Hach-Lange POLYMETRON 9586 - Manual (Page 33)

Table 6 Controller (continued)
Problem Resolution
Controller will not power up, or powers up
intermittently
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
Network or sensor module not recognized
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.
Sensor not recognized
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
Device Missing error message appears
Perform a Device Scan from the Test/Maintenance menu.
Power cycle the controller
Table 7 Measurement
Problem Probable cause Resolution
pH < 10.5
The bottle of conditioning solution is empty.
Replace the bottle of conditioning solution.
The concentration of the conditioning
solution is too low.
Poor conditioning due to fouling of the
venturi injection nozzle. Unscrew the venturi injection nozzle and
clean with compressed air.
The signal is
decreasing.
Fouling of the platinum electrode.
Carefully clean the surface of the electrode
with a soft and absorbent tissue. Calibrate
the instrument.
Lack of accuracy.
The potential between the reference
electrode and the platinum electrode is >
480 mV.
Change the reference electrode.
Measurement
instability.
Unstable sample flow rate.
Calibrate the instrument with the same flow
rate as the measurement flow rate.
Liquid leaking from
the top of the flow
chamber.
Sample output not draining correctly.
Verify the atmospheric pressure drainage.
Check there are no blockages or kinks in
the tubing.
Test and maintenance menu
1. Push the menu key and select TEST/MAINT.
Option Description
SCAN DEVICES Performs a scan for active and missing devices.
English 31