Elcometer 138 User Manual page 9

4 USING THE ELCOMETER 138 BRESLE SALT METER (continued)
4.5 CALIBRATING THE ELCOMETER 138
When using the sensor for the first time or again after several weeks of disuse, perform the electrode
surface treatment procedure, see Section 4.4 on page en-7:
1 Press the ON/OFF button to switch the meter on.
2 Press the CAL button until
3 Open the protection cover and place
84µS/cm solution, see Section 8 'Spares & Accessories on page en-12, into
the measurement cell avoiding the inclusion of bubbles. Washing the sensor
with standard solution beforehand may provide more accurate calibration.
Bubbles in the solution may cause the measurement to be inaccurate.
4
4 Close the protection cover and press the CAL button for over 2 seconds.
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and flash and the calibration value is displayed. After the calibration
CAL
is completed,
CAL
4 If continues to flash and the 'Err' (error message) is displayed, the calibration has
CAL
failed. Check that the standard solution conductivity is correct and perform the calibration
procedure again after thoroughly cleaning the sensor. If the calibration failed whilst using
the correct standard solution, the sensor may be damaged and should be replaced, see
Section 4.3 on page en-7.
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.
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appears on the display.
CAL
an appropriate amount
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and stop flashing and illuminate steadily.
of standard
Appropriate
Cell
Electrode
R
CAL
Button
Protection
Cover
Too Little
en-8