TEMPHION INSTRUCTIONS
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SETTINGS AND CALIBRATION
ISE Channel Calibration
(continued)
Two-Point Calibration
— First Calibration Point—
• Rinse sensor with distilled water and pat dry.
• Place sensor in beaker of distilled water, as prepared
above. (Solution must be deep enough to cover the
element cutout.)
• Add 1 cc of selected standard to the water. Depending
on which solution you are using, this will result in a
concentration as shown below:
• 0.1 Molar NaBr (Bromide) = 79.10 ppm
• Stir to distribute standard evenly.
• Allow time for sensor to stabilize (15–20 minutes).
•
In the Ref ppm box for the first point, enter the
concentration you have chosen.
•
Click the first Measure button.
• When readings have stabilized to your satisfaction, click
the OK button on the pop-up box.
— Second Calibration Point—
• Add 10 cc of the same standard to the water.
Depending on which solution you are using, this will
result in a concentration as shown below:
• 0.1 Molar NaBr (Bromide) = 791.8 ppm
• Stir to distribute standard evenly.
• Allow time for sensor to stabilize (15–20 minutes).
• In the Ref ppm box for the second point, enter the
concentration you have chosen.
• Click the second Measure button.
• When readings have stabilized to your satisfaction,
click the OK button on the pop-up box.
— Applying Calibration Values—
• Observe the M and I values in the right hand section of
the calculator. M should be between
–
50 and –60.
• Click the Apply button to apply calibration values.
• The reference values, the computed M and I, and the
sample temperature will be transferred to the calibration
fields.
• Click OK to save the values to the sensor.
— Verifying Calibration Values—
• Using the Real Time Monitor, take a few readings while
the sensor is still in the standard. Be sure units are set
to ppm. Readings should be very close to your selected
concentration.
