wtw 115 VAC, Operating Manual

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ba75731e04 12/2013
Installation Cleaning Air Box
3.6 Installing / retrofitting a check valve (option)
The BPV check valve (see chapter 6 R
EPLACEMENT PARTS AND ACCESSORIES
) is
available as an accessory. It prevents the test sample from rising through the
cleaning nozzles into the hose system due to hydrostatic pressure. It is espe-
cially recommended with immersion depths of more than 1 m and can be retro-
fitted at any time.
The check valve is mounted into the length of tubing on the pressure side in the
enclosure of the Cleaning Air Box. To do so, proceed as follows:
WARNING
While the Cleaning Air Box is operating, there are the following dangers
inside it:
 Danger to life due to voltage-carrying electrical lines.
 Risk of injury for the fingers and risk of hair and loose clothing being
drawn in at the blower wheel of the pump.
Before opening the enclosure, disconnect the Cleaning Air Box from the
power supply and secure it against being switched on inadvertently.
Fig. 3-3 Check valve
1 Open the hose connection at the compressed air outlet. To do so, open
the coupling ring (pos. 1 in Fig. 3-3) and pull off the hose.
2 Shorten the bared hose end by 5 cm.
groove oriented towards
pressure side(pump)
shorten this hose
end by 5 cm
5 R2
R1
xxx
V A
C
L
N
4
3
2
1
1