Elcometer 138 User Manual page 17

5 USING THE CONDUCTIVITY METER (continued)
5.8 RESETTING THE CONDUCTIVITY METER
The reset option restores the calibration and other parameters back to
the factory default settings.
1 With the meter switched off, press and hold the 'HOLD ENT' button,
then switch the meter on. Release the 'HOLD ENT' button.
2 The lower display shows 'rSt' (reset) and the upper display blinks
'No'. Press 'INC' or 'DEC' to select 'Yes' to proceed with the
reset or 'No' to exit without resetting.
Press '°C/°F' to return to measurement mode without making any selection.

3 Press 'HOLD ENT' to confirm your selection, 'CO' is displayed. If
'Yes' was selected, the meter resets to the factory default
settings. The power-up sequence is displayed and the meter
goes to measurement mode.
Parameter
User Calibration
Temperature Unit of Measurement
Temperature Offset
Auto Calibration
1-point Calibration
Conductivity Calibration Factor
5.9 TAKING A READING
Before you begin, remove the electrode's protective cap. Soak the
electrode for a few minutes in alcohol to remove any dirt or oil stains
which will affect the accuracy of the meter. Rinse thoroughly with pure
water and shake off dry.
1 Press the 'On/Off' button to switch the meter on. The 'MEAS'
indicator appears when the meter is in measurement mode.
2 Put an appropriate amount of the test sample on the
measurement electrode avoiding the inclusion of bubbles which
may cause the conductivity measurement to be inaccurate.
3 The reading is shown in the upper display, automatically
temperature compensated to normalised temperature of 25°C.
The temperature of the solution is shown in the lower display.
Press '°C/°F' to toggle between Celsius and Fahrenheit.
'Or' (over range) is displayed if the reading is outside the selected range.

If this occurs, select an appropriate range to suit the reading, see Section
5.5 'Selecting the Measurement Range' on page en-8.
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Factory Default
(Reset)
Celsius (°C)
0
Enabled
Enabled
1.0
R
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