Elcometer 138 User Manual page 15

5 USING THE CONDUCTIVITY METER (continued)
5 Use the 'INC' and 'DEC' buttons to adjust the upper display to the
correct conductivity value of the calibration solution.
The calibration adjustment window is ±50% from the default reading.

If 'INC' or 'DEC' are not pressed within 5 seconds, 'CO' is displayed and

the meter returns to measuring mode. However, the meter is not
calibrated to the new values, the old calibration is still active. If this
happens, press 'INC' or 'DEC' once again to enter calibration mode.
6 Wait for 5 seconds for the meter to automatically confirm the
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 calibration solution is not within 0°C to 50°C
(32°F to 122°F).
Press 'HOLD ENT' to exit calibration mode without confirming the

calibration.
Note: This user guide explains the 1 point calibration technique only as only one
calibration solution is supplied with the kit; multi-point calibration requires
calibration solutions of different values. For further information on multi-point
calibration, contact Elcometer for a copy of the full Elcometer 138E operating
instructions.
INC
or
DEC
Displayed for 2
seconds and the
meter goes into
calibration mode
5.7 TEMPERATURE CALIBRATION (Figure 7):
Temperature calibration only needs to be performed if the temperature
differs from that of an accurate thermometer. If temperature
calibration is performed, conductivity calibration is mandatory, see
Section 5.6 'Conductivity Calibration' on page en-10.
1 Press the 'On/Off' button to switch the meter on. Make sure the
meter is in measuring mode. If required, press '°C/°F' to select
the desire units of measurement for temperature; Celsius or
Fahrenheit.
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Figure 6: Manual, 1 Point Calibration Sequence
Meter dipped in
1413µS/cm
solution
INC
DEC
Upper display
reading adjusted to
the actual
conductivity value
of the calibration
solution
R
After 5 seconds,
the conrmation
screen is displayed
for 2 seconds
en-14