Hach D5500 Série Manuel De L'utilisateur page 17

Table 5 Error list for dissolved oxygen sensors (continued)
Error Description
TEMP TOO LOW The measured
temperature is < 0 °C
ADC FAILURE The analog to digital
conversion failed
MEM PUNCTURED The sensor membrane is
damaged
REGEN NEEDED The sensor membrane
needs to be cleaned
Warning list for sensors
A warning does not affect the operation of menus, relays and outputs. A
warning icon flashes and a message is shown on the bottom of the
measurement screen. To show the sensor warnings, press the MENU key
and select Sensor Diag, [Select Sensor], Warning List. A list of possible
warnings is shown in Table 6.
Table 6 Warning list for dissolved oxygen sensors
Warning Description
DO TOO HIGH The measured value is >
45 ppm
DO TOO LOW The measured value is <
0 ppm
%SAT TOO HIGH The percent saturation is
> 200%
%SAT TOO LOW The percent saturation is
< 0%
Resolution
Temperature lower than limit
Power off and power on the
controller. Call technical
support.
Replace the sensor cartridge.
Clean and calibrate the sensor.
Resolution
Make sure that the DO level in
the process water is within the
operating limits of the sensor.
Calibrate or replace the
sensor.
Calibrate or replace the
sensor.
Make sure that the DO level in
the process water is within the
operating limits of the sensor.
Calibrate or replace the
sensor.
Calibrate or replace the
sensor.
Table 6 Warning list for dissolved oxygen sensors (continued)
Warning Description
TEMP TOO HIGH The measured
temperature is > 50 °C
TEMP TOO LOW The measured
temperature is < 0 °C
CAL OVERDUE The Cal Reminder time
has expired
REPLACE SENSOR The sensor has been in
operation > 365 days
NOT CALIBRATED The sensor has not been
calibrated
FLASH FAILURE External flash memory
failed
CAL IN PROGRESS A calibration was started
but not completed
Event list for sensors
The event list shows current activities such as configuration changes,
alarms, warning conditions, etc. To show the events, press the MENU key
and select Sensor Diag, [Select Sensor], Event List. A list of possible
events is shown in Table 7. Previous events are recorded in the event log,
which can be downloaded from the controller.
Table 7 Event list for dissolved oxygen sensors
Event Description
CAL READY The sensor is ready for calibration
CAL OK The current calibration is good
TIME EXPIRED The stabilization time during calibration expired
Resolution
Temperature higher than limit
Temperature lower than limit
Calibrate the sensor.
Replace the sensor cartridge
and calibrate the sensor. If the
calibration result is pass, reset
the membrane days in the
DIAG/TEST menu.
Calibrate the sensor.
Contact technical support.
Return to calibration.
English 17