Error Messages - Hach pH Manuel D'utilisation

5.4 Prepare for storage
For short-term storage (when the sensor is out of the process for more than one hour), fill the
protective cap with pH 4 buffer or distilled water and put the cap back on the sensor. Keep the
process electrode and reference junction salt bridge moist to avoid slow response when the sensor is
returned to operation.
For extended storage, repeat the short-term storage procedure every 2 to 4 weeks, depending on the
environmental conditions. Refer to
Section 6 Troubleshooting
6.1 Intermittent data
During calibration, data is not sent to the datalog. Thus, the datalog can have areas where the data is
intermittent.
6.2 Sensor diagnostic and test menu
The sensor diagnostic and test menu shows current and historical information about the instrument.
Refer to Table 2. To access the sensor diagnostic and test menu, push menu, then select SENSOR
SETUP > [Select Sensor] > DIAG/TEST.
Option Description
PROBE INFO Shows the sensor type, name, serial number, software version and driver version.
CAL DATA Shows the pH slope (mV/pH) and date of the last calibration. The pH slope should
be –55 to –61 mV.
SIGNALS SENSOR SIGNAL—Shows the sensor reading in mV. The mV range is –60 to +60 mV (0 mV =
pH 7 ).
SENS ADC CNTS—Shows the digital number that represents the pH reading.
TEMP ADC CNTS—Shows the digital number that represents the temperature reading.
ELECTRD STATE—Shows the health of the active and reference electrode (GOOD or BAD).
When "BAD" shows, clean the sensor and replace the salt bridge. Replace the sensor if
necessary.
ACTIVE ELECT—Shows the impedance of the active electrode.
REF ELECTRODE—Shows the impedance of the reference electrode.
IMPED STATUS—When enabled (recommended), the impedance of the active and reference
electrode are measured at 1 minute intervals. An error shows on the controller display when the
impedance of the active or reference electrode is not between the low and high impedance limits.
COUNTERS SENSOR DAYS—Shows the number of days the sensor has been in operation.
RESET SENSOR—Sets the SENSOR DAYS and the ELECTRODE DAYS value to zero.
ELECTRODE DAYS—Shows the number of days since the salt bridge was replaced.
Note: The ELECTRODE DAYS value is automatically set to zero when the salt bridge is replaced.

6.3 Error messages

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, push menu and select DIAGNOSTICS >
[Select Sensor] > ERROR LIST. A list of possible errors is shown in
Error Description
PH TOO HIGH The measured pH is > 14.
ORP TOO HIGH The measured ORP value is > 2100 mV.
Specifications on page 3 for temperature storage limits.
Table 2 Sensor DIAG/TEST menu
Table 3 Error messages
Table 3.
Resolution
Calibrate the sensor.
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