Hach CD300 User Manual page 17

Use the relay connections to start or stop an external device such as an alarm. Use wire that is rated
for 300 V. Use a minimum wire gauge of 18 AWG. Make sure to obey the relay connection
requirements in Specifications
power from the relays locally if there is an emergency or for maintenance.
1. Remove the power to the instrument.
2. Open the controller cover. Refer to
3. Put the cable through the relay strain relief fitting. Refer to
the steps in Figure 6
4. Tighten the strain relief fitting.
5. Close the controller cover.
Figure 6 Relay connection
Pin
1
2
3
Connect the analog outputs and the external trigger
Electrocution hazard. Remove power from the instrument before this procedure is started.
on page 3. Make sure to have a second switch available to remove
Open the controller cover
and Table 6.
Table 6 Relay wiring information CON3
Connection
NC
CO
NO
D A N G E R
on page 10.
Product overview on page 6. Complete
Description
Normally closed
Changeover
Normally open
English 17