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Problem
Controller will not power up, or powers up
intermittently
Network or sensor module not recognized
Sensor not recognized
Device Missing error message appears
Problem
Probable cause
The bottle of conditioning solution is empty.
The concentration of the conditioning
pH < 10.5
solution is too low.
Poor conditioning due to fouling of the
venturi injection nozzle.
The signal is
Fouling of the platinum electrode.
decreasing.
The potential between the reference
Lack of accuracy.
electrode and the platinum electrode is >
480 mV.
Measurement
Unstable sample flow rate.
instability.
Liquid leaking from
the top of the flow
Sample output not draining correctly.
chamber.
Test and maintenance menu
1. Push the menu key and select TEST/MAINT.
Option
SCAN DEVICES
Table 6 Controller (continued)
Resolution
Make sure the AC power connections are properly terminated in
the controller.
Make sure the power strip, line power, wall plug are all properly
plugged in.
Contact Technical Support
Make sure the module is properly installed.
Make sure the module selector switch is set to the proper
number.
Remove sensor module and install the module into the second
analog slot. Apply power to the controller and allow the controller
to perform a device scan.
Contact Technical Support.
If the sensor and a corresponding module is installed in the
controller, refer to the instructions supplied with the Network or
Sensor Module.
Contact Technical Support
Perform a Device Scan from the Test/Maintenance menu.
Power cycle the controller
Table 7 Measurement
Description
Performs a scan for active and missing devices.
Resolution
Replace the bottle of conditioning solution.
Unscrew the venturi injection nozzle and
clean with compressed air.
Carefully clean the surface of the electrode
with a soft and absorbent tissue. Calibrate
the instrument.
Change the reference electrode.
Calibrate the instrument with the same flow
rate as the measurement flow rate.
Verify the atmospheric pressure drainage.
Check there are no blockages or kinks in
the tubing.
English 31
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