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Keep this manual easily accessible for all users . Ask for
a written approval of the manufacturer for all cases not
planned in this instruction manual . Please respect all na-
tional rules for installation, operation and service of gas
meters .
1 Characteristics
Delta QD meters are designed to measure gases of the
1st, 2nd and 3rd gas families as speci fied in EN437 as
well as various filtered, not ignition-capable and non-
corrosive gases .
General characteristics: See Annex 1
2 Packing
The meter is delivered in a cardboard box, protected by
carton inserts .
The packing shall contain the filling lubricant, plugs for
the installed transmitters and this instruction manual .
2.1 Storage
If the meter is not going to be used immediately, it
should be stored under cover in a clean, dry environ-
ment, in the horizontal position .
The caps fitted in the inlet and outlet pipe must stay in
place until installation .
2.2 Handling
The meter is delivered without lubricant in the cov er .
Before shipping or handling, ensure that the lubricant
has been thoroughly drained from the front cover to
prevent spillage into the measuring chamber .
3 Installation
3.1 General
Due to the volumetric principle of the Delta QD meter, its
metrology is not influenced by the in stallation conditions .
Nevertheless the respect of the following rules will insure
the best use of your meter: Recommended installation:
See Annex 2
• Check visually that the meter has not been dam aged
during transport .
• Check additionally ease of movement by blowing it
on, prior to installation in the pipeline .
• No welding is allowed with meter installed .
• The meter should be installed with the impellers hori-
zontal . Allowed deviation: +/- 5° .
• Never install a meter at a low point in the piping where
the meter could be subject to the accu mulation of wa-
ter or particles .
• If Teflon tape is used to tight threaded joint then the
best attention must be taken to avoid intro ducing
tape in the measuring chamber .
• The meter should be installed without stress in the
piping .
• The use of a filter, placed upstream of the me ter, is ad-
visable in gas with high particulate con tent . See § 3 . 2 .
Before installation:
• The piping upstream of the meter should be free of
dust .
• Remove the protective caps .
• Ensure that the direction of gas flow corre sponds with
the arrow situated on the meter body .
• Check that the impellers turn freely .
• Possible accessories to be assembled onto the meter
must not interfere its corrosion protection .
• Prior the use with combustion gases an inertization
must happen
3.2 Filtration
Rotary meters work better if there are no particles within
the gas . It is advisable therefore to filter the gas upstream
of the meter . Recommended level of filtration is 100 μm
or better .
While the meter is in service, periodically check the cle-
anliness of the filter, especially in the case of a new ins-
tallation or after work has been per formed on the ups-
tream piping .
For installation with flow direction from bottom
to top a particular attention has to be taken to the
filtering conditions to avoid that accumulation of dust
downstream of the meter may come back into the meter .
For example a second filter can be installed downstream
of the meter .
3.3 Lubrication
3.3.1 General
Choose the lubricant according to the operating con-
ditions . This lubricant should be neutral and non deter-
gent . Important:
• A lack of lubricant could cause premature wear of the
meter .
• An excess of lubricant can also induce prob lems . A
surplus of lubricant can contaminate the measuring
chamber, may degrade the metrol ogy and cause dam-
age to the bearings and the impellers due to the mix-
ture of lubricant and small impurities contained in the
gas .
• Always drain the end-covers before moving the meter .
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