Elcometer 138 Guia Del Usuario página 11

4 USING THE CONDUCTIVITY METER (continued)
1 Press the 'On/Off' button to switch the meter on. Make sure the
meter is in measuring mode. Press the 'INC' or 'DEC' button to
enter conductivity calibration mode.
2 The 'CAL' indicator appears on the display. 'CAL' and '1.Pnt' are
briey displayed.
3 The upper display shows the conductivity reading and the lower
display shows the calibration standard value; '1413' if using the
solution supplied with the kit.
4 Rinse the electrode with the calibration standard then dip the
electrode into the second beaker containing the calibration
standard. Swirl gently to create a homogenous sample and allow
time for the reading to stabilise.
'Er.1' is displayed if the conductivity of the calibration solution is outside

the tolerance range.
'Er.0' is displayed and the meter returns to measurement mode if the

temperature of the calibration solution is not within 0°C to 50°C
(32°F to 122°F).
Press 'INC' or 'DEC' to exit auto calibration during any of the above steps.

5 Press 'HOLD ENT' to conrm the calibration. 'CO' is displayed
for two seconds, calibration is complete and the tester returns to
measuring mode.
'Er.1' is displayed if 'HOLD ENT' is pressed before the meter recognises

the calibration solution.
Note: This user guide explains the 1 point calibration technique only as only one
calibration solution is supplied with the kit; multi-point calibration requires
calibration solutions of different values. For further information on multi-point
calibration, contact Elcometer for a copy of the full Elcometer 138E operating
instructions.
INC
or
DEC
Displayed for 2
seconds and the
meter goes into
calibration mode
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Figure 5: Automatic, 1 Point Calibration Sequence
Calibration
standard values
displayed
sequentially until
the meter nds a
matching solution
HOLD
ENT
Meter dipped in
1413µS/cm
solution and
automatically
detects the
calibration standard
R
Conrmation of
calibration
displayed for 2
seconds
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