<2. WIRING AND INSTALLATION>
2-19
IM 12A01F01-02EN 2nd Edition : Feb. 19, 2019-00
n ORP Measurement
The ORP measurement uses the same sensor input module as the pH measurement. It is not
uncommon to measure ORP as process variable and a pH Glass electrode as reference. This is
the case with rH measurement and with pH compensated ORP measurement.
Conventional ORP sensors are connected to the module as follows:
11 Temperature
12 Temperature
13 Reference
14 Solution ground
15 Metal (measure)
16 Shield
17 Shield
FLXA402
REFTC Liquid
Earth
ORP
For conventional ORP sensors, the jumpers are placed as illustrated:
Input 2 Input 1
Metal sensor on Input 1
Normal reference on Input 2.
pH Compensated ORP sensors are connected to the module as follows:
11 Temperature
12 Temperature
13 Glass
14 Solution ground
15 Metal
16 Shield
17 Shield
FLXA402
PHTC ORPLiquid
Earth
For pH Compensated ORP sensors, the jumper is placed as illustrated:
Input 2
Metal sensor on Input 1
pH glass (as reference) on Input 2
Input 1
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