Hach Polymetron 9 82 Series, Руководство пользователя, Страница: 21 / 28

Problem Probable cause Resolution
The sensor current
is negative.
Connection problem to the anode circuit
(loose contact).
Check the connection to the controller
module. If correct check the connections to
the sensor cable connector.
There is a dark green deposit of silver
bromide (AgBr) on the surface of the silver
tube.
Polish the tube with a soft abrasive (N°
400 to 600).
The sample
temperature is out of
specification.
There may be a short-circuit on the
temperature connection.
Check the connection to the controller
module. If correct check the connections to
the sensor cable connector.
The displayed
reading is not
numeric.
The measured value is < 0 ppb if negative
signs are displayed.
Check the zero calibration.
The measured value is > 10,000 ppb Change the display unit.
The standby function is enabled because
the measured value is > 2 ppm. Exit the standby function from the menu
option.
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.
Table 2 Sensor DIAG/TEST menu
Option Description
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 Shows the number of days since the last calibration.
CAL HISTORY Shows a list of the calibrations and the details for each calibration.
RESET CAL HISTORY Service use only. Resets the calibration history for the sensor. All previous calibration
data is lost.
SENSOR SIGNALS Shows the current reading in mV and the temperature.
MEMBRANE DAYS Shows the number of days that the sensor has been in operation.
RESET MEMBRANE Resets the number of days that the sensor has been in operation.
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.
English 19