LaMotte 5 Series pH Meter - Manual (Page 13)

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3.1.3 Resetting User Calibrated Values
The calibrated pH values can be reset to the factory default using the
procedure below. The temperature offset will not be reset using this
procedure. To abort the reset, press CAL to revert to the measurement
mode.
1. Press and hold CAL while switching the meter on using the ON/
OFF key. The DISPLAY will show “rSt” blinking.
2. Press the ENTER key to confi rm. The meter will automatically
clear all stored pH calibrations and revert to the measurement
mode.
3.2 Temperature Calibration
3.2.1 With Temperature Probe
The temperature probe supplied with the meter is factory calibrated. Over
time, the temperature calibration may drift and require recalibration. If
the temperature probe is replaced the meter should be recalibrated.
1. Connect the temperature probe to the meter. Press the MODE
key until the “°C” annunciator appears on the DISPLAY.
2. Compare the displayed value to a NIST certifi ed thermometer or
other thermometer known to be accurate. For the most accurate
results, place both the probe and thermometer in a constant
temperature bath.
3. Press the CAL key to enter the temperature calibration mode.
The DISPLAY will show “CA” momentarily and the displayed
reading will fl ash.