Hach pHD sc Analog Differential pH/ORP Sensors Manuel D'utilisation page 20

Table 4 Error list for pH and ORP sensors (continued)
Error Description
TEMP The temperature sensor is
MISSING missing
GLASS IMP The glass bulb is broken or
LOW reached end of life
6.6 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
Table 5 Warning list for pH and ORP analog sensors
Warning Description
PH TOO HIGH The measured pH is > 13
ORP TOO HIGH The measured ORP value
is > 2100 mV
PH TOO LOW The measured pH is < 1
ORP TOO LOW The measured ORP value
is < –2100 mV
OFFSET TOO The offset is > 8 (pH) or
HIGH 200 mV (ORP)
OFFSET TOO The offset is < 6 (pH)
LOW or –200 mV (ORP)
20 English
Resolution
Examine the wiring for
the temperature sensor.
Make sure that the
correct temperature
element is selected.
Replace the sensor. Call
technical support.
5.
Resolution
Calibrate or replace
the sensor.
Calibrate or replace
the sensor.
Follow the
maintenance
procedures for the
sensor and then
repeat the
calibration.
Table 5 Warning list for pH and ORP analog sensors (continued)
Warning Description
SLOPE TOO The slope is >
HIGH 60 (pH)/1.3 (ORP)
SLOPE TOO The slope is <
LOW 54 (pH)/0.7 (ORP)
TEMP TOO HIGH The measured
temperature is >100 °C
TEMP TOO LOW The measured
temperature is < 0 °C
CAL OVERDUE The Cal Reminder time
has expired
REPLACE The sensor has been in
SENSOR operation > 365 days, or
the predicted life has
expired (Refer to
diagnostic and test menu
on page 18)
NOT The sensor has not been
CALIBRATED calibrated
FLASH FAILURE External flash memory
failed
A ELEC TOO The active electrode
HIGH impedance is > 800 MΩ
A ELEC TOO The active electrode
LOW impedance is < 15 MΩ
Resolution
Repeat the
calibration with a
fresh buffer or
sample.
Clean the sensor,
then repeat the
calibration.
Make sure the right
temperature element
is used.
Calibrate the sensor.
Replace the sensor.
Sensor
Calibrate the sensor.
Contact technical
support.
The sensor is in air.
Return the sensor to
the process.
The sensor is
damaged or dirty.
Call technical
support.