Hach-Lange POLYMETRON 9586 - Manual (Page 22)

Cleaning and decontamination
D A N G E R
Always remove power from the controller before performing maintenance activities.
The analyzer does not normally require any cleaning or decontamination. If needed, clean the
exterior of the instrument with a moist cloth and a mild soap solution. Never use cleaning agents
such as turpentine, acetone or similar products to clean the instrument, including the display and any
accessories.
Troubleshooting
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 oxygen scavenger sensors
Warning Description Resolution
O2 SCAVENGER TOO
HIGH The measured value is >
10000 ppm Make sure that the oxygen scavenger
(hydrazine or carbohydrazide) level in the
process water is within the operating limits of
the sensor. Calibrate or replace the sensor.
O2 SCAVENGER TOO LOW The measured value is < 0 ppm Calibrate or replace the sensor.
TEMP TOO HIGH The measured temperature is >
50 °C Reduce sample temperature.
TEMP TOO LOW The measured temperature is <
0 °C Increase sample temperature.
CURRENT TOO HIGH The measured current > 200 mA Make sure that the oxygen scavenger
(hydrazine or carbohydrazide) level in the
process water is within the operating limits of
the sensor. Calibrate or replace the sensor.
CURRENT TOO LOW The measured current < -0.5 mA Calibrate or replace the sensor.
CAL OVERDUE The Cal Reminder time has
expired Calibrate the sensor.
REPLACE SENSOR The sensor has been in
operation > 365 days Replace the sensor cartridge and calibrate the
sensor. If the calibration result is pass, reset
the membrane days in the DIAG/TEST menu.
NOT CALIBRATED The sensor has not been
calibrated Calibrate the sensor.
CAL IN PROGRESS A calibration was started but not
completed Return to calibration.
Replacement parts and accessories
Refer to the replacement parts and accessories section of the controller documentation for controller
parts and accessories.
22 English