Grundfos AQC-D12, Installation And Operating Instructions Manual

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English (GB)
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10.3 Water connections
If the counterpressure may fall below 0.3 bar or if there is an open
outflow, a pressure-loading valve must be fitted to the outlet of
the measuring cell.
1. Connect the sample water inlet and outlet to the connections
for the sample water inlet (E) and outlet (F).
Fig. 15 Water connections
10.3.1 Mounting the pressure-loading valve
1. Unscrew the connection of the sample water outlet (F).
2. Screw the pressure-loading valve and adaptor (V) onto the
measuring cell outlet.
3. Screw the connection of the sample water outlet onto the
pressure-loading valve.
Fig. 16 Pressure-loading valve
10.4 Preparing the electrode cable for connection to
the measuring amplifier
Cables for electrodes (A, B, K)
1. Cut the electrode cables to the desired length plus
approximately 80 mm for the connections.
2. Remove 80 mm of the outer insulation.
3. Disentangle the braided screen until you reach the next part of
the insulation, and twist it to form a wire.
4. Strip the braided screen (for instance using a shrink hose),
and fit a wire end ferrule.
5. Remove the black (conductive) sheath of the insulated
electrode wire until you reach the insulation.
6. Dismantle the end of the electrode wire.
7. Fit a wire end ferrule to the electrode wire.
Fig. 17 Cable for electrodes (A, B, K)
Cable for measuring electrode (D), temperature sensor (C),
water sensor (D)
1. Cut cables to the desired length plus approximately 65 mm for
the connections.
2. Remove 65 mm of the outer insulation.
3. Dismantle the end of the wires.
4. Fit wire end ferrules to the wires.
Warning
Danger of injuries!
At a pressure of more than 3 bar and if the
measuring cell is not deaerated, the cell might burst.
Do not exceed the max. system pressure of 3 bar.
Fit pressure reducer, if necessary.
Caution
Observe the local pressure! The permissible primary
water pressure is 0.3 to 3.0 bar.
Fit a pressure booster pump, if necessary.
Check the tightness of the measuring cell.
Caution
Only tighten the union nut by hand. Do not use any
tools!
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Caution
Observe the correct installation of the
pressure-loading valve. The arrow on the
pressure-loading valve must point in flow direction!
F
E
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V
Note
The preassembled systems are prewired.
Warning
The electrical connection should be carried out by
qualified personnel!
Observe the local safety regulations!
Protect the cable connections and plugs against
corrosion and humidity.
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Insulated
braided
screen