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Installation
40
3.5.2
Install the parts in the following order starting from the compressed air
source: manually actuated valve - reducing valve - HYGROPHIL
A maximum of 12 bar is allowed in the compressed air supply line upstream
of the reducing valve.
The compressed air coupling supplied with HYGROPHIL
H 4230 can also be attached to the unit's compressed air con-
nector stub for connecting a 9 mm compressed air hose.
Setting the ejector's operating pressure
The gas to be measured is extracted from the respective system using the
ejector and pumped through the measuring unit. The ejector is operated with
compressed air.
The operating pressure of the compressed air must be set in line with the
pressure at the extraction point. The lower the pressure in the customer sys-
tem, the higher it is necessary to set the pressure.
Maximum efficiency of the ejector is obtained at a pressure of 5 bar. The
negative pressure in the customer system compared to the pressure in the
measurement station must not exceed 250 hPa.
Flow resistances occur in the hose and filter and these are intensified further
by dirt. For this reason, the maximum permissible negative pressure allowed
to be set is 200 hPa. This also provides leeway in terms of longer mainte-
nance intervals.
The air pressure should be at least 2 bar. This ensures that sufficient re-
serves are available should the flow resistance be increased by dirt.
A maximum excess pressure of 5 hPa is permitted at the extraction point.
This can be influenced by choosing the extraction point well (e.g. extraction
before rather than after a blower).
In cases of excess pressure or a negative pressure of more than -200 hPa, it
is possible to check whether it would be permissible to run the unit's outlet
back to the customer system. HYGROPHIL then works neutrally in terms of
pressure. Ask for advice if required.
Operating Instructions HYGROPHIL® H 4230-12 BA 060207
H 4230.
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