Hach-Lange POLYMETRON 9500 Ultrapure pH_ORP Module User Manual - Manual (Page 16)

Table 3 Sensor DIAG/TEST menu (continued)
Option Description
POLARIZATION Contacting conductivity sensors only. Shows
information about the electrode polarization, the cable
capacitance and the time before the next
measurement.
IMPED STATUS For pH sensors only—Enable or disable impedance
measurements.
SENSOR SIGNALS Shows the current sensor signal information.
SENSOR DAYS Shows the number of days that the sensor has been in
operation.
RESET SENSOR Resets the number of days that the sensor has been in
operation and resets all calibration data to defaults.
Error list
Errors may occur for various reasons. An error icon consists of an exclamation point within a circle.
When an error occurs, the error icon and the measurement screen flash alternately in the main
display. All outputs are held when specified in the controller menu. To view errors, push the menu
key and select DIAGNOSTICS. Then select the device to view any problems associated with that
device.
A list of possible errors is shown in
Table 4 .
Table 4 Error list for pH and ORP sensors
Error Description Resolution
ADC FAILURE The analog to digital conversion
failed Power off and power on the
controller. Call technical support.
SAME BUFFER The buffers for 2 point buffer
calibration have the same value Make sure the two buffers used for
calibration are different.
SENSOR MISSING The sensor is missing or
disconnected Examine the wiring and connections
for the sensor and for the module.
TEMP MISSING The temperature sensor is missing Examine the wiring for the
temperature sensor. Make sure that
the correct temperature element is
selected.
GLASS IMP LOW The glass bulb is broken or reached
end of life Replace the sensor. Call technical
support.
Warning list
A warning icon consists of an exclamation point within a triangle. Warning icons appear on the right
of the main display below the measurement value. A warning does not affect the operation of menus,
relays and outputs. To view warnings, push the menu key and select DIAGNOSTICS. Then select
the device to view any problems associated with that device. The warning icon will no longer be
displayed once the problem has been corrected or acknowledged.
A list of possible warnings is shown in
Table 5 .
Table 5 Warning list for pH and ORP sensors
Warning Description Resolution
PH TOO HIGH The measured pH is > 14 Calibrate or replace the sensor.
ORP TOO HIGH The measured ORP value is >
2100 mV
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