It is imperative to fit the tapping band to the inlet (suction) side of the pool pump unless using
a venturi system. The required range of pressure/suction is negative 20 kPa to negative 70
kPa. After selecting the position for the tapping band on the pool pump inlet pipe, ensure that
it is as near as possible to the pool pump.
When the Chemigem is working it is essential that the multi-electrode (probe) and
injector nozzle be in a rapidly moving water stream. If not, the unit will display incorrect
and erratic readings and may cause excess additions of concentrated chemicals.
The tapping band can be positioned on either horizontal or vertical pipes, provided the multi-
electrode (probe) is fitted exactly horizontally.
If the multi-electrode (probe) is positioned with the sensor tips aiming downwards it will
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trap air bubbles.
If the multi-electrode (probe) is positioned with the sensor tips aiming upwards it will trap
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dirt or debris.
Both of these positions will cause erratic and false readings of the swimming pool chemical
levels.
Drilling the Tapping Band Holes
Drill a hole using a 19mm hole-saw through both sides of the PVC pipe.
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Ensure the surround to the hole at the “O” ring contact is smooth and clean.
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Fit the tapping band, first checking that the “O” rings are in position and that the arrow on
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the tapping band points toward the pool pump.
Do not use grease or sealing compound on this fitting.
To check the accuracy of the tapping band position look through the multi-electrode (probe)
arm (feel with your finger or use a mirror if the position is inaccessible) making sure the multi-
electrode (probe) is lined up exactly with the holes. Tighten by hand and then give the nuts
half a turn with a wrench. If the tapping band is over tightened it will split.
Inner Shell of Tapping Band
The inner shell of the tapping band is used if the PVC pipe has a 40mm diameter. If 50mm
diameter PVC pipe is used, the inner shell of the tapping band is not required.
MULTI-ELECTRODE (PROBE) INSTALLATION
Remove the multi-electrode (probe) protective cap, before fitting the multi-electrode (probe)
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to the tapping band.
The protective cap should be retained for possible future use.
• Fully insert the multi-electrode (probe) (with “O” ring fitted) into the tapping band and hand
tighten only.
Do not use grease or sealant on this connection to avoid contaminating the sensing
part of the multi-electrode probe.
RAINBOW
POOL
PRODUCTS
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LTD