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BLOWDOWN TIMEOUT
This error condition will stop conductivity control. It is caused by the bleed output being activated for longer than the programmed Blowdown
Time Limit.
Possible Cause
Corrective Action
Programmed value too low for normal conditions.
Increase Blowdown Time Limit.
Blowdown flow rate too low.
Check for clogged strainer.
Check for insufficient pressure differential.
Blowdown valve not opening.
Check for faulty blowdown valve.
Check blowdown valve wiring.
Check controller relay.
NO FLOW
This error message will appear if the flow/no flow switch closure is opened. The error message will be displayed and the alarm relay will trip. The
conductivity is updated but all outputs are deactivated.
Possible Cause
Corrective Action
No flow
Check recirculating pump, valves, etc.
Faulty flow switch/cable
Check for open circuit. Disconnect flow switch and short the input
with a piece of wire. If "no flow" message disappears, then switch or
cable may be faulty.
Insufficient pressure drop through sample stream
Check piping.
CAL FAIL
The controller allows a maximum of ±50% correction to the conductivity reading. This is a cumulative correction factor which means that if at one
time the electrode is calibrated by 30%, the next time it is calibrated it will only accept an adjustment of +20% before reporting a Cal Fail.
The most likely problem is that the electrode needs to be cleaned. Refer to section 6.1.
7.2
Conductivity Readout Does Not Change
If the readout is stuck at or near zero:
Possible Cause
Correction Action
Dry electrode
Check for flow through system.
Electrode is disconnected.
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.
If the readout is stuck at another number:
Dirty or faulty electrode
Evaluate electrode (see Section 7.3).
Stagnant sample
Check system for proper flow.
