IM-P693-13 EMM Issue 2
8
CP42 Conductivity Probe
Cabling should be installed in accordance with BS 6739 - Instrumentation in Process Control Systems :
Installation design and practice or local equivalent. For US and Canadian installations the probe must be
wired in accordance with the National and Local Electrical Code (NEC) or the Canadian Electrical Code
(CEC). An 8-way terminal block is provided in the terminal head to simplify wiring. The terminal block accepts
wires with conductor cross section of 0.01 - 1.31 mm2 (28 - 16 AWG).
See controller IMI for further wiring details.
For US and Canadian installations, Class 1 screened cable with a suitable temperature rating (75 °C/167 °F
minimum) must be used for the wiring.
Connect the wiring and screens as shown in the diagrams below.
Caution: Do not connect any wires to the smaller (five-way) terminal block, as it houses the very
fine wiring from the probe which could be easily damaged in attempting to connect additional wires.
Wiring should be carried out using 5 core, 0,5 mm² (20 AWG), high temperature screened cable, with a
maximum length of: 10 m for 0 – 10 µS/cm and 30 m for 10 - 10000 µS/cm. For example, LiYCY 5 x 0,5mm²
Fig. 3 Wiring layout
4. Wiring diagrams
TBK2 TBK1
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