Care And Maintenance; Checking Calibration; Checking Water Quality - Elcometer SCM400 Operating Instructions Manual

5 CARE AND MAINTENANCE

The Elcometer 130 SCM400 does not contain any user-serviceable
components. In the unlikely event of a fault, return the Elcometer 130 SCM400
to your Elcometer supplier or directly to Elcometer. The warranty will be
invalidated if the instrument has been opened.
Contact details can be found:
• On the outside cover of these operating instructions.
• At www.elcometer.com
Please note that the back plate of the Elcometer 130 SCM400 should not be
removed by the User - doing so could affect the calibration.

5.1 Checking calibration

The Elcometer 130 SCM400 has been factory calibrated and cannot be
calibrated by the User.
However, it is possible to check that the instrument is measuring correctly. To
do this, take samples as detailed in "Taking samples using standard sample
papers" on page 5, but using precisely 1.5 ml of a solution of 31.6 mg (±0.1)
analar sodium chloride, dissolved in 100 ml of high purity water.
The reading should be in the range 5 µg.cm
For temperatures below 25°C apply a correction factor of -1.7%/° C.
For temperatures above 25° C apply a correction factor of +1.7%/° C.
Note: When finished, thoroughly clean the syringe using high purity water.

5.2 Checking water quality

Water quality can be checked on the Elcometer 130 SCM400 as follows:-
1. Switch the Elcometer 130 SCM400 on by pressing the red pushbutton
once. The display will show:-
SCM........Ready
2. Eject 1 ml of the water in question onto the electrode surface using the 2 ml
syringe (Figure 2).
3. Close the lid and press the green pushbutton.
4. If a reading other than SALT LEVELS TOO LOW is obtained, then the water
purity is not adequate for use with the Elcometer 130 SCM400
-2
(±10%) at 25° C.
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