5. Put the rubber dust cap back on.
6. Keep the probe in dry storage when not in use.
Calibrate the ISFET probe
Refer to Prepare the probe for storage on page 26 before calibration.
N O T I C E
Do not use the probe for applications that cycle between hot and room temperature samples.
Note: Remove other active or non-active measurement devices during pH or conductivity measurement. Other
devices, even AC power, can cause interference.
Note: Only do calibrations away from the sun. Direct sunlight can cause unstable readings or difficulty in
calibration.
1. Connect the probe to the meter.
2. Set the meter power to on.
3. Clean the probe with new deionized water and dry with a lint-free cloth.
4. Put the probe in the pH 7 buffer.
5. Clean the probe with deionized water and dry with a lint-free cloth.
6. Put the probe in the second buffer (pH 4 or pH 10).
7. Read the results.
8. If the result is not correct, the probe is not correctly hydrated.
Soak the probe for another 5 minutes in pH 7 buffer, then do the calibration again.
Clean the ISFET probe
N O T I C E
Do not use sharp metal objects (a needle, a pin, etc.) to clean the sensor. This can scratch the sensor and cause
permanent damage to the probe.
For use in dairy, cheese or meat applications, soak the probe in Pepsin Cleaning Solution for
15 minutes before the probe is cleaned.
Regularly clean a non-glass probe:
1. Remove the rubber dust cap from the probe, then rinse with new deionized water.
2. Use a soft-bristle toothbrush and a mild detergent (a few drops of dish soap in a warm cup of
water) to carefully clean the probe.
3. Rinse with new deionized water to remove all debris from the sensor surface.
4. Dry the probe with a lint-free cloth.
5. Calibrate the probe again. Refer to Calibrate the ISFET probe on page 27, then Prepare the
probe for storage on page 26.
Repair the ISFET probes
N O T I C E
Do not use the probe to find out if the buffer is above 60 °C (140 °F). If the probe is suddenly put into very hot
liquid, the probe can be permanently damaged.
Monitor how long the probes are in dry storage. If the probes are in storage for an extended period of
time, the KCI gel at the reference junction can crystallize.
1. Heat pH 7 buffer to approximately 45 to 60 °C (115 to 140 °F).
2. Soak the probe for 2 minutes.
3. Put the probe in room temperature pH 7.00 buffer and let cool.
English 27
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