Elcometer 138 User Manual page 12

5 USING THE CONDUCTIVITY METER (continued)
Figure 4: Selecting auto calibration and 1 point calibration
INC
INC
Using automatic calibration (Figure 5):
Automatic calibration is suitable for use with known conductivity
standard solutions.
The solution used should correspond to the selected measuring range.
One single use 20ml pouch of standard 1413 µS/cm (1.413 mS/cm)
calibration solution is supplied in each kit. When using this solution,
the measuring range should be set to 'LO', see Section 5.5 'Selecting
the Measuring Range' on page en-8.
Note: If using a different conductivity standard solution to the one supplied in the kit
contact Elcometer for a copy of the full Elcometer 138E operating instructions.
During automatic calibration, the meter will automatically detect the
conductivity standard if it's value is within 50% tolerance.
Always use fresh calibration standard solutions. Before you begin,
prepare the solution in two beakers; one for rinsing and the other for
calibration. Rinse the electrode in pure water before calibration.
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.
en-11
R
HOLD
ENT
DEC
HOLD
ENT
After 1 second
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HOLD
ENT
Power-Up
Sequence