Connector J8 (sensor)
The numbers listed below refer to the 10 available J8 connections (from left to right) in Figure 15.
The colors indicated are the wire colors in the sensor cable.
Note: Remember, this connector is colored orange for EC sensors and black for TC sensors.
A1100 EC sensor 31xxx EC sensor 31xxxS smart EC
sensor
TC sensor Sensor
cable
1. Guard electrode Guard electrode Guard electrode GND for power Yellow
2. RS485A+ Not used I2C-SCL V2 signal Pink
3. Thermistor A Thermistor A Thermistor A Solenoid Grey
4. Anode electrode Anode electrode Anode electrode Relay coil Red
5. RS485B Not used I2C-SDA +12V power Purple
6. Thermistor B Thermistor B Thermistor B +24V power White
7. GND Not used GND V3 signal Black
8. + 5V Not used + 5V GND for signal Green
9. Cathode electrode Cathode electrode Cathode electrode -5V power Blue
10. Not used Not used Not used Temperature Brown
4.7.5 Measurement alarm relays
The three output relays are located on the measurement board.
They can be individually configured to Normally Open (NO) or to Normally Closed (NC) by
physically moving the jumper on each relay. The illustration is for the EC measurement
board (the positions are different for the TC measurement board):
• Upper relay is set to NC
• Middle relay is set to NO
• Lower relay is shown with no jumper
Note: For all measurement boards, J4 is relay 1, J5 is relay 2 and J6 is relay 3
4.8 Sensor installation
4.8.1 EC sensors
For EC sensor installation, servicing, and maintenance ensure you follow the instructions in the
Sensor Installation and Maintenance manual that was supplied with the instrument.
4.8.2 TC sensors
For TC sensor installation, servicing and maintenance ensure you follow the instructions in the TC
Sensor Installation and Maintenance manual that was supplied with the instrument. Pay particular
attention to the installation and connection of the purge gas supply.
N O T I C E
Do not place the TC sensor into a liquid sample until a constant supply of dry purge gas has been connected, as
liquid could condense inside the measuring chamber and cause damage to the thermal conductor chip.
To ensure the continuation of purge gas while the sensor is in contact with the sample, it is highly
recommended to use a backup purge gas cylinder with an automatic changeover valve that activates
when the first cylinder is empty.
The use of an ORBISPHERE Model 29089 gas regulator (or similar) is also recommended to deliver
a constant, pressure regulated supply of dry purge gas to the sensor, filtered to 40 μm.
English
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