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7.2
Conductivity Readout Does Not Change
If the readout is stuck at or near zero:
Possible Cause
1. Dry electrode
2. Electrode is disconnected.
If the readout is stuck at another number:
Possible Causes
1. Dirty or faulty electrode
2. Stagnant sample
7.3
Procedure for Evaluation of Conductivity Electrode
Can be used for troubleshooting a sensor error message, low conductivity, high conductivity, conductivity
stuck at 0, cal failure, and/or conductivity stuck at a number other than 0.
Try cleaning the electrode first (refer to Sect. 6.1).
To find out if the electrode or the controller is faulty, step through the Self-Test menu, as described in
section 5.2. The display should read 1000 ± 100μS/cm. This indicates that the controller is OK and the
problem is in the probe or its connections. If it does not read 1000 ± 100 µS/cm, return the control module
for repair.
To check the electrode, check the electrode connections to the terminal strip (refer to Figure 3). Make sure
that the correct colors go to the correct terminals, and that the connections are tight. Restore power and
see if the conductivity is back to normal. If not, replace the electrode.
7.4
Procedure for Checking Relay Outputs
If any pre-wired output is not activating the device (pump, valve, etc.) attached to it:
Verify that the pump or valve is not faulty by plugging it directly into a wall socket.
In some controllers, certain relays are NOT internally powered. Check the instruction manual to determine
if the relay is a dry contact type. If so, make sure that external power (115 VAC) has been connected to
the relay. In most cases, this will be a jumper wire from the large screw labeled "HOT" to one of the relay
terminals.
Manually activate the relay using the hand-off-auto menu. Verify that the LED on the front panel lights
up. If the device turns on, there must be a problem with the set points if the device doesn't turn on when it
should.
With power removed, check the wiring of the pigtail to the terminal strips. Make sure that they are not
loose, that they are not connected by the wire's jacket, and that they are connected to the correct terminal.
Also check the removable terminal block where the black (hot) wires attach (TB2) to see if it has pulled
loose. Restore power and manually activate the relay.
Corrective Action
Check for flow through system.
Check wiring to electrode. Go to self-test menu, as
described in section 5.2 If readout changes to 900-
1100, the problem is with electrode or connections.
(see section 7.3) If still at zero, problem is with
controller. Consult the factory.
Corrective Action
Evaluate electrode (see Section 7.3).
Check system for proper flow.
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