Calibration - Spectrum Technologies FieldScout 2127W Manual

Calibration Status of Devices
One of the two following messages will appear when you connect your probe:
1. Last Calibration (Date/Time): The last pH calibration is still valid. The probe is ready for use. The date/time stamp of the
last calibration are indicated. Depending on the number of calibration points, the number of decimals is adapted for the pH
value.
2. Calibration Required (pH): The probe needs calibration: A. If it has never been calibrated
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We recommend using pH buffers for the calibration of the pH probes
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Always use fresh and uncontaminated buffers when performing a calibration
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Buffers can be polluted due to exposure to open-air or (UV) light, close the cap on the bottle as soon as possible
pH Calibration
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Select your probe in the app.
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Scroll down to "Calibration Information"
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Select "New pH Calibration" and follow the instructions
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During measurements, both the sensor and the reference diaphragm must be in the buffer. When the calibration is
successful, the remark at the probe in the app will change to "Last Calibration (Date/Time)"
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The pH calibration can be done with a single point (1 buffer) or multi-point (2, 3 or 5 buffers). The more points taken
for calibration, the more accurate the pH reading. The greater the difference in pH of samples, the more points recom-
mended to calibrate.
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1 point calibration
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2 point calibration*
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3 point calibration
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5 point calibration
When the calibration is successful, the slope between two points of the calibration is provided as a percentage. Select the
% to see which slope it refers to. Normal slope percentages should be between 105% and 95%. Slopes outside these values
indicate that the measured pH may be less accurate. In that situation, it is strongly advised to revitalize or replace the probe.
24 hours after the last calibration, the number of decimals are reduced to a maximum of one. Perform a new multi-point
calibration to resume 2-3 decimal accuracy. This number can be adjusted under Settings - Hours before a drift warning is
shown.
The FieldScout pH probes are Automatic Temperature Compensated (ATC).
Temperature Calibration
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Temperature calibration is not required. To calibrate, select Settings and toggle Advanced Mode to the "ON" position.
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Press the Home button and select your probe from registered devices.
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Scroll down to "Calibration Information". Select "New Temperature Calibration" and follow the directions.
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The average temperature is calculated between the manual temperature and the temperature reading on probe.
CALIBRATE YOUR PROBE(S)
1 decimal accuracy For quick pH measurements spanning 1-2pH values
2 decimal accuracy For accurate pH measurements spanning <3pH values and quick
measurements spanning 3-6pH values.
*Recommended for agricultural use with the provided pH 4 and 7
2 decimal accuracy Recommended for accurate pH measurements spanning 3-6pH values
and quick measurements spanning >6pH values
2 decimal accuracy Recommended for accurate pH measurements spanning >6pH values
B. The pH calibration is not valid any longer
solutions
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