Hach 8350.3 Benutzerhandbuch Seite 17

Option
Sensor days
Reset
6.4 Error list
When an error occurs, the reading on the measurement screen flashes and all outputs are held when
specified in the Controller > Outputs menu. The screen changes to red. The diagnostics bar shows
the error. Push on the diagnostic bar to show the errors and warnings. As an alternative, push the
main menu icon, then select Notifications > Errors.
A list of possible errors is shown in
Error
pH is too high!
pH is too low!
ORP is too high!
ORP is too low!
Offset is too high!
Offset is too low!
Slope is too high!
Slope is too low!
Temperature is too high!
Temperature is too low!
ADC failure
Active impedance is too
high!
Active impedance is too
low!
Reference impedance is
too high!
Reference impedance is
too low!
The difference between the
buffers is too small!
Sensor is missing.
Table 2 Diagnostics/Test menu (continued)
Description
Shows the number of days that the sensor has been in operation.
Sets the Sensor days counter to zero.
Reset the Sensor days counter when the sensor is replaced.
Table 3.
Table 3 Error list
Description
The measured pH is > 14.
The measured pH is < 0.
The measured ORP value is
> 2100 mV.
The measured ORP value is
< –2100 mV.
The offset is > 9 (pH) or 200 mV
(ORP).
The offset is < 5 (pH) or –200 mV
(ORP).
The slope is > 62 (pH)/1.3 (ORP).
The slope is < 50 (pH)/0.7 (ORP).
The measured temperature is >130 °C.
The measured temperature is
< –10 °C.
The analog to digital conversion failed.
The active electrode impedance is >
900 MΩ.
The active electrode impedance is <
8 MΩ.
The reference electrode impedance is
> 900 MΩ.
The reference electrode impedance is
< 8 MΩ.
The buffers for 2-point auto correction
have the same value.
The sensor is missing or disconnected.
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.
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.
Contact technical support.
The sensor is in air. Return the sensor to
the process.
The sensor is damaged or dirty. Contact
technical support.
Buffer leaked or evaporated. Contact
technical support.
The reference electrode is damaged.
Contact technical support.
Complete the steps in Test the pH sensor
on page 16.
Examine the wiring and connections for
the sensor and for the module (or digital
gateway).
English 17