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Operational Guide

Contaminated Buer

“CONTAMINATED BUFFER” appears in order to alert

that the buer could be contaminated. Refresh your

buer and continue the calibration procedure.

Broken Temperature Sensor

If the temperature sensor should malfunction or break at any time, a temperature

of “25.0 ºC” will blink on the second LCD line and the

message “BROKEN TEMPERATURE SENSOR” will

appear on the third LCD line after leaving calibration.

The calibration will have the compensation at 25 ºC.

Replace probe if this occurs.

Note: If this occurs during logging “25 ºC !” will appear in the CSV le.

Good Laboratory Practice (GLP) refers to a quality control function used to

ensure uniformity of sensor calibrations and measurements. The dedicated

GLP key opens a le of the latest calibration information. Use the qp keys to

scroll the stored information. This includes the buers used, temperature of the

buer, time and date of the last calibration, the sensor serial number and the

calculated oset and percent slope. This information is available in Basic and

Standard Modes. This information is also included with every data log. Newest

calibration points report as a solid number, older calibration data (that is still

used) will be displayed blinking.

If calibration has not been performed, the instrument

displays a blinking “NO CAL” message.

The pH calibration oset and slope (the GLP slope is

the average of the calibration slopes; the percentage

is referenced to the ideal slope value at 25 ºC). The

condition and response indicators displayed are from

the last calibration.

Pressing the qp keys, the last calibration date (yyyy.

mm.dd) together with the current reading is displayed.

Calibration

Messages

pH GLP

Information

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Hanna Instruments Edge HI 2020 User Manual

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