Elcometer 138 User Manual page 12

5 USING THE CONDUCTIVITY METER (continued)
4 Close the protection cover and press the
CAL button for over 2 seconds.
ash and the calibration value is
displayed. After the calibration is
completed,
illuminate steadily.
5 Clean the sensor with tap water and
remove moisture.
6 Press the MEAS button for 0.5 seconds to
enter the measurement mode and prepare
for measurement.
Note: The Elcometer 138 Conductivity Meter has a two-point calibration mode. For
details, see the full Elcometer 138 operating instructions which is available to
download via our website. The two-point calibration mode requires two standard
solutions.
5.6 TAKING A READING
1 Press the ON/OFF button to switch the
meter on.
2 Open the protection cover and place drops
of the sample on to the sensor.
Put an appropriate amount of the test sample

into the measurement cell avoiding the
inclusion of bubbles. Bubbles in the solution
may cause the conductivity measurement to be
inaccurate.
Cell
3 Close the protection cover.
Ambient air may cause the measurement values to fluctuate. To reduce

environmental interference, close the protection cover.
Without using the reading locking function:
4 Read the value displayed when
en-11
R
and stop ashing and
CAL
Appropriate
Electrode
MEAS
and
CAL Button
Too Little
appears.
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CAL
Button
CAL