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Input and Output Wiring
7/99 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual
6-5
Table 6-2 Procedure for Installing Analog I/O Wiring
Step Action
1
Go to I/O SETUP to view the displays showing analog input, relay, and analog output use.
Note the assignments shown. You must wire the unit to match these assignments in order
for the unit to work as expected. (See Section 5.)
2 Turn off the power to the Analyzer/Controller. More than one switch may be required
to remove power.
3 With the power off, open the case:
•
Grasp the bottom center portion of the front bezel and pull it downward and toward you
slightly to disengage the bottom of the bezel from the edge of the case.
•
Lift the bezel gently to disengage it from the top edge of the case.
•
Swing the bezel to the left. (The bezel and display assembly is mounted on pivot arms.)
The safety cover with its warning label will be visible.
4 With the power off remove the safety cover by removing the single screw holding it in
place.
5
Connect the inputs from the cells to the terminals in accordance with the system setup
assignments. Refer to the wiring diagram provided with the cells and to Figure 6-1*.
* There are 2 resistors, one for cell 2 input and one for cell 2 thermistor input, which are installed in every unit at
the factory. These resistors are required if only cell 1 input is being utilized. If cell 2 input is being utilized, remove
these resistors from the unit. These resistors can be saved and used as Precision Check Resistors. See
Appendix D for details.
6
If analog outputs are to be used, connect the outputs from the Analyzer/Controller terminals
in accordance with the system setup assignments. Refer to the wiring diagrams provided
with the field devices receiving the signals and to Figures 6-1.
7
If the relay outputs are to be used, leave the unit open and powered down. See 6.4.
8
If the relays will not be used, replace the safety cover and secure it with the screw.
9 Close the case and power up the unit. Do not apply power with the case open.