Hach Polymetron 9500 Manuel D'utilisation Simplifié page 17

Potential electrocution hazard. AC mains powered controllers (115 V–230 V) are designed for relay
connections to AC mains circuits (i.e. voltages greater than 16 V-RMS, 22.6 V-PEAK or 35 VDC).
The wiring compartment is not designed for voltage connections in excess of 250 VAC.
24 VDC powered controllers
Potential electrocution hazard. 24 V powered controllers are designed for relay connections to low
voltage circuits (i.e. voltages less than 16 V-RMS, 22.6 V-PEAK or 35 VDC).
The 24 VDC controller relays are designed for connection to LOW voltage circuits (i.e., voltages less
than 30 V-RMS, 42.2 V-PEAK or 60 VDC). The wiring compartment is not designed for voltage
connections above these levels.
The relay connector accepts 18-12 AWG wire (as determined by load application). Wire gauge less
than 18 AWG is not recommended.
The Normally Open (NO) and Common (COM) relay contacts will be connected when an alarm or
other condition is active. The Normally Closed (NC) and Common relay contacts will be connected
when an alarm or other condition is inactive (unless the Fail Safe is set to Yes) or when power is
removed from the controller.
Most relay connections use either the NO and COM terminals or the NC and COM terminals. The
numbered installation steps show connection to the NO and COM terminals.
W A R N I N G
W A R N I N G
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