Thermo Fisher Scientific CyberScan pH 1000/pH 2500 - Manual (Page 28)

Instruction Manual pH 1000/ 2500
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12.4 Viewing pH Electrode Offset
This function is diagnostic in nature and allows you to view the
offset of the pH electrode in mV. The offset is based on the pH
7.00 buffer calibration. If the calibration has yet to be performed
at this pH, the meter shows 00.0 mV (which is the ideal). The mV
shows the efficiency of the electrode and how much the meter
has to compensate for it. Generally a value of +/- 15 mV is
acceptable with the ideal being 0.0 mV.
1. Ensure that you are in the pH measurement mode.
2. Press SHIFT and OFFSET. The LCD shows the offset of the pH
electrode.
12.5 Viewing pH Electrode Slope
This diagnostic function allows you to view the slope of the pH
electrode based on the Nerstian equation. Slope displayed is the
average slope based on calibrations. If no calibration has been
performed or if the meter has been reset in the SETUP function,
the meter shows the default value of 100.0%.
1. Ensure that the meter is in the pH measurement mode.
2. Press SHIFT and then SLOPE key. The LCD shows the slope
percentage of the pH electrode. After two
seconds the display
then reverts to its normal operation.
12.6 Viewing Ion Electrode Slope (for pH2500 only)
Similarly, in the Ion mode, you can view the slope of Ion
electrode. Slope is displayed as mV per decade. If no calibration
has been performed or if the meter has been reset in the SETUP
function, the meter shows the default value of “- - - -“.
1. Ensure that the meter is in the Ion measurement mode.
2. Press SHIFT and SLOPE. The LCD shows the slope of the Ion
electrode in mV/decade. After two seconds the display then reverts
to its normal operation.