Care & Maintenance - Elcometer 138 User Manual

5 USING THE CONDUCTIVITY METER (continued)
When using the reading locking function :
4 After appears, press the MEAS button
for 0.5 seconds. The reading locking
function is activated.
the measured value is stabilised. When
the measured value is stable,
ashing and the displayed value is locked
with
MEAS
5 Read the displayed value.
6 Press the MEAS button for 0.5 seconds.
The reading locking function is deactivated
and
MEAS
Note: If a measurement result is out of the specied measurement range, the
displayed measured value ashes.
5.7 AFTER MEASUREMENT
1 Press the ON/OFF button to switch the meter off.
2 Wash the sensor with tap water and wipe away any residual
water using a clean tissue.
3 Replace the sensor protection cap.
Note: If the meter is to remain unused for a long period of time, use pure water instead
of tap water to wash the sensor.
6 CARE & MAINTENANCE
The Elcometer 138 Conductivity Meter is designed to give many years
reliable service under normal operating conditions.
Prolonged periods of non-use may cause the sensor to dry out.

This can result in malfunction or unstable readings. Pour
moistening solution into the sensor cell and leave for a few
minutes to allow the sensor to become saturated. Wash the
sensor with water prior to use.
If the measuring surface of the sensor is contaminated or if air

bubbles are regularly present in the sample, clean the sensor
using a diluted neutral detergent (diluted 100 times).
e
When using the reading locking function, deactivate the function before starting every measurement.
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MEAS
and illuminated steadily.
disappears.
e
ashes until
stops
MEAS
MEAS
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