6.4 pH Calibration Messages
1. If a 1-point calibration has been successfully performed, the 90-FL will display the following
message and the asymmetry of the electrode. Note that the slope value from the last calibration
is also shown.
Asymmetry Calibration Successful
+0.10pH Asym 100% Slope
2. If a 1-point calibration has failed, the 90-FL will display the following message and the failed
asymmetry value of the electrode.
Calibrate Failed, 1.2pH Asymmetry
Repeat Cal. or Initialise Calibration
3. If a 2-point calibration has been successfully performed, the 90-FL will display the following
message and the asymmetry and slope of the electrode.
Slope & Asymmetry Calibration Successful
+0.10pH Asym 99.0% Slope
4. If a 2-point calibration has failed, the 90-FL will display the following message and the failed
slope value of the electrode.
Calibrate Failed, 80% Slope
Repeat Cal. or Initialise Calibration
5. The 90-FL has an allowable Asymmetry range of –1.00 to +1.00 pH. The allowable Slope
range is 85.0 to 105.0 %. If calibration fails due to either the Asymmetry or the Slope being
outside these limits, then please consult the Troubleshooting guide (section 16.4) for possible
remedies.
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