Installation guide 862 MIT / MIR

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1 Installation guide 862 MIT / MIR in combination with: 864 MTT or 863 MRT or (dual) spot element November 2005 Part no _Rev3 Enraf BV PO Box AV Delft Netherlands Tel. : Fax : info@enraf.nl Website : Installation guide 862 MIT / MIR Page 1

2 Preface Preface This installation guide is intended for technicians involved in the mechanical and electrical installation of the Enraf Series 862. Multi element Interface Thermo sensor converter (862 MIT) Multi element Interface Resistance thermometer (862 MIR) This guide describes the installation of the two different models of the 862. The technician must have basic technical skills and knowledge of safety regulations and explosion proof equipment in hazardous areas. EC declaration of conformity Refer to the EC declaration of conformity, shipped with the instrument. Note: The connection to the instrument must be made with shielded cable. The shielding must be grounded in the cable gland on both ends of the cable. Legal aspects The mechanical and electrical installation shall only be carried out by trained personnel with knowledge of the requirements for installation of explosion proof equipment in hazardous areas. The information in this installation guide is the copyright property of Enraf BV, Netherlands. Enraf BV disclaims any responsibility for personal injury or damage to equipment caused by: Deviation from any of the prescribed procedures; Execution of activities that are not prescribed; Neglect of the general safety precautions for handling tools, use of electricity and microwave radiation. The contents, descriptions and specifications are subject to change without notice. Enraf BV accepts no responsibility for any errors that may appear in this installation guide. Additional information Please do not hesitate to contact Enraf or its representative if you require additional information. Page 2

3 Safety Safety Safety aspects of the 862 MIT / MIR The housing of the 862 MIT / MIR consists of a weather proof aluminium box IP65 acc. to IEC 529. The signals from the level gauge to the 862 MIT / MIR are: II 1/2 G EEx ib IIB T4, KEMA 03ATEX1475 X Class I, Division 1, Groups C and D acc. to ANSI/NFPA No. 70, certified by Factory Mutual Research USA The signals from the 862 MIT / MIR to the temperature element are: II 1/2 G EEx ia IIB T4, KEMA 03ATEX1475 X Class I, Division 1, Groups C and D acc. to ANSI/NFPA No. 70, certified by Factory Mutual Research USA The environmental conditions for the 862 MIT / MIR are: ambient temperature : -40 to 60 C (-40 to 140 F) relative humidity : 0-100% ingress protection : IP65 (NEMA 4), suitable for outdoor installation The 862 MIT / MIR is provided with a lightning protection at the output lines to the Enraf level gauge. Caution All wiring to the 862 MIT / MIR is intrinsically safe. The entire installation procedure, inclusive routing and grounding, shall be in accordance with national, local and company regulations. Warning Improper installation of cable glands, conduit or stopping plugs will invalidate the Ex approval of the 862 MIT / MIR. Installation guide 862 MIT / MIR Page 3

4 Safety Personal safety The technician must have basic technical skills to be able to safely install the equipment. When the 862 MIT / MIR is installed in a hazardous area, the technician must work in accordance with the (local) requirements for electrical equipment in hazardous areas. Warning In hazardous areas it is compulsory to use personal protection and safety gear such as: hard hat, fire-resistive overall, safety shoes, safety glasses and working gloves. Avoid possible generation of static electricity. Use non-sparking tools and explosion proof testers. Make sure no dangerous quantities of combustible gas mixtures are present in the working area. Never start working before the work permit has been signed by all parties. Pay attention to the kind of product in the tank. If any danger for health, wear a gas mask and take all necessary precautions. Safety conventions Warnings, Cautions and Notes have been used throughout this installation guide to bring special matters to the immediate attention of the reader. A Warning concerns danger to the safety of the technician or user; A Caution draws the attention to an action which may damage the equipment; A Note points out a statement deserving more emphasis than the general text, but not requiring a Warning or a Caution. Page 4

5 Mechanical installation Mechanical installation Caution The 862 MIT / MIR may be installed in hazardous areas. Before starting installation, check whether the actual area of installation complies with the area classification on the applicable approval certificate for your type of 862. Caution Make sure no dangerous quantities of combustible products are present in the working area. Note: The entire installation procedure shall be in accordance with national, local and company regulations. The 862 MIT / MIR can be mounted on top of the G ½ threaded pipe of the 864 MTT / 863 MRT or on a nearby rail. It is recommended to mount the 862 MIT / MIR directly on top of the 864 MTT / 863 MRT extension pipe. In the following sections is explained how to installed the 862 MIT / MIR: on the extension pipe the wall mounting and via a bracket on a rail Installation guide 862 MIT / MIR Page 5

6 Mechanical installation Installing the 862 MIT / MIR on top of 864 MTT / 863 MRT extension pipe Refer to figure 1. Place G ½ nut (4) and lock washer (3) on extension tube (5). Remove the cover from the 862 MIT / MIR housing by loosening the four screws (1). Feed the 864 MTT / 863 MRT wiring (2) through the G ½ entry. Turn the 862 MIT / MIR on the extension tube (5) of the 864 MTT / 863 MRT. Secure the 862 MIT / MIR by the G ½ nut (4). If the 864 MTT / 863 MRT wiring will be connected in a later stage, close the cover from the 862 MIT / MIR and seal cable inlet. Figure MIT / MIR installation on extension pipe 864 MTT / 863 MRT Page 6

7 Mechanical installation Installing the 862 MIT / MIR against the wall The 862 MIT / MIR unit can be installed against the wall or on a bracket. Refer to figure 1 and appendix A. The 862 MIT / MIR shall be mounted with the cable entries at bottom side. Remove the cover from the 862 MIT / MIR housing by loosening the four screws (1). Fix the 862 MIT / MIR with four screws of max 6 mm (¼") diameter. The screws are sunk for 20 mm (13/16") in the 862 MIT / MIR. If the 864 MTT / 863 MRT wiring will be connected in a later stage, close the cover from the 862 MIT / MIR and seal the cable inlets. Installing the 862 MIT / MIR on a rail Determine whether the 862 MIT / MIR unit is to be installed on a horizontal rail or on a vertical rail. As the 862 MIT / MIR shall be mounted with the cable entries at bottom side, the mounting plate must be installed as indicated in figure 2. Figure 2 Bracket position on horizontal rail and vertical rail Remove the cover from the 862 MIT / MIR housing by loosening the four screws (1). Fix the mounting plate to the 862 MIT / MIR as indicated in figure 2. Make use of the four screws M6 x 30 mm, nuts M6 and lock washers M6. Place mounting plate with 862 MIT / MIR on rail and secure mounting plate with the two U-bend brackets. Note: Check with a vertical rail, if the legs of the lower U-bend bracket do not interfere with the cable inlets of the 862 MIT / MIR. If so, then cut the remaining part. If the 864 MTT / 863 MRT wiring will be connected in a later stage, close the cover from the 862 MIT / MIR and seal the cable inlets. Installation guide 862 MIT / MIR Page 7

8 Electrical installation Electrical installation The entire electrical installation shall be in accordance with International Standard IEC for electrical equipment in hazardous areas. Warning Make sure that all power to associated instrument is switched off before opening the cover of the 862. Failure to do so may cause danger to persons or damage the equipment. The cover of the 862 MIT / MIR must be closed before switching on the power. Caution Make sure that no dangerous quantities of combustible products are present in the working area. Grounding Proper grounding of 862 MIT / MIR to tank is required. Use external ground terminal on 862 housing (refer to figure 1). Caution Safety depends on proper grounding. Check the resistance of the ground connection directly after installation. The measured ground resistance shall be below the maximum prescribed by local grounding requirements. Warning When measuring the ground resistance, use a suitable explosion-proof tester. Note: Grounding shall be performed in accordance with local regulations. Page 8

9 Electrical installation Supply / transmission The combined supply / transmission for the 862 MIT / MIR comes from one of the option boards MPU, HPU or OPU. These boards can be installed in various Enraf instruments such as the 854 level gauge, the 873 SmartRadar and the 877 FDI field indicator. The power rating is: 15 Vdc nominal; current varying between ma. The connection between 862 MIT / MIR and supply board is intrinsically safe. Local and company requirements must be followed for the routing of the i.s. wiring. Cable specifications The cable length between 862 MIT / MIR and associated instrument (with the MPU, HPU or OPU board) should be kept as short as possible. The cable requirements are: twisted pair and shielded R max : 25 Ω / line C max : 470 nf L max : 0.65 mh C max and L max may vary depending the values mentioned in the i.s. approval. The correct values are indicated on the identification label of the instrument, in the installation guide of the associated instrument, or can be found in the approval certificate. Caution Wiring to and from the 862 MIT / MIR shall be protected against EMC influences. Note: It is required to use metallic cable glands to provide good contact between cable shield and 862 MIT / MIR housing. The screen of the cable should be connected inside the cable gland. Shielding: Note: Never connect the shielding inside the 862 MIT / MIR housing. Shielding must be connected externally to the housings of the 862 MIT / MIR and associated instrument, or in the cable gland. The shielding must be connected to ground at both sides of the cable. Installation guide 862 MIT / MIR Page 9

10 Electrical installation Connecting the supply / transmission wiring: If the cover from the 862 MIT / MIR housing is closed, removed it by loosening the four screws in each corner. Feed the supply / transmission cable into the right hand side cable entry. Connect the + and - wires as indicated in figure 3 (862 MIT) or in figure 4 (862 MIR). Element wiring Keep the distance between 862 MIT / MIR and temperature element as short as possible. If the 862 is used to interface an average temperature element as the Enraf multi thermo sensor thermometer type 864 MTT (862 MIT) or a multiple resistance thermometer 863 MRT (862 MIR) install the 862 MIT / MIR directly on top of the element. Note: The 864 MTT has single wires, therefore shrink wire pins cannot be used. The screw terminals are designed for direct connection of the single wires. Caution If the 862 MIT / MIR cannot be placed directly on top of the temperature element, the element wiring shall be protected by a suitable EMC shielding (flexible) conduit. The wiring connections for the 864 MTT is given in figure 3 The wiring connections for the 863 MRT and spot elements are given in figures 4 to 8. After all connections have been made, close the cover of the 862 MIT / MIR with the four screws at each corner. Page 10

11 Electrical installation Connecting the 862 MIT Figure MIT connection diagram Note: Before connecting the MTT wiring, ground the 862 MIT housing to the external grounding connection. When connecting the MTT wiring, first connect the wires on connector CN1, terminals (one brown wire and two red wires). Insert the female connector CN1 into the male connector on the 862 MIT. Then continue with connecting the other MTT wiring. Installation guide 862 MIT / MIR Page 11

12 Electrical installation Connecting the temperature element to the 862 MIR Use the correct connection diagram depending on the type of temperature element. Use fig. 4 for Use fig. 5 for Use fig. 6 for Use fig. 7 for Use fig. 8 for 863 MRT with spot element; 863 MRT without spot element. 863 MRT with spot element and one separate spot element for the vapour phase. spot element (connect spot element as was it an 863 MRT with only one element). two spot elements (one spot element for product temperature and one spot element for vapour phase temperature). All not used inputs should be connected to ground (CN4-16). For details see the connection diagrams. Figure MRT with spot element connected to 862 MIR Page 12

13 Electrical installation Figure MRT without spot element connected to 862 MIR Figure MRT with spot element and one separate vapour phase spot Installation guide 862 MIT / MIR Page 13

14 Electrical installation Figure 8 Two spot elements connected to 862 MIR Figure 7 One spot element connected to 862 MIR Page 14

15 Appendix Appendix A Dimensional drawings 862 MIT / MIR Installation guide 862 MIT / MIR Page 15

16 Appendix 862 MIT / MIR with bracket Page 16

17 Appendix Appendix B ATEX approval The 862 MIR and 862 MIT have been ATEX approved as intrinsically safe. The maximum values according to the ATEX certificate are: Input circuit EEx ib IIB: 862 MIR (terminals CN5/1-4) and 862 MIT (terminals CN6/1-4): V o = 23.3 V I k = 270 ma P = 1.3 W C i = negligible L i = 1.55 mh Measuring circuit EEx ia IIB: 862 MIR (terminals CN1-CN4) and 862 MIT (terminals CN1-CN5): V o = 18.4 V I k = 33 ma P = 75 mw C max = 470 nf L max = 5 mh Installation guide 862 MIT / MIR Page 17

18 Appendix Appendix C Related publications Installation guide 863 MRT Installation guide 864 MTT Installation guide 854 Advanced Technology Gauge Installation guide 854 XTG Servo Gauge Installation guide 877 FDI Installation guide 873 SmartRadar Control Unit Instruction manual 862 MIR Instruction manual 862 MIT Page 18

19 Notes Installation guide 862 MIT / MIR Page 19

20 Page 20

Physikalisch-Technische Bundesanstalt

Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (13) S C H E D U L E (14) EC-TYPE-EXAMINATION CERTIFICATE PTB 99 ATEX 2139 X (15) Description of equipment The TH-series measuring transducers