Thermo Fisher Scientific CyberScan 6000 Series Meters v.2 - Manual (Page 39)

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Ion Operation: Direct Reading Methods
PH6500, PC6500 and PCD6500 meters
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Measuring Ion Concentration in the Direct Reading with Blank Offset Mode
With Auto Read on
1. Add ionic strength adjuster to the samples.
2. Immerse the ion selective electrode in the stirring sample
3. Touch Measure. When the meter recognizes the reading as stable, STABLE* will appear
on the screen. The value that appears on the screen is the value of the sample minus the
value of the blank reading. The measure screen will fix on this measurement and will not
deviate until Measure is touched again.
4. Repeat steps 1-3 with additional samples. The meter will update the reading each time
Measure is touched.
* Please note that STABLE will only appear if you have completed a successful two point calibration.
With Auto Read off
1. Add ionic strength adjuster to the sample.
2. Immerse the ion selective electrode in the stirring sample. The meter will continually
monitor the ion concentration value. When the meter recognizes the reading as stable,
STABLE is displayed on the measure screen. With the Auto Read function deactivated,
the display on the measure screen will indicate any deviation in the concentration
reading.