Hach pHD Sensor User Manual page 18

Warning Description
PH MAINT RECD pH sensor maintenance is recommended
The slope is outside of the -50 to -61 mV/pH range
PH MAINT RECD pH sensor maintenance is recommended
The offset is outside of ±45 mV but within ±60 mV
T MAINT RECD The temperature offset is outside of ±3 °C but within
±5 °C
Event log
The controller provides one event log for each sensor. The event log stores a variety of events that
occur on the devices such as calibrations done, calibration options changed, etc. A list of possible
events is shown in Table
downloading the logs, refer to the controller user manual.
Event
Power On
Flash Failure
1pointpHCalibration_Start
1pointpHCalibration_End
2pointpHCalibration_Start
2pointpHCalibration_End
1pointBufferpHCalibration_Start Start of one-point buffer calibration for pH
1pointBufferpHCalibration_End
2pointBufferpHCalibration_Start Start of two-point buffer calibration for pH
2pointBufferpHCalibration_End
TempCalibration_Start
TempCalibration_End
pHCalSetDefault
TempCalSetDefault
AllCalSetDefault
pHCalOptionChanged
TempCalOptionChanged
SensorConfChanged
ResetpH CalHist
ResetTemp CalHist
ResetAllSensorsCalHist
ResetpHSensor
18 English
Table 4 Warning list for the sensor (continued)
5. The event log can be read out in a CSV format. For instructions on
Table 5 Event log
Description
The power was turned on
The external flash has failed or is corrupted
Start of one-point sample calibration for pH
End of one-point sample calibration for pH
Start of two-point sample calibration for pH
End of two-point sample calibration for pH
End of one-point buffer calibration for pH
End of two-point buffer calibration for pH
Start of temperature calibration
End of temperature calibration
The pH calibration data was reset to the default
The temperature calibration data was reset to the default
All sensor calibration data was reset to the default
The pH calibration option was changed
The temperature calibration option was changed
The sensor configuration was changed
The pH calibration history was reset
The temperature calibration history was reset
All sensor calibration history was reset
The pH calibration data (sensor days, calibration history and calibration data)
was reset to the default
Resolution
Clean the pH sensor, then repeat
the calibration with a fresh buffer
or sample, or replace the sensor.
Clean the sensor and replace the
salt bridge and standard cell
solution and then repeat the
calibration, or replace the sensor.
Calibrate the temperature.