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4. Calibration
4.1 Calibration Procedure
1. Switch the
mini
CHEM
-Sal
on.
2. Ensure that the Salinity/TDS sensor is correctly connected (see section 3.4).
3. Set the function switch to
STANDBY
, to ensure that the (optional) relay
output is not activated when moving the Salinity/TDS sensor between
solutions.
4. For the GK-1 sensor (part no 112206), ensure that the white protective cover
is fitted with the vent hole towards the cable end of the sensor.
5. Rinse the Salinity/TDS sensor in distilled water and blot dry.
Zero Calibration
6. Shake the Salinity/TDS sensor dry and hang it in air.
DO NOT
wipe the
platinised platinum electrode surface, as this will remove the platinum-black
layer.
7. When the reading has stabilised, adjust the
ZERO
control until the display
reads exactly zero.
Span Calibration
8. Place the Salinity/TDS sensor into a small sample of Salinity/TDS standard.
A suitable standard should be chosen for the display range of the unit.
9. For GK-1 (part no 112206) and GK-10 (part no 112207) sensors, ensure that
they are immersed at least to the vent hole in the white plastic cover. The GK-
0.1 (part no 112205) sensor does not have a cover, so it should be immersed
to the large thread (see diagrams below).
