YOKOGAWA FLXA402 - Wiring the Ph;Orp Sensor

<2. WIRING AND INSTALLATION>
2-18
IM 12A01F01-02EN 2nd Edition : Feb. 19, 2019-00
2.6.1 Wiring the pH/ORP sensor
n pH Measurement
Conventional pH sensors are connected to the module as follows:
11 Temperature
12 Temperature
13 Reference
14 Solution ground
15 Glass (measure)
16 Shield
17 Shield
FLXA402
REFTC PHLiquid
Earth
In addition to the wiring of the sensor, insure that a jumper for low-impedance sensor inputs
is installed. Two jumpers are supplied with each module. Keep unused jumpers in the jumper
holder to avoid losing them.
• pH Glass Electrode is a high impedance sensor input
• Standard reference electrodes and an ORP/REDOX electrode are low impedance sensor
inputs
• Special electrodes using 2 glass sensors (example: Pfaudler, SC24V) do not need jumpers.
Terminals 15-19 are identied as input 1 (High Impedance) and terminals 13-18 are dened as
input 2 (Low Impedance). For conventional pH sensors, the jumper is placed as illustrated:
Input 2
Glass sensor on Input 1
Reference sensor on Input 2
Input 1
Store jumpers that you do not use in the jumper holder.