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the floating contact is switched over. If the key is pressed for a third time,
the meter exits auto mode.
Litre-gallon key
Briefly press this key once to select the throughput indication in litres per
minute (l/min) or gallons per minute (GPM). Press the key for approx.
3 seconds to reset the total throughput volume ("JOB") to 0. We recommend
setting "JOB" to 0 after every filter change. Press the key for 8 seconds to
reset the "TOTAL" litres value to 0.
5.5. Troubleshooting
Water conductivity is too high after filtration:
• Has the membrane been installed correctly (tap at the bottom, prefilter,
spacer ring, cover)?
• Has the cover been fitted correctly (polished surface on the outside)?
• Is there carbon dioxide in the water? This is not filtered out and increases
conductivity.
Throughput is too low:
• Is the minimum throughput of 30 l/min present at the inlet?
• Is the prefilter clogged?
6. Maintenance
6.1. Changing the batteries
If the battery symbol (
) is displayed, the batteries must be replaced.
Undo the 4 screws on the red cover, lift off the cover and insert 3 new AAA
(LR03) 1.5 V batteries. Make sure the cover seal is seated properly. Refit the
cover and secure with the screws. Check the device is working correctly.
More detailed information about the combined meter can be
found on our website under the product PUROTAP® LFM-20.