39
WIKA operating instructions pressure transmitter, model IS-3
EN
14243628.02 10/2018 EN/DE
6.3 Electrical mounting
1.
Use and assemble connection cable that is suitable for the application. The specifications of the individual electrical
connections are found in the following table, “Specifications of electrical connections”.
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For cables with flexible wires, always use ferrules appropriate for the wire cross-section.
■
Select a cable diameter that matches the cable bushing of the connector. Make sure that the cable gland of the
mounted plug has a tight fit and that the seals are present and undamaged. Tighten the threaded connection and
check that the seals are correctly seated.
WARNING!
Danger to life through improper mounting
If the pressure transmitter is not mounted properly, the explosion protection can no longer be
ensured.
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Fine-stranded leads with bare ends must be finished with end splices (cable preparation)
2.
Ground the case via the process connection to protect the pressure transmitter against electromagnetic fields and
electrostatic discharge. Include the case in the equipotential bonding of the application.
3. Setting up an intrinsically safe voltage supply.
■
For ATEX/IECEx ignition protection type Ex i
- Power the pressure transmitter via an intrinsically safe circuit (Ex ia). Both the internal capacitance and induc-
tance must be considered, see chapter 3 “Specifications”. With a certified repeater power supply (e.g. model
IS Barrier) or a certified Zener barrier, the isolation of the voltage and current supply between Ex and non-Ex
areas, which is an absolute requirement, can be realised.
- For applications that require EPL Gb or Db, the power supply and signal circuit should have a protection level
of “ib”. Then the interconnections and thus the pressure transmitter will have a protection level of II 2G Ex ib IIC
T4/T5/T6 Gb or II 2D Ex ib IIIC T4/T5/T6 Db, although the pressure transmitter is marked otherwise (see EN
60079-14 section 5.4).
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For ATEX/IECEx ignition protection types Ex nA and Ex tc
Connect the pressure transmitter with marking “Ex nA IIC T4/T5/T6” to a power and signal circuit with transient
protection in accordance with IEC 60079-15:2010, chapter 13 c).
6. Commissioning, operation
Содержание IS-3
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