8
Water Safety Kit (WSK)
32
8.2.3 Calibrating Temperature
ON/OFF to switch the meter on.
Press HOLD/ENT
Press and hold CAL for 3 seconds to
enter temperature calibration mode.
Press CAL to select °C or °F and the
upper display will flash.
Insert the probe into a solution of known
temperature and press HOLD/ENT to
adjust the reading.
After 5 seconds the calibration will be stored
and the meter will revert to normal mode.
8.2.4 Changing Batteries
Unscrew top casing to expose the
battery compartment.
Replace with 4 ‘A76’ button cell
batteries, noting polarity.
Replace top casing.
8.2.5 Error Codes
• Er.0 - temperature calibration is out
of range. Use solution from 0-50°C
• Er.1 - pH calibration solutions are out
of range. Replace buffers with fresh. If
problem persists replace pH electrode
8.3 Contour Comparator
for Free and Total Chlorine
The Contour Comparator is a compact
and easy-to-use platform for the visual
testing of a wide range of drinking water
quality parameters.
The tests all use comparator grade tablet
reagents. Stable over extended periods of
time, they are ideal for use in the field.
Reagents are contained within water
resistant, polypropylene cartons,
which are designed to be re-used
using reagent refill packs.
Additional polypropylene carton reagent
packs are also available.
Chlorine Testing Procedures
8.3.1 Free Chlorine
Select the Chlorine disk with the desired
range and place in the Contour body.
Rinse tubes with sample leaving a few
drops in the measurement tube.
Add one DPD 1 to the sample tube and
crush to a paste.
Add sample to the tube to the 10ml mark
and dissolve any remaining particles.
Place the tube in the measurement position.
Fill the second tube with sample and
place in the blank position.
Facing a good light source, preferably northerly
daylight, rotate the disk until the colours
match and record the result from the lower
right hand window immediately as mg/l Cl
2
.
8.3.2 Total Chlorine
Add one DPD 3 tablet to the Free
Chlorine sample and crush to dissolve.
Wait for 2 minutes to allow colour development.
Match the colours as before and record
the result as mg/l Cl
2
.
8.3.3 Combined Chlorine
Combined Chlorine =
Total Chlorine - Free Chlorine
8.3.4 High Chlorine Levels
If the colour disappears quickly after adding
the sample, the chlorine level is too high.
Dilute the sample with chlorine free water
until the colour persists.
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