Characteristics; Packing; Storage; Handling - WDV Molline DELTA Manual De Instrucciones

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 national rules for installation,
operation and service of gas meters.

1 Characteristics

Delta meters are designed to measure gases of
the 1st, 2nd and 3rd gas families as specified in
EN437 as well as various filtered and non-corro-
sive gases.
General characteristics: See Annex 1

2 Packing

• The meter, depending on the size or version is
delivered:
• In a cardboard box, protected by carton inserts
or polyethylene wedges.
On a wood pallet, protected by a cardboard cover.
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
environment, 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 cov-
ers. Before shipping or handling, ensure that the
lubricant has been thoroughly drained from the
front and the rear covers to prevent spillage into
the measuring chamber. Meters should be lifted
only with belt around the main body or with the
eyelets.

3 Installation

3.1 General

Due to the volumetric principle of the Delta me-
ter, its metrology is not influenced by the instal-
lation conditions. Nevertheless the respect of the
4
WDV / Molliné GmbH · Mönchstraße 11 · 70191 Stuttgart · Tel. 0711 / 35 16 95 - 20 · Fax 0711 / 35 16 95 - 29 · www.molline.de
following rules will insure the best use of your
Delta meter:
Recommended installation: See Annex 2
• Check visually that the meter has not been
damaged during transport.
• No welding is allowed with meter installed.
• The meter should be installed with the impellers
horizontal. 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 water or particles.
• For threaded joints, the use of Teflon tape is not
recommended to avoid introducing tape in the
chamber.
• The meter should be installed without stress in
the piping. The flanges must be correctly lined
up. The tightening torque of the bolts must not
exceed 40Nm for M12, 100Nm for M16,
150Nm for M20.
• Please tighten bolts in opposite pairs
• A flexible coupling can be used to ensure a
stress-free installation.
• The use of a filter, placed upstream of the me-
ter, is advisable 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.

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 cleanliness of the filter, especially in the case
of a new installation or after work has been per-
formed on the upstream piping.

3.3 Lubrication

3.3.1 General
Choose the lubricant according to the operating
conditions. This lubricant should be neutral and
non detergent. Important: