Error List - Hach pHD sc Analog Differential pH/ORP Sensors Manuel D'utilisation

Table 3 Sensor DIAG/TEST menu (continued)
Option Description
SENSOR DAYS Shows the number of days that the sensor has
been in operation.
RESET SENSOR Resets the number of days that the sensor has
DAYS been in operation.

6.5 Error list

When an error occurs, the reading on the measurement screen flashes
and all outputs are held when specified in the controller menu. To show
the sensor errors, press the MENU key and select Sensor Diag, [Select
Sensor], Error List. A list of possible errors is shown in
Table 4 Error list for pH and ORP sensors
Error Description
PH TOO The measured pH is > 14
HIGH
ORP TOO The measured ORP value
HIGH is > 2100 mV
PH TOO LOW The measured pH is < 0
ORP TOO The measured ORP value
LOW is < –2100 mV
OFFSET TOO The offset is > 9 (pH) or
HIGH 200 mV (ORP)
OFFSET TOO The offset is < 5 (pH)
LOW or –200 mV (ORP)
SLOPE TOO The slope is >
HIGH 62 (pH)/1.3 (ORP)
Table 4.
Resolution
Calibrate or replace the
sensor.
Calibrate or replace the
sensor.
Follow the maintenance
procedures for the
sensor and then repeat
the calibration, or replace
the sensor.
Repeat the calibration
with a fresh buffer or
sample, or replace the
sensor.
Table 4 Error list for pH and ORP sensors (continued)
Error Description
SLOPE TOO The slope is <
LOW 50 (pH)/0.7 (ORP)
TEMP TOO The measured temperature
HIGH is >130 °C
TEMP TOO The measured temperature
LOW is < –10 °C
ADC The analog to digital
FAILURE conversion failed
A ELEC TOO The active electrode
HIGH impedance is > 900 MΩ
A ELEC TOO The active electrode
LOW impedance is < 8 MΩ
R ELEC TOO The reference electrode
HIGH impedance is > 900 MΩ
R ELEC TOO The reference electrode
LOW impedance is < 8 MΩ
SAME The buffers for 2 point
BUFFER buffer calibration have the
same value
SENSOR The sensor is missing or
MISSING disconnected
Resolution
Clean the sensor, then
repeat the calibration, or
replace the sensor.
Make sure that the
correct temperature
element is selected.
Power off and power on
the controller. Call
technical support.
The sensor is in air.
Return the sensor to the
process.
The sensor is damaged
or dirty. Call technical
support.
Buffer leaked or
evaporated. Call
technical support.
The reference electrode
is damaged. Call
technical support.
Complete the steps in
Test the pH sensor
on page 17.
Examine the wiring and
connections for the
sensor and for the
module.
English 19