforced side frames. Medium-heavy duty bearing execution with cast iron housing/strut assemblies. High performance impeller with hollow section true aerofoil blades, welded and epoxy coated. Fan with motor and elastic coupling mounted on a robust base frame. RZM 18-06/-0 Lap jointed scroll of galvanised steel sheet with discharge flange and heavy duty reinforced side frames. Heavy duty bearing execution with split-type plummer block, mounted on robust pedestal. High performance impeller with hollow section true aerofoil blades, welded and epoxy coated. Fan with motor and elastic coupling mounted on a robust base frame. RZM /-10 Heavy duty casing of sheet steel with stiffening members, step welded and coated, with discharge flange. Casing is split on one axis (Size 110), split on two axis (Sizes 10/-10). Heavy duty bearing execution with split-type plummer blocks, mounted on robust pedestal. High performance impeller with hollow section true aerofoil blades, welded and epoxy coated. Fan with motor and elastic coupling mounted on a robust base frame. 57

7 RZM lease note coloured area! N all types suitable N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 6 mm z 1 J 0.33 kgm² Impeller weight Density of media m 10.5 kg r 1 1. kg/m³ a kw 66% ηa (N max ) A a f pd Normal operation area A L WA 4; db /min m/s p F m³/h m³/s q V m/s v N u fη Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band Hz db 188 1/min > q Vopt db > q Vopt db >1.6 q Vopt db Hz db >188 1/min > q Vopt db > q Vopt db >1.6 q Vopt db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 58

8 RZM Nominal current speed Max. fan speed frequency Weight Max. operating power oles size voltage hases frequency Connection RZM 15- kw V Hz A 1/min 1/min Hz kg 00-4W L /0 3~ g/y 8.1/ D Lb 0 3~ g D M 0 3~ g D Sa 0 3~ g D Ma 0 3~ g D-6 1 1Ma 0 3~ g D Mb 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM Ø RD 90 RD 0 RD ZSR ZS WBS ZS 15- ZKE 15-1 ZKF 15-7 RD 0 RD 90 RD L 0 L 90 L Accessories Frequency Inverter Unit MM40 for 3~ Line Choke for 3~ Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- RZM W-16 MM40 3AC 0V.0KW EMV B 6SE-3CC01-0BD D-17 MM40 3AC 0V 3.00KW EMV B 6SE-3CC01-0BD D-19 MM40 3AC 0V 4.00KW EMV B 6SE-3CC01-4BD D-1 MM40 3AC 0V 5.KW EMV B 6SE-3CC0-CD D-3 MM40 3AC 0V 7.KW EMV B 6SE-3CC0-CD D-6 MM40 3AC 0V 1KW EMV B 6SE-3CC0-5CD D-7-6SE-3CC03-5CD3 6SE64-AD31-5CA0 6SE-0BE00-0AA0 59

9 RZM lease note coloured area! N all types suitable Impeller diameter Number of blades Moment of Inertia D r 455 mm z 1 J 0.6 kgm² Impeller weight Density of media m 15.8 kg r 1 1. kg/m³ a kw 15 66% 0 81 ηa (N max ) A a f pd Normal operation area A L WA 4; db /min m/s p F m³/h m³/s q V m/s v N u Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band /min >1679 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db

10 RZM Nominal current speed Max. fan speed frequency Weight Max. operating power oles size voltage hases frequency Connection RZM 15- kw V Hz A 1/min 1/min Hz kg 04-4D M 0 3~ g D Sa 0 3~ g D Ma 0 3~ g D Ma 0 3~ g D L 0 3~ g D L 0 3~ g D-.0 1M 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM Ø k RD 90 RD 0 RD k 78 ZSR ZS WBS ZS ZKE ZKF RD 0 RD 90 RD L 0 L 90 L Accessories Frequency Inverter Unit MM40 for 3~ Line Choke for 3~ Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- RZM D-19 MM40 3AC 0V 4.00KW EMV B 6SE-3CC01-4BD D-1 MM40 3AC 0V 5.KW EMV B 6SE-3CC0-CD D-3 MM40 3AC 0V 7.KW EMV B 6SE-3CC0-CD D-6 MM40 3AC 0V 1KW EMV B 6SE-3CC0-5CD D-8-6SE-3CC03-5CD3 6SE64-AD31-5CA0 6SE-0BE00-0AA0 04-D-8-6SE-3CC04-4DD0 6SE64-AD31-8DA0 6SE-0BE00-0AA0 04-D- - 6SE-3CC04-4DD0 6SE64-AD3-DA0 6SE-0BE00-0AA0 61

11 RZM lease note coloured area! N all types suitable N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 510 mm z 1 J 0.9 kgm² Impeller weight Density of media m 19.9 kg r 1 1. kg/m³ a kw 68% 8 ηa (N max ) A 1/min m/s a f pd Normal operation area db A L WA 4; p F m³/h m³/s q V m/s v N u fη Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band /min >1498 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 6

12 RZM Nominal current speed Max. fan speed frequency Weight Max. operating power oles size voltage hases frequency Connection RZM 15- kw V Hz A 1/min 1/min Hz kg 00-4D M 0 3~ g D Sa 0 3~ g D Ma 0 3~ g D Ma 0 3~ g D L 0 3~ g W M 0 3~ g W L 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM Ø k RD 90 RD 0 RD k 7 ZSR ZS WBS ZS 15- ZKE 15-1 ZKF RD 0 RD 90 RD L 0 L 90 L Accessories Frequency Inverter Unit MM40 for 3~ Line Choke for 3~ Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- RZM D-19 MM40 3AC 0V 4.00KW EMV B 6SE-3CC01-4BD D-1 MM40 3AC 0V 5.KW EMV B 6SE-3CC0-CD D-3 MM40 3AC 0V 7.KW EMV B 6SE-3CC0-CD D-6 MM40 3AC 0V 1KW EMV B 6SE-3CC0-5CD D-8-6SE-3CC03-5CD3 6SE64-AD31-5CA0 6SE-0BE00-0AA0 00-4W- - 6SE-3CC04-4DD0 6SE64-AD31-8DA0 6SE-0BE00-0AA0 00-4W-31-6SE-3CC04-4DD0 6SE64-AD3-DA0 6SE-0BE00-0AA0 63

13 RZM lease note coloured area! N all types suitable N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 5 mm z 1 J 1.7 kgm² Impeller weight Density of media m kg r 1 1. kg/m³ a 00 0 kw 68% 8 ηa (N max ) A 1/min 6 m/s a 0.8 f pd Normal operation area db A L WA 4; p F m³/h N u q V v m³/s m/s Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band 13 1/min >13 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 64

14 RZM Nominal current speed Max. fan speed frequency Weight Max. operating power oles size voltage hases frequency Connection RZM 15- kw V Hz A 1/min 1/min Hz kg 05-4D Ma 0 3~ g D Ma 0 3~ g D L 0 3~ g W M 0 3~ g W L 0 3~ g W L 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM Ø k 1 k RD 90 RD 0 RD k k 1 ZSR ZS WBS ZS ZKE ZKF RD 0 RD 90 RD L 0 L 90 L Accessories Frequency Inverter Unit MM40 for 3~ Line Choke for 3~ Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- RZM D-3 MM40 3AC 0V 7.KW EMV B 6SE-3CC0-CD D-6 MM40 3AC 0V 1KW EMV B 6SE-3CC0-5CD D-8-6SE-3CC03-5CD3 6SE64-AD31-5CA0 6SE-0BE00-0AA0 05-4W- - 6SE-3CC04-4DD0 6SE64-AD31-8DA0 6SE-0BE00-0AA0 05-4W-31-6SE-3CC04-4DD0 6SE64-AD3-DA0 6SE-0BE00-0AA0 05-4W-33-6SE-3CC05-DD0 6SE64-AD33-0DA0 6SE-0BE00-0AA0 65

15 RZM RZM lease note coloured area! N all types suitable N RZM 18 only N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 6 mm z 1 J.4 kgm² Impeller weight Density of media m 38 kg r 1 1. kg/m³ a kw 69% 45 8 ηa (N max ) a f pd Normal operation area A 108 db /min m/s p F q V v A L WA 4; m³/h 0 m³/s m/s N u fη Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band /min >1194 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 66

16 RZM RZM Nominal Max. operating power oles size voltage hases frequency current Connection speed Max. fan speed frequency Weight RZM 15- kw V Hz A 1/min 1/min Hz kg 06-6W M 0 3~ g W M 0 3~ g W M 0 3~ g D L 0 3~ g W M 0 3~ g W L 0 3~ g RZM 18- kw V Hz A 1/min 1/min Hz kg 06-4W L 0 3~ g W S 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM RZM Ø k 1 k RD 90 RD 0 RD k k 8 ZSR ZS WBS ZS ZKE ZKF RD 0 RD 90 RD L 0 L 90 L Accessories Frequency Inverter Unit MM40 for 3~ Line Choke for 3~ Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- RZM W-3 MM40 3AC 0V 4.00KW EMV B 6SE-3CC01-4BD W-4 MM40 3AC 0V 5.KW EMV B 6SE-3CC0-CD W-6 MM40 3AC 0V 7.KW EMV B 6SE-3CC0-CD D-8-6SE-3CC03-5CD3 6SE64-AD31-5CA0 6SE-0BE00-0AA0 06-4W- - 6SE-3CC04-4DD0 6SE64-AD31-8DA0 6SE-0BE00-0AA0 06-4W-31-6SE-3CC04-4DD0 6SE64-AD3-DA0 6SE-0BE00-0AA0 RZM W-34-6SE-3CC05-DD0 6SE64-AD33-0DA0 6SE-0BE00-0AA0 06-4W-36-6SE-3CC08-3ED0 6SE64-AD33-7EA0 6SE-0BE00-0AA0 67

17 RZM RZM lease note coloured area! N all types suitable N RZM 18 only N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 718 mm z 1 J 4.8 kgm² Impeller weight Density of media m 5 kg r 1 1. kg/m³ a kw 69% ηa (N max ) p F a q V v f pd Normal operation area A L WA 4; db A m³/h m³/s m/s 1/min N m/s 45 u fη Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band /min >1064 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 68

18 RZM RZM Nominal Max. operating power oles size voltage hases frequency current Connection speed Max. fan speed frequency Weight RZM 15- kw V Hz A 1/min 1/min Hz kg W M 0 3~ g W L 0 3~ g W L 0 3~ g W L 0 3~ g W L 0 3~ g D S 0 3~ g D M 0 3~ g RZM 18- kw V Hz A 1/min 1/min Hz kg D M 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM RZM Ø k 610 k RD 90 RD 0 RD k k ZSR ZS WBS ZS 15- ZKE 15-1 ZKF RD 0 RD 90 RD L 0 L 90 L Accessories Frequency Inverter Unit MM40 for 3~ Line Choke for 3~ Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- RZM W-6 MM40 3AC 0V 7.KW EMV B 6SE-3CC0-CD W-8 MM40 3AC 0V 1KW EMV B 6SE-3CC0-5CD W-31-6SE-3CC04-4DD0 6SE64-AD31-8DA0 6SE-0BE00-0AA W-31-6SE-3CC04-4DD0 6SE64-AD3-DA0 6SE-0BE00-0AA W-33-6SE-3CC05-DD0 6SE64-AD33-0DA0 6SE-0BE00-0AA D-36-6SE-3CC08-3ED0 6SE64-AD33-7EA0 6SE-0BE00-0AA D-37-6SE-3CC08-3ED0 6SE64-AD34-5EA0 6SE-0BE00-0AA0 RZM D-39-6SE-3CC11-FD0 6SE64-AD-5FA0 6SE-0BE00-0AA0 69

19 RZM RZM lease note coloured area! N all types suitable N RZM 18 only N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 8 mm z 1 J 6.85 kgm² Impeller weight Density of media m 69 kg r 1 1. kg/m³ a kw 69% 84 ηa (N max ) A a db 1/min m/s f pd Normal operation area p F A L WA 4; m³/h 0 5 N u 0.99 fη q V v m³/s m/s Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band 945 1/min >945 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db

20 RZM RZM Nominal Max. operating power oles size voltage hases frequency current Connection speed Max. fan speed frequency Weight RZM 15- kw V Hz A 1/min 1/min Hz kg 00-6W L 0 3~ g W L 0 3~ g W L 0 3~ g W L 0 3~ g W M 0 3~ g W M 0 3~ g RZM 18- kw V Hz A 1/min 1/min Hz kg 00-4D M 0 3~ g D M 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM RZM Ø k 1 k RD 90 RD 0 RD k k ZSR ZS WBS ZS ZKE ZKF RD 0 RD 90 RD L 0 L 90 L Accessories Frequency Inverter Unit MM40 for 3~ Line Choke for 3~ Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- RZM W-8 MM40 3AC 0V 1KW EMV B 6SE-3CC0-5CD W-31-6SE-3CC04-4DD0 6SE64-AD31-8DA0 6SE-0BE00-0AA0 00-6W-33-6SE-3CC04-4DD0 6SE64-AD3-DA0 6SE-0BE00-0AA0 00-6W-34-6SE-3CC05-DD0 6SE64-AD33-0DA0 6SE-0BE00-0AA0 00-6W-37-6SE-3CC08-3ED0 6SE64-AD33-7EA0 6SE-0BE00-0AA0 00-6W-39-6SE-3CC08-3ED0 6SE64-AD33-7EA0 6SE-0BE00-0AA0 RZM D-37-6SE-3CC08-3ED0 6SE64-AD34-5EA0 6SE-0BE00-0AA0 00-4D-39-6SE-3CC11-FD0 6SE64-AD-5FA0 6SE-0BE00-0AA0 71

21 RZM RZM lease note coloured area! N all types suitable N RZM 18 only N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 905 mm z 1 J 15.5 kgm² Impeller weight Density of media m 109 kg r 1 1. kg/m³ a kw 69% 84 ηa (N max ) a A 111 db /min m/s p F q V v 00 3 f pd Normal operation area A L WA 4; m³/h m³/s m/s N 45 u fη Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band 844 1/min >844 1/min > q Vopt > q Vopt >1.6 V opt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 7

22 RZM RZM Nominal Max. operating power oles size voltage hases frequency current Connection speed Max. fan speed frequency Weight RZM 15- kw V Hz A 1/min 1/min Hz kg D L 0 3~ g D La 0 3~ g W L 0 3~ g W M 0 3~ g W M 0 3~ g W S 0 3~ g W M 0 3~ g RZM 18- kw V Hz A 1/min 1/min Hz kg W S 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM RZM Ø k 734 k RD 90 RD 0 RD k1 95 k 39 ZSR ZS WBS ZS ZKE ZKF RD 0 RD 90 RD L 0 L 90 L Accessories Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- Line Choke for 3~ RZM D-31 6SE64-AD31-5CA0 6SE-0BE00-0AA0 6SE-3CC03-5CD D-33 6SE64-AD31-8DA0 6SE-0BE00-0AA0 6SE-3CC04-4DD W-34 6SE64-AD33-0DA0 6SE-0BE00-0AA0 6SE-3CC05-DD W-37 6SE64-AD33-7EA0 6SE-0BE00-0AA0 6SE-3CC08-3ED W-39 6SE64-AD33-7EA0 6SE-0BE00-0AA0 6SE-3CC08-3ED W-41 6SE64-AD34-5EA0 6SE-0BE00-0AA0 6SE-3CC08-3ED W-4 6SE64-AD-5FA0 6SE-0BE00-0AA0 6SE-3CC11-FD0 RZM W-41 6SE64-AD37-5FA0 6SE-0BE00-0AA0 6SE-3CC11-FD0 73

23 RZM 15-0 RZM 18-0 lease note coloured area! N all types suitable N RZM 18 only N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 0 mm z 1 J kgm² Impeller weight Density of media m 133 kg r 1 1. kg/m³ a kw 69% 84 ηa (N max ) a A 1/min 15 m/s p F q V v f pd Normal operation area A L WA 4; db m³/h m³/s m/s N 45 u fη Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band 764 1/min >764 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 74

24 RZM 15-0 RZM 18-0 Nominal Max. operating power oles size voltage hases frequency current Connection speed Max. fan speed frequency Weight RZM 15- kw V Hz A 1/min 1/min Hz kg 0-8D La 0 3~ g D S 0 3~ g D M 0 3~ g D Ma 0 3~ g W M 0 3~ g W S 0 3~ g W M 0 3~ g RZM 18- kw V Hz A 1/min 1/min Hz kg 0-6W S 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM 15-0 RZM Ø k 1 k RD 90 RD 0 RD k k ZSR 51-0 ZS 01-0 WBS 01-0 ZS ZKE ZKF RD 0 RD 90 RD L 0 L 90 L Accessories Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- Line Choke for 3~ RZM D-33 6SE64-AD31-8DA0 6SE-0BE00-0AA0 6SE-3CC04-4DD0 0-8D-36 6SE64-AD3-DA0 6SE-0BE00-0AA0 6SE-3CC04-4DD0 0-8D-37 6SE64-AD33-0DA0 6SE-0BE00-0AA0 6SE-3CC05-DD0 0-8D-39 6SE64-AD33-0DA0 6SE-0BE00-0AA0 6SE-3CC05-DD0 0-6W-39 6SE64-AD33-7EA0 6SE-0BE00-0AA0 6SE-3CC08-3ED0 0-6W-41 6SE64-AD34-5EA0 6SE-0BE00-0AA0 6SE-3CC08-3ED0 0-6W-4 6SE64-AD-5FA0 6SE-0BE00-0AA0 6SE-3CC11-FD0 RZM W-44 6SE64-AD38-8FA0 6SE-0BE00-0AA0 6SE-3CC11-7FD0

25 RZM lease note coloured area! N all types suitable N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 110 mm z 1 J 3 kgm² Impeller weight Density of media m 00 kg r 1 1. kg/m³ a kw % ηa (N max ) a db /min m/s Normal operation area L WA 4; p F m³/h N u fη q V v m³/s m/s Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band 68 1/min >68 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 76

26 RZM Nominal current speed Max. fan speed frequency Weight Max. operating power oles size voltage hases frequency Connection RZM 13- kw V Hz A 1/min 1/min Hz kg 110-8D M 0 3~ g D S 0 3~ g D M 0 3~ g D S 0 3~ g W S 0 3~ g W M 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM ZSR WBS ZS ZKE ZKF x v y v x y RD 0 RD 90 RD L 0 L 90 L Accessories Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- Line Choke for 3~ RZM D-39 6SE64-AD33-0DA0 6SE-0BE00-0AA0 6SE-3CC05-DD D-41 6SE64-AD34-5EA0 6SE-0BE00-0AA0 6SE-3CC08-3ED D-4 6SE64-AD-5FA0 6SE-0BE00-0AA0 6SE-3CC11-FD D-44 6SE64-AD37-5FA0 6SE-0BE00-0AA0 6SE-3CC11-FD W-44 6SE64-AD38-8FA0 6SE-0BE00-0AA0 6SE-3CC11-7FD W-46 6SE64-AD38-8FA0 6SE-0BE00-0AA0 6SE-3CC11-7FD0 77

27 RZM lease note coloured area! N all types suitable N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 1 mm z 1 J 6.5 kgm² Impeller weight Density of media m 63 kg r 1 1. kg/m³ a kw 69% ηa (N max ) a db /min m/s Normal operation area L WA 4; p F m³/h N u fη q V v m³/s m/s Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band 611 1/min >611 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db 78

28 RZM Nominal current speed Max. fan speed frequency Weight Max. operating power oles size voltage hases frequency Connection RZM 13- kw V Hz A 1/min 1/min Hz kg 10-8D M 0 3~ g D S 0 3~ g D M 0 3~ g D L 0 3~ g W L 0 3~ g W L 0 3~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM ZSR WBS 0-10 ZS ZKE ZKF k k 17 RD 0 RD 90 RD L 0 L 90 L Accessories Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- Line Choke for 3~ Interference Suppression Filter - Class A RZM D-4 6SE64-AD-5FA0 6SE-0BE00-0AA0 6SE-3CC11-FD0-10-8D-44 6SE64-AD37-5FA0 6SE-0BE00-0AA0 6SE-3CC11-FD0-10-8D-46 6SE64-AD38-8FA0 6SE-0BE00-0AA0 6SE-3CC11-7FD0-10-8D- 6SE64-AD38-8FA0 6SE-0BE00-0AA0 6SE-3CC11-7FD0-10-6W- 6SE64-UD41-3FA0 6SE-0BE00-0AA0 6SL00-0CE3-8AA0 6SL00-0BE34-4AA0 10-6W-51 6SE64-UD41-3FA0 6SE-0BE00-0AA0 6SL00-0CE3-8AA0 6SL00-0BE34-4AA0 79

29 RZM lease note coloured area! N all types suitable N do not use in this area Impeller diameter Number of blades Moment of Inertia D r 10 mm z 1 J 10 kgm² Impeller weight Density of media m 3 kg r 1 1. kg/m³ a kw 69% ηa (N max ) a db /min m/s 45 p F q V v Normal operation area L WA 4; m³/h m³/s m/s N 0 u fη Measured in installation B according to ISO 51: p d a Determination of the Octave level Relative sound power level for inlet side L Wrel7 at octave band 546 1/min >546 1/min > q Vopt > q Vopt >1.6 q Vopt > q Vopt > q Vopt >1.6 q Vopt Hz db db db db Hz db db db db Relative sound power level for discharge side L Wrel4 at octave band Hz db db db db Hz db db db db

30 RZM Nominal current speed Max. fan speed frequency Weight Max. operating power oles size voltage hases frequency Connection RZM 13- kw V Hz A 1/min 1/min Hz kg 10-8D L 0 3~ g D L 0 3~ g D L 0 3~ g D ~ g code: - W = Asynchronous motor (efficiency class IE) - D = Asynchronous motor Dimensions in mm, subject to change. RZM ZSR WBS 0-10 ZS ZKE ZKF k S/M/L 315-6/8B k 101 RD 0 RD 90 RD L 0 L 90 L Accessories Frequency inverter 6SE64- Control anel for frequency inverter 6SE640- and 6SE64- Line Choke for 3~ Interference Suppression Filter - Class A RZM D- 6SE64-AD38-8FA0 6SE-0BE00-0AA0 6SE-3CC11-7FD0-10-8D-51 6SE64-UD41-3FA0 6SE-0BE00-0AA0 6SL00-0CE3-8AA0 6SL00-0BE34-4AA0 10-8D-5 6SE64-UD41-6A0 6SE-0BE00-0AA0 6SL00-0CE33-3AA0 6SL00-0BE34-4AA0 10-8D-53 6SE64-UD4-0A0 6SE-0BE00-0AA0 6SL00-0CE-1AA0 6SL00-0BE34-4AA0 81

31 Direct driven centrifugal fans / RZM / Description according to Er-REULATION 37/011/EU achieved efficiency required Measurement grade at efficiency Rated motor po Flow rate at op ressure at op at op Overall Efficiency optimum energy grade acc. to wer at optimum timum energy timum energy timum energy "specific efficiency category category efficiency Er since control (VSD) energy efficiency efficiency efficiency efficiency ratio" RZM h e [%] "N" e [kw] q V [m³/h] p F [a] N [1/min] W B W B W-19.7 B W B W B W B W B W-19.6 B W B W B W B W B W-8.0 B W-.4 B W B W B W B W B W B W-.7 B W-31.8 B W B W B W-8.0 B W-.6 B W B W B W-3.3 B W B W B W B W B W B W B W B W B W B W B W B W B W B W B W B

32 Direct driven centrifugal fans / RZM / Description according to Er-REULATION 37/011/EU achieved efficiency required Measurement grade at efficiency Rated motor po Flow rate at op ressure at op at op Overall Efficiency optimum energy grade acc. to wer at optimum timum energy timum energy timum energy "specific efficiency category category efficiency Er since control (VSD) energy efficiency efficiency efficiency efficiency ratio" RZM h e [%] "N" e [kw] q V [m³/h] p F [a] N [1/min] W B W B W B W B W B W B W B W B D B D B W B W B W B W B W B W B D B D B D-37.0 B D-39.6 B W B W B W B W B D-39.6 B D B D B D B W B W-46. B D B D B D B D B W-.3 B W-51.4 B D B D B D B D B W B

33 RZM 15-00/-0 Direct driven centrifugal fans / RZM / Specifications Specifications Hochleistungs-Radialventilatoren RZM 15 rotavent Double inlet fan with direct drive by coupling Lockformed scroll casing made of galvanised steel sheet, with side frames, connecting flange at discharge. Fan with directly coupled motor (incl. TC-Thermistors) fitted on pedestal and base frame. max. Medium temperature + C. High performance impeller with 1 hollow section true aerofoil blades inclined obliquely to the shaft axis, welded in postion and painted. Throat plate inclined obliquely in opposition to blade incination! Inlet cones matched to the impeller reduce entry losses to a minimum. Impeller and shaft balanced as an assembly in according to DIN ISO 19. Shaft accurately trued, connection to motor (B3) realised with elastic rubber coupling. Self aligning double row ball bearings secured by adapter sleeve, mounted within a cast iron housing packed with long life, high performance grease. Can be relubricated when not in service. erformance data (w/o drive) according to tolerance class 1 to DIN Fan data Fan type RZM 15- Volume flow q V m³/h Static pressure p sf a Air density at fan inlet r 1 kg/m³ Air temperature t C N 1/min power N kw Voltage / Frequency U / f V / Hz Sound power level (A weighted) L WA db Weight m kg Fittings / Accessories Drain plug R1/" Inspection cover fitted Corrosion protection S, K90 or Impeller blades continuously welded Shaft from stainless steel Nuts and bolts from stainless steel Thread for impuls sensor fitting Volumeter IMV Copper inlet cone Relubricatable bearing Relube nipple tube to drive side Discharge flange Discharge flexible connection Inlet guards Discharge guard Shaft guard Coupling guard Isolator Frequency inverter unit Universal control device 84

34 RZM 18-06/-0 Direct driven centrifugal fans / RZM / Specifications Specifications High performance centrifugal fan RZM 18 rotavent Double inlet fan with direct drive by coupling Lockformed scroll casing made of galvanised steel sheet, with side frames, connecting flange at discharge. Fan with directly coupled motor (incl. TC-Thermistors) fitted on pedestal and base frame. max. Medium temperature + C. High performance impeller with 1 hollow section true aerofoil blades inclined obliquely to the shaft axis, welded in postion and painted. Throat plate inclined obliquely in opposition to blade incination! Inlet cones matched to the impeller reduce entry losses to a minimum. Impeller and shaft balanced as an assembly in according to DIN ISO 19. Shaft accurately trued, connection to motor (B3) realised with elastic rubber coupling. Self aligning double row ball bearings within standard plummer blocks, mounted on robust support frame. Can be relubricated when not in service. erformance data (w/o drive) according to tolerance class 1 to DIN Fan data Fan type RZM 18- Volume flow q V m³/h Static pressure p sf a Air density at fan inlet r 1 kg/m³ Air temperature t C N 1/min power N kw Voltage / Frequency U / f V / Hz Sound power level (A weighted) L WA db Weight m kg Fittings / Accessories Drain plug R1/" Inspection cover fitted Corrosion protection S, K90 or Impeller blades continuously welded Shaft from stainless steel Nuts and bolts from stainless steel Thread for impuls sensor fitting Volumeter IMV Copper inlet cone Relubricatable bearing Relube nipple tube to drive side Discharge flange Discharge flexible connection Inlet guards Discharge guard Shaft guard Coupling guard Isolator Frequency inverter unit Universal control device 85

35 RZM /-10 Direct driven centrifugal fans / RZM / Specifications Specifications High performance centrifugal fan RZM 13 rotavent Double inlet fan with direct drive by coupling. Heavy duty casing of sheet steel with stiffening members, step welded and painted, with discharge flange. Split on one axis - segments (size 110), Split on two axis - 4 segments (size 10; 10). Fan with directly coupled motor (incl. TC-Thermistors) fitted on pedestal and base frame. max. Medium temperature + C. High performance impeller with 1 hollow section true aerofoil blades inclined obliquely to the shaft axis, welded in postion and painted. Inlet cones matched to the impeller reduce entry losses to a minimum. Impeller and shaft balanced as an assembly in according to DIN ISO 19. Shaft accurately trued, connection to motor (B3) realised with elastic rubber coupling. Self aligning double row roller bearings within standard plummer blocks, mounted on robust support frame. Can be relubricated when not in service. Inlet guard fitted as a standard in accordance with DIN EN ISO erformance data (w/o drive) according to tolerance class 1 to DIN Fan data Fan type RZM 13- Volume flow q V m³/h Static pressure p sf a Air density at fan inlet r 1 kg/m³ Air temperature t C N 1/min power N kw Voltage / Frequency U / f V / Hz Sound power level (A weighted) L WA db Weight m kg Fittings / Accessories Drain plug R1/" Inspection cover fitted Corrosion protection K90 or Impeller blades continuously welded Casing continuously welded inside Casing continuously welded inside and outside Shaft from stainless steel Nuts and bolts from stainless steel Thread for impuls sensor fitting Volumeter IMV Copper inlet cone Relubricatable bearing Relube nipple tube to drive side Discharge flange Discharge flexible connection Discharge guard Shaft guard Coupling guard Isolator Frequency inverter unit Universal control device 86

36 Fittings / Accessories Direct driven centrifugal fans / RZM / Accessories Drain lug R If the fan is outside, or if conveying a medium containing humidty, condensation of water may accumulate inside the fan scroll. For extraction of this water a condense water drain has to be at the lowest point of the scroll. The drain will be provided with a thread for connecting it to a piping. Inspection Door R 1/" - Sizes 00/-0 R 1" - Sizes 110/-10 At order please indicate the required casing position. For the purposes of maintenance and cleaning there is an opening, which can be securely closed by means of an access door, in the fan casing. As it can only be opened with a tool, the access door complies with safety and accident prevention regulations. Additional securing with locking bars can be supplied on request. The site and orientation of the inspection opening depends on the casing position. The position should be specified when ordering according to the following diagram: e.g. Access door, os.. Inspection Door ositions os.1 os.1 os.1 os. os. os. os.3 os.3 os.4 os.3 RZM 00/-0 RZM 110 RZM 10/-10 Dimensions in mm, subject to change. RZM..- RZM..- 00/ / Corrosion rotection Systems Nicotra ebhardt fans are treated with high quality corrosion protection as standard. Under extreme operating conditions, however, additional corrosion protection is advisable. Depending on the use to which the fan is to be put and the degree of exposure to corrosion, we offer various anti-corrosion protection measures. Corrosion protection - Class S Degreasing, ironphosphating owder coating Layer thickness μm, Colour RAL 39 Wet lacquering Layer thickness μm (primer + lacquer finish), Colour RAL 39 Corrosion protection - Class K90 Degreasing, ironphosphating owder coating Layer thickness 90 μm, Colour RAL 39 Wet lacquering Layer thickness 90 μm (primer + lacquer finish), Colour RAL 39 Corrosion protection - Class Degreasing, ironphosphating Thermoplastic powder coating Layer thickness μm, Colour RAL 01 87

37 Fittings / Accessories Direct driven centrifugal fans / RZM / Accessories Continuously welded blades Impeller blades can be continuously welded in order to increase the corrosion resistance when conveying a humid or slightly aggressive medium. The continuous welding has no influence on the material resistance or on the max. tip speed. Stainless Steel Shaft For applications where there is an increased risk of corrosion, an optional shaft made of stainless steel can be supplied. Stainless steel Stainless Steel Nuts and Bolts For applications where there is an increased risk of corrosion, the connecting elements of the fan can be ordered made of stainless steel. Impuls Sensor Thread A tapped hole M6 or M8 can be provided in the pedestal bearing cast housing for admission of sensors to measure the shock impulses. (The measuring connecting piece is not included in the scope of delivery). Inlet Cones Inlet cone of copper or aluminium prevent the production of sparks during operation. These can be employed when spark protection is required, but ATEX is not mandatory. Relubrications The lubrication unit IWN allows the fan bearings to be greased even when in operation. The lubrication tubes screwed into the bearing housing are lead out and fastened at the side wall of the fan. If desired, the lubrication tubes can be lead to the drive side of the fan. IWN 01 - Standard grease, adus S V 3 IWN 11 - Klüber-Staburags NBU1/0K 88

38 Fittings / Accessories Direct driven centrifugal fans / RZM / Accessories rotection guards The fans are designed for installation in equipment and as standard are not equipped with protective guards. They should not be put into operation before all protective devices are fitted and connected! rotective measures carried out as set out in DIN EN ISO 1 "Safety of machinery - Basic concepts, general principles for design". If the application of the fan allows free access to the inlet and discharge apertures, safety devices put in place on the fan in accordance with DIN EN ISO 13857! Suitable safety guards are available as an optional extra. Coupling protection guard Contact guard for the coupling for double inlet centrifugal fans RZM. Design in accordance with DIN EN ISO 13857, made of galvanised or coated sheet steel. Shaft uards Contact guard for the free end of the shaft for double inlet centrifugal fans. Models in accordance with DIN EN ISO 13857, made of painted steel mesh. Flanges and Flexible Connections Made from galvanized or painted steel, to connect ducts and system components to the fan outlet side. Connecting piece with elastic intermediate section for the vibration or impact-noise decoupled connection of the fan to the system or unit. Made out of two connecting flanges with elastic intermediate section. Temperature range / Application Standard up to + C ATEX max. + C 89

39 Fittings / Accessories Direct driven centrifugal fans / RZM / Accessories Anti Vibration Spring Diffusers Anti Vibration Mounts (AVM) are designed to prevent noise and vibrations being transmitted through the base of the fan. AVMs should be mounted beneath the fan base frame so the weight and spring deflections are evenly distributed. They should not be mounted symmetrically around the centre of gravity of the system when idle, because a counter force is induced into the system by the pressure created by the working fan. It is difficult for the manufacturer to establish the position of the AVMs to suit all types of application. Vibration and noise insulation can also be improved by ensuring that the fan is connected to its external environment by a flexible coupling. The AVMs are supplied with the suitable mounting material for the base frame (CC- or U-rofiles). Anti Vibration Spring Diffusers H ZBD ZBD A B C D ~ E ~ F H -0101A* -0101C* M A* -0103C* M10 B A E -0105A* -0105C* M A* -0108C* M10-011A* -011C* M1-010A* -010C* M1-01A* -01C* M1-01A* -01C* M1 * A = for U-profile; C = for CC-profile Anti Vibration Spring Diffusers M10 ZBD S-71A* ZBD S-71C* ~106 S-7A* S-73A* S-7C* S-73C* S-74A* S-74C* S-A* S-C* 95 S-76A* S-76C* S-77A* S-78A* S-77C* S-78C* * A = for U-profile; C = for CC-profile 90

40 Fittings / Accessories Direct driven centrifugal fans / RZM / Accessories Volumeter p in With the flow measuring device it is possible to easilymeasure / monitor the flow rate after the fan is. A pressure tapping at a predetermined position on the inlet cone is provided whereby the differential pressure in relation to the static pressure is measured in front ofthe inlet cone in a static atmosphere. q V = K p Dü volume flow q V [m³/h] calibration factor K [m²s/h] density of media r [kg/m³] pressure difference at cone Dp Dü [a] In order to calculate the flow rate, a calibrating factor "K" is required. This factor is determined by comparativemeasurement on a standard test rig. Calibration factors Measuring connector in inlet cone Hose pipe to connecting piece in the side wall Connecting piece (external diameter of 6mm) for the pressure measurement RZM..- K10 [m²s/h] RZM..- K10 [m²s/h] p in Standard-calibration faktor K10 <10 % Where fans are built into a plenum, the pressure difference between the static pressure in the inlet side plenum and the pressure on the inlet cone is to bemeasured. It ensured that the static pressureto be measured in front of the inlet cone is not tampered by dynamic pressure fractions. It is often recommended to arrange a ring of points on the wall facing the outlet side as illustrated in the sketch. When using the K factors specified below, a minimum clearance of 0.5 D between the inlet cone of the fan and the side wall of the plenum maintained. Indentations that obstruct the flow to the cone canlead to faults when measuring the flow rate. In the event that the differential pressure is fed via a pressure sensor, the signal can also be used for regulating purposes. Electrical accessories Electrical accessories (Frequency converter, Differential pressure sensor, Universal control device, Isolator) see chapter "Accessories". 91