Pressure Measurement Single-range transmitters for general applications

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Darren Booker
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submersible sensor for hydrostatic level measurement with cap made of PPE (left), stainless steel (mid) and ETFE (right).

1 Siemens AG 07 Overview Function SITRANS LH00 Transmitter for hydrostatic level U const. p U I EM Sensor Connection for auxiliary power supply Vent pipe with humidity filter Protective conductor connection/ Equipotential bonding Diaphragm The pressure transmitter SITRANS LH00 is a submersible sensor for hydrostatic level measurement with cap made of PPE (left), stainless steel (mid) and ETFE (right). The pressure transmitter measures the liquid levels in tanks, containers, channels and dams. The SITRANS LH00 pressure transmitters are available for various measuring ranges and with explosion protection as an option. A junction box and a cable hanger are available as accessories for simple installation. Benefits Compact design Simple installation Small error in measurement (0. % typical) Degree of protection IP68 Application SITRANS LH00 pressure transmitters are used in the following branches, for example: Shipbuilding Water/waste water supply Drinking water facilities For use in unpressurized/open vessels and wells Desalination plants Design The pressure transmitter has a built-in ceramic sensor which is equipped with a Wheatstone resistance bridge. These pressure transmitters are equipped with an electronic circuit fitted together with the sensor in a stainless steel housing. In addition, the connecting cable contains a vent pipe which is equipped with a humidity filter to prevent the build-up of condensation. The diaphragm is protected against external influences by a protective cap. The sensor, the electronics and the connecting cable are housed in an enclosure with small dimensions. The pressure transmitter is temperature-compensated for a wide temperature range. SITRANS LH00 pressure transmitter, mode of operation and connection diagram On one side of the sensor (), the diaphragm () is exposed to the hydrostatic pressure which is proportional to the submersion depth. This pressure is compared with atmospheric pressure. Pressure compensation is carried out using the vent pipe () in the connecting cable. The vent pipe is equipped with a humidity filter which prevents the build-up of condensation in the vent pipe. The hydrostatic pressure of the liquid column acts on the diaphragm of the sensor and transmits the pressure to the Wheatstone resistance bridge in the sensor. The output voltage of the sensor is applied to the electronic circuit where it is converted into an output current of to 0 ma. The protective conductor connection/equipotential bonding () is connected to the enclosure. Integration It is generally recommended that the connecting cable of the SITRANS LH00 transmitter is connected to the junction box, which can be ordered separately, and secured with the cable hanger, also available separately. The junction box has to be installed near the measuring point, but outside the media. If the medium is anything other than water, it is also necessary to check compatibility with the specified materials of the transmitter, cable and gasket. To measuredvalue processing Venting pipe Junction box 7MF7-8AA, open, schematic diagram To transmitter 7MF7 Siemens FI 0 News January 07

2 Siemens AG 07 SITRANS LH00 Transmitter for hydrostatic level Measuring point setup, generally with junction box 7MF7-8AA and 7MF7-8AB cable hanger Technical specifications SITRANS LH00 (submersible sensor) Mode of operation Measuring principle Piezo-resistive Input Measured variable Hydrostatic level Measuring range Max. permissible operating pressure 0... mh O (0... fth O). bar (.8 psi) (corresponds to mh O ( fth O)) 0... mh O ( fth O). bar (.8 psi) (corresponds to mh O ( fth O)) 0... mh O ( fth O). bar (.8 psi) (corresponds to mh O ( fth O)) 0... mh O (0... fth O) bar (9 psi) (corresponds to 0 mh O (60 fth O)) 0... mh O (0... fth O) bar (9 psi) (corresponds to 0 mh O (60 fth O)) mh O ( fth O) bar (9 psi) (corresponds to 0 mh O (60 fth O)) mh O ( fth O) bar (7. psi) (corresponds to 0 mho (0 fth O)) mh O ( fth O) 0 bar ( psi) (corresponds to 00 mh O (00 fth O)) mh O ( fth O) 0 bar (90 psi) (corresponds to 00 mh O (600 fth O)) Special measuring ranges Up to 00 mh O (00 fth O) 0 bar (90 psi) (corresponds to 00 mh O (600 fth O)) Up to 60 mh O (80 fth O) bar (8 psi) (corresponds to 0 mh O (70 fth O)) Measuring range bar.bar bar.bar bar.bar bar bar bar bar bar bar 0... bar bar 0... bar 0bar 0... bar 0bar Special measuring range Up to 0 bar 0bar Up to 6 bar bar Output Output signal...0 ma Measuring accuracy According to IEC Error in measurement at limit setting 0. % of full-scale value (typical) including hysteresis and reproducibility 0. % of full-scale value (maximum) Influence of ambient temperature 0.0 %/0 K of full-scale value (zero and span) Long-term stability 0. % of full-scale value/year (zero and span) Rated conditions Ambient conditions Process temperature C ( F) Storage temperature C ( F) Degree of protection according to IP68 IEC 609 Siemens FI 0 News January 07

3 Siemens AG 07 Design Weight 0. kg ( 0.88 lb) Cable 0.08 kg/m ( 0.09 lb/ft) Electrical connection Cable with conductors, vent pipe and integrated humidity filter Material Seal diaphragm Al O ceramic, 99.6 % Enclosure Stainless steel, mat. no..0/6l and.9/90l (sea water applications) respectively Gasket FPM (standard) EPDM (optional) Connecting cable PE (standard/drinking water applications) FEP (for aggressive media) Cap Stainless steel, PPE or ETFE Auxiliary power Terminal voltage on pressure transmitter U B V DC for transmitter with 0... V DC intrinsic safety explosion protection Certificates and approvals Drinking water approval (ACS) Pending Drinking water approval (WRAS) Pending Drinking water approval (DVGW/ Pending KTW W70) EAC/EAC-Ex TC RU C-DE.ГБ0.В.008 OC НАНИО «ЦСВЭ» Underwriters Laboratories (UL) Pending Shipbuilding approval (LR) Pending Shipbuilding approval (DNV/GL) Pending Shipbuilding approval (BV) Pending Shipbuilding approval (ABS) Pending Pressure equipment directive The transmitter is not subject to the pressure equipment directive (PED 0/68/EU) Explosion protection IEC Ex ATEX EAC Ex SEV 6 ATEX 0 IEC Ex SEV Intrinsic safety "i" Marking II G Ex ia IIC T Ga SITRANS LH00 Transmitter for hydrostatic level Junction box Application Design Weight Electrical connection Cable entry Enclosure material Vent pipe for atmospheric pressure Screw for cable strength cord Rated conditions Degree of protection according to IEC 609 Cable hanger Application Design Weight Material For connecting the transmitter cable 0. kg (0. lb) x -way (8 to 8 AWG) x M0x. Polycarbonate IP6 For mounting the transmitter 0.6 kg (0. lb) Galvanized steel, polyamide Siemens FI 0 News January 07

4 Siemens AG 07 SITRANS LH00 Transmitter for hydrostatic level Selection and ordering data Article Order No. code SITRANS LH00 (submersible sensor) For hydrostatic level measurement, 7 M F 7 - submersible transmitter, two-wire connection, 0 ma, body material see Order option, measuring cell Al O ceramics (99.6 % purity), with fixed mounted cable, material of protective cap at PE cable: PPE (colour black) material of protective cap at FEP cable: PPE (colour white) Note: junction box and cable hanger have to be ordered separately. Click on the Article No. for the online configuration in the PIA Life Cycle Portal. Measuring range Cable length 0...mH O m } A 0... mh O m } B 0...mH O 0 m } C 0... mh O 0 m } D 0... mh O 0 m } E mh O 0 m } F mh O 0 m } H mh O 0 m } K mh O 0 m } L 0...ftH O m ( ft) A 0...6ftH O m ( ft) B 0...9ftH O 0 m ( 0 ft) C 0... fth O 0 m ( 0 ft) D 0... fth O 0 m ( 0 ft) E fth O 0 m ( 0 ft) F fth O 0 m ( 60 ft) H fth O 0 m ( 90 ft) K fth O 0 m ( 0 ft) L bar m A bar m B bar 0 m C bar 0 m D bar 0 m E bar 0 m F 0... bar 0 m H 0... bar 0 m K 0... bar 0 m L Special versions: Measuring ranges for special versions between 0... mh O and mh O or 0... fth O and fth O or bar and bar possible. Selection and ordering data SITRANS LH00 (submersible sensor) Article No. Order code 7 M F 7 - PE cable for general purpose and drinking water applications Special cable length Order code and plain text: Y0: Cable length... 9 X H.. Y 0 m ( 0 ft) H A m ( 6 ft) H B 7 m ( ft) H C 0 m ( ft) H D m ( 0ft) H E 0 m ( 6 ft) H F m ( 80 ft) H G 0 m ( 00 ft) H H 0 m ( 0 ft) H J 0 m ( 60 ft) H K 60 m ( 00 ft) H L 70 m ( 0 ft) H M 80 m ( 6 ft) H N 90 m ( 9 ft) H P 00 m ( 0 ft) H Q m ( 0 ft) H R 0 m ( 9 ft) H S 7 m ( 7 ft) H T 00 m ( 60 ft) H U m ( 70 ft) H V 0 m ( 80 ft) H W 7 m ( 900 ft) H X 00 m ( 990 ft) H A 0 m ( 0 ft) H B 00 m ( 0 ft) H C 0 m ( 80 ft) H D 00 m ( 60 ft) H E 0 m ( 8 ft) H F 600 m ( 980 ft) H G 60 m ( ft) H H 700 m ( 0 ft) H J 70 m ( 7 ft) H K 800 m ( 60 ft) H L 80 m ( 800 ft) H M 900 m ( 970 ft) H N 90 m ( ft) H P 000 m ( 00 ft) H Q Other special cable length Order codes and plain text: HY: Cable length... Y0: Measuring range... 9 X H Y Y 0 Siemens FI 0 News January 07

5 Siemens AG 07 Selection and ordering data Article No. Order code SITRANS LH00 (submersible sensor) 7 M F 7 - FEP cable for aggressive media Special cable length Order code and plain text: 9 X H.. Y 0 Y0: Cable length... m ( 0 ft) H A m ( 6 ft) H B 7 m ( ft) H C 0 m ( ft) H D m ( 0ft) H E 0 m ( 6 ft) H F m ( 80 ft) H G 0 m ( 00 ft) H H 0 m ( 0 ft) H J 0 m ( 60 ft) H K 60 m ( 00 ft) H L 70 m ( 0 ft) H M 80 m ( 6 ft) H N 90 m ( 9 ft) H P 00 m ( 0 ft) H Q m ( 0 ft) H R 0 m ( 9 ft) H S 7 m ( 7 ft) H T 00 m ( 60 ft) H U m ( 70 ft) H V 0 m ( 80 ft) H W 7 m ( 900 ft) H X 00 m ( 990 ft) H 6 A 0 m ( 0 ft) H 6 B 00 m ( 0 ft) H 6 C 0 m ( 80 ft) H 6 D 00 m ( 60 ft) H 6 E 0 m ( 8 ft) H 6 F 600 m ( 980 ft) H 6 G 60 m ( ft) H 6 H 700 m ( 0 ft) H 6 J 70 m ( 7 ft) H 6 K 800 m ( 60 ft) H 6 L 80 m ( 800 ft) H 6 M 900 m ( 970 ft) H 6 N 90 m ( ft) H 6 P 000 m ( 00 ft) H 6 Q Other special cable length Order codes and plain text: HY: Cable length... Y0: Measuring range... 9 X H Y Y 0 SITRANS LH00 Transmitter for hydrostatic level Selection and ordering data SITRANS LH00 (submersible sensor) Material of housing Stainless steel 6L (.0) Stainless steel 6L (.0) Stainless steel 6L (.0) Stainless steel 90L (.9) for sea water applications Material of protective cap Protective cap PPE (standard with PE cable) Protective cap ETFE (standard with FEP cable) Stainless steel 6L (.0) Protective cap PPE Article No. Order code 7 M F 7 - } A Stainless steel 90L Protective cap ETFE E (.9) for sea water applications Stainless steel 90L Stainless steel 90L F (.9) for seawater (.9) for seawater applications applications Sealing material between sensor and housing FPM (Standard) } EPDM (for drinking water) Explosion protection without } 0 With ATEX II G Ex ia IIC T Ga and } IECEx Ex ia IIC T Ga (only possible for cable length 00 m (990 ft) Additional versions Order code Quality Inspection Certificate (factory calibration) C to IEC Accessories/spare parts Article No. Junction box } 7MF7-8AA Cable hanger } 7MF7-8AB Protective caps, PPE, as spare part } 7MF7-8AD (0-pack) Protective caps, ETFE, as spare part } 7MF7-8AE (0-pack) Humidity filters as spare part } 7MF7-8AF (0-pack) Protective cap, stainless steel 6L } 7MF7-8AG (.0) for waste water applications Protective cap, stainless steel 90L } 7MF7-8AH (.9) for sea water applications } Available ex stock We can offer shorter delivery times for configurations designated with the Quick Ship Symbol. For details see page 9/ in the appendix. B C D Siemens FI 0 News January 07

6 Siemens AG 07 SITRANS LH00 Transmitter for hydrostatic level Dimensional drawings Sensor with protective cap (PPE, ETFE) ~6 (6.) 9 (0.7) Ø0 (.8) Ø0 (.8) 0. (0.) 6 Ø6. (.0) Sensor with protective cap (stainless steel) ~69 (6.6) 90 (7.) 8. (0.7) 7 Ø6. (.0) 8 (.9) 6 7 Cable, sheat Ø 8. (0.) - (blue) (brown) Protective conductor connection/equipotential bonding (white) Vent pipe with humidity filter Ø (0.0) (inner diameter) Protective cap (PPE or PTFE) with x Ø. (0.0) holes Protective cap (stainless steel) with x Ø (0.0) holes Cable hanger, dimensions in mm (inch) More information Determination of the measuring range for medium water SITRANS LH00 pressure transmitter, dimensions in mm (inch) 86 (.9) (.0) 7 (.6) 7 (0.07) 98 (.86) 0 (.) H r Fastening hole Vent valve 6 (.) Cable gland Pg., cable diameter... 8 mm ( ) Junction box, dimensions in mm (inch) 7 (0.07) 0 (.) Calculation of the measuring range: p = x g x H with: = density of medium g = local acceleration due to gravity H = maximum level Example: Medium: Water, = 000 kg/m Acceleration due to gravity: 9.8 m/s Start-of-scale: 0 m Maximum level: 6.0 m Cable length: 0 m Calculation: p = 000 kg/m x 9.8 m/s x 6.0 m p = N/m p = 89 mbar Transmitter to be ordered: 7MF7-FA0 Plus, if required, junction box 7MF7-8AA and cable hanger 7MF7-8AB 6 Siemens FI 0 News January 07

Pressure Measurement. Transmitters for basic requirements SITRANS P MPS (submersible sensor) Transmitter for hydrostatic level 2/27

Pressure Measurement. Transmitters for basic requirements SITRANS P MPS (submersible sensor) Transmitter for hydrostatic level 2/27 Overview Siemens AG 011 Function s are for measuring the liquid levels in wells, tanks, channels and dams. Diaphragm p Sensor U const. U + (brown) I EM I -1 (blue) 0, U B s are submersible sensors for