Hach Polymetron 9523sc pH Basic User Manual page 11

Figure 4 Wiring connections overview
1 Service cable connection
2
2 4-20 mA output
3 Sensor module connector
4 Communication module
connector (e.g., Modbus,
Profibus, HART, optional
4-20 mA module, etc.)
High-voltage barrier
High-voltage wiring for the controller is located behind the high-voltage barrier in the controller
enclosure. The barrier must remain in place except when installing modules or when a qualified
installation technician is wiring for power, alarms, outputs or relays. Do not remove the barrier while
power is applied to the controller.
Wiring for power
Potential Electrocution Hazard. Always disconnect power to the instrument when making electrical
connections.
Potential Electrocution Hazard. If this equipment is used outdoors or in potentially wet locations, a
Ground Fault Interrupt device must be used for connecting the equipment to its mains power source.
2
Terminals can be removed for improved access.
5 AC and DC power connector
6 Ground terminals
2
7 Relay connections
8 Digital sensor connector
W A R N I N G
W A R N I N G
2
9 Discrete input wiring connector
10 Digital sensor connector
2
2
2
English 11