Maintenance; Lubrication; External Silicagel Cartridge; Inspection And Repair - WDV Molline MZ Manual De Instrucciones

may differ from that during normal me-
ter operations.
• The meter shall not be exposed to flames,
ionising radiation, and ultrasound.
• Pulse values and maximum frequen-
cies are given in Annex 1. Electrical
characteristics and wiring of the socket
are given in Annex 4. The wiring of the
transmitters is written on the name plate
of the meter.

5 Maintenance

When properly installed and put into ser-
vice, the MZ need no particular attention
and will provide you with many years of
satisfactory service.

5.1 Lubrication

Meters equipped with an oil pump have to
be periodically lubricated. Oil is delivered
with the meter. Specific oil has to be used,
for example
• Aeroshell fluid 12 MIL6085A
• Isoflex PDP38 (Klüber)
• Anderol 401D (Mobil Oil)
• Univis P38 (Shell)
Quantity of oil to be filled:
a) On commissioning to fill the volume
between the pump and the bearings
DN Oil vol. (cm
50/80 4
100 5
150/200 6
6
WDV / Molliné GmbH · Mönchstraße 11 · 70191 Stuttgart · Tel. 0711 / 35 16 95 - 20 · Fax 0711 / 35 16 95 - 29 · www.molline.de
) Push
3
20
25
30
b) In Service
DN Oil vol. (cm
50/80 0,5
100 0,8
150/200 1,0
c) Recommended lubrication periodicity
Application Lubrication periodicity
Dry gas, no dust 6 months
Gas comprising Monthly
light condensates
and little dust
Gas with high Weekly
percentage
of condensates
and dust.
BIOGAS
applications

5.2 External silicagel cartridge

The meter can be equipped with an ex-
ternal silicagel cartridge for installation in
severe environment conditions. The car-
tridge has to be replaced when its colour
has changed. To replace the cartridge,
unscrew the old cartridge, remove the
protective plug of the new cartridge and
screw it into the totaliser.

5.3 Inspection and repair

It is possible to check the good function-
ing of the MZ by applying a spin test. This
test will give information about eventual
friction in the turbine ball bearings.
The test has to be conducted as follow:
• Accelerate the turbine wheel around 30
to 50% of Qmax then to measure the
time until the turbine wheel stops.
) Push
3
2-3
4
5