Discrete Input Wiring Connections - Hach Polymetron 9500 User Manual

Potential electrocution hazard. In order to maintain the NEMA/IP environmental ratings of the enclosure, use only
conduit fittings and cable glands rated for at least NEMA 4X/IP66 to route cables in to the instrument.
Two isolated analog outputs are provided. Such outputs are commonly used for analog signaling or
to control other external devices. Make wiring connections to the controller as shown in
Table 3.
Note: Figure 8 shows the back of the controller cover and not the inside of the main controller compartment.
Figure 8 Analog output connections
Recorder wires
Output 2-
Output 2+
Output 1-
Output 1+
1. Open the controller cover.
2. Feed the wires through the cable gland.
3. Adjust the wire as necessary and tighten the cable gland.
4. Make connections with twisted-pair shielded wire and connect the shield at the controlled
component end or at the control loop end.
• Do not connect the shield at both ends of the cable.
• Use of non-shielded cable may result in radio frequency emission or susceptibility levels higher
than allowed.
• Maximum loop resistance is 500 ohm.
5. Close the controller cover and tighten the cover screws.
6. Configure outputs in the controller.

Discrete input wiring connections

Potential Electrocution Hazard. Always disconnect power to the instrument when making electrical connections.
W A R N I N G
Table 3 Output connections
W A R N I N G
Circuit board position
4
3
2
1
Figure 8 and
English 17