Elcometer 138 User Manual page 13

5 USING THE CONDUCTIVITY METER (continued)
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 confirm 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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