Elcometer 138 User Manual page 16

5 USING THE CONDUCTIVITY METER (continued)
2 Dip the meter into a solution of known temperature and allow
time for the temperature reading to stabilise.
3 Press 'INC' or 'DEC' to enter calibration mode. The 'CAL'
indicator appears on the display, immediately press '°C/°F' to
switch to temperature calibration mode.
When you enter calibration mode, if the conductivity reading is outside the

specified range 'Er.1' is displayed. You can still proceed to temperature
calibration mode by pressing '°C/°F' immediately. If '°C/°F' is not pressed
within two seconds, the meter exits calibration mode and returns to
measurement mode.
4 The upper display shows the measured temperature reading
based on the last set offset (if any) and the lower display shows
the default (uncalibrated) temperature reading based on factory
settings.
5 Use the 'INC' and 'DEC' buttons to adjust the upper temperature
reading to the known temperature value of the solution.
The temperature adjustment window is ±5°C (±9°F) from the default

reading.
6 Wait for 5 seconds for the meter to automatically confirm the
temperature calibration by displaying 'CO' and returning to
measurement mode.
'Er.0' is displayed and the meter returns to measurement mode if the

temperature of the solution is not within 0°C to 50°C (32°F to 122°F).
Press 'HOLD ENT' to exit temperature calibration mode without confirming

the calibration.
Dipped in a
solution of known
temperature
en-15
R
Figure 7: Temperature Calibration Sequence
INC
DEC
Calibration Mode
°C/°F
Temperature Calibration Mode
Measurement
Mode
INC
DEC
Conrmation
displayed for 2
seconds
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