7
Operating requirements
• In order for Testomat
®
808 to operate reliably, use Heyl
Testomat
®
indicators in the pH-range 4 – 10.5!
• Only operate the instrument with the parameters specified under
“Technical data”.
• Attention! Water that is too cold can lead to foggy viewing
windows. Ensure that the temperature difference between the
ambient temperature and the water temperature is not too great
(be mindful of the dew point!).
• With Testomat
®
instruments for water hardness monitoring, larger
quantities of heavy metal ions in the softened water might
influence the colour reaction, especially iron above 0.5 mg/I,
copper above 0.1 mg/I and aluminium above 0.1 mg/l (brownish-
red colour display).
• If the measuring water contains more than 20 mg/I CO
2
(carbonic
acid), incorrect evaluations cannot be excluded. In this case, use
an aerator (e.g. special Heyl accessories).
• The concentration of influencing contents can be determined by
using our colorimetric TESTOVAL
®
test kit
• Important! Excessive carbonate hardness and also the
existence of disinfectants in the water can result in
erroneous evaluations.
• Replace the sight glass made of glass to sight glass made of
PMMA, if the silicate content in the sample water is higher than
15 mg/l and a white film is deposited on the glass.
• Careful handling of the instrument increases both its operational
reliability and service life! Therefore, carry out a visual inspection
at regular intervals as described below:
- Has the use-by-date of the indicator expired?
- Are the hose connections of the dosing pump free of leaks?
- Is there any air inside the dosing hoses?
- Are all the water connections free of leaks?
- Are the doors of the instrument closed properly?
- Is the instrument heavily soiled?
- Are the measuring chamber and the drain duct/drain hose
clean?
• Trouble-free operation is only possible when maintenance is
carried out on a regular basis! For more information, please refer
to the section entitled Description of maintenance work on page
37.
• If problems occur, please refer to the section entitled Error
messages/Troubleshooting on page 32.
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