Taking A Reading; Care & Maintenance - Elcometer 138 User Manual

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5 TAKING A READING (continued)
5.3 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
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unstable readings. Pour conditioning 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
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sample, clean the sensor using a diluted neutral detergent (diluted 100 times).
The Elcometer 138 Conductivity Meter incorporates a Liquid Crystal Display. If the display is heated
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above 50°C (120°F) it may be damaged. This can happen if the meter is left in a car parked in
strong sunlight.
The Elcometer 138 Conductivity Meter does not contain any user-serviceable components. In the
unlikely event of a fault, the meter should be returned to your local Elcometer supplier or directly to
Elcometer Limited - contact details can be found on our website, www.elcometer.com. The warranty will
be invalidated if the instrument has been opened.
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