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Problem
Probable cause
Connection problem to the anode circuit
(loose contact).
The sensor current
is negative.
There is a dark green deposit of silver
bromide (AgBr) on the surface of the silver
tube.
The sample
There may be a short-circuit on the
temperature is out of
temperature connection.
specification.
The measured value is < 0 ppb if negative
signs are displayed.
The displayed
reading is not
The measured value is > 10,000 ppb
numeric.
The standby function is enabled because
the measured value is > 2 ppm.
9.2 Sensor diagnostic and test menu
The sensor diagnostic and test menu shows current and historical information about the instrument.
Refer to
Table
2. To access the sensor diagnostic and test menu, push the MENU key and select
Sensor Setup, [Select Sensor], DIAG/TEST.
Option
MODULE INFORMATION Shows the version and the serial number for the sensor module.
SENSOR INFORMATION Shows the name and serial number that was entered by the user.
CAL DAYS
CAL HISTORY
RESET CAL HISTORY
SENSOR SIGNALS
MEMBRANE DAYS
RESET MEMBRANE
9.3 Warning and error conditions
Follow the steps below to acknowledge controller warnings.
1. Push the menu key and select DIAGNOSTICS.
2. Select the device (controller, sensor, network card) with the warning or error and push enter.
3. Select the warning, error or event list and push enter.
4. Select YES and push enter to acknowledge the warning.
Note: Errors cannot be acknowledged.
9.3.1 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.
Table 2 Sensor DIAG/TEST menu
Description
Shows the number of days since the last calibration.
Shows a list of the calibrations and the details for each calibration.
Service use only. Resets the calibration history for the sensor. All previous calibration
data is lost.
Shows the current reading in mV and the temperature.
Shows the number of days that the sensor has been in operation.
Resets the number of days that the sensor has been in operation.
Resolution
Check the connection to the controller
module. If correct check the connections to
the sensor cable connector.
Polish the tube with a soft abrasive (N°
400 to 600).
Check the connection to the controller
module. If correct check the connections to
the sensor cable connector.
Check the zero calibration.
Change the display unit.
Exit the standby function from the menu
option.
English 19
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