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3.3 Lubrication
3.3.1 General
Choose the lubricant according to the operating condi-
tions This lubricant should be neutral and non detergent
Important:
• A lack of lubricant could cause premature wear of the
meter
• An excess of lubricant can also induce problems A sur-
plus of lubricant can contaminate the measuring cham-
ber, may degrade the metrology and cause damage to
the bearings and the impellers due to the mixture of
lubricant and small impurities contained in the gas
• Always drain the end-covers before moving the meter
3.3.2 Choice of lubricant
Viscosity: The viscosity has been calculated to ensure me-
chanical and metrological performance of the meter
Commercial references: Annex 2 contains a list of com-
mercial lubricants usable for industrial gas except gases
such oxygen and halogens For other gases, please con-
sult us
3.3.3 Filling and draining procedure
See Annex 4 for the location of fill, drain plug and sights
Filling and draining operations should be carried out with
the meter installed in the piping, but not pressurised,
though the use of Pete's Plugs may allow lubricant levels
to be "topped up" while the meter is pressurised (up to 20
bar) See Annex 7
Both front and rear covers must be filled with lubricant,
except for the Delta Compact, SE, Evo and S1-Flow for
which only the front cover must be filled
Adjusting the level of oil:
General case: The level is correct when it passes the cen-
tre
of the lowest sight
Steel-bodied meters: The lubricant must be filled until it
flows out of the level point "L"
• DN50 S1-Flow: Only the front cover must be filled with
oil 4 plugs "F" or "D" are available to Fill or Drain the co-
ver; the lowest one must be used for draining Depen-
ding of the orientation of the meter, one level point "L1"
or "L2" must be used to adjust the level of oil i e unscre-
wed before the filling The lubricant has to be filled in
"F" until it flows out of the level point "L", only the lowest
level point must be used to adjust the level of oil
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4 Accessories
4.1 Electrical accessories
Remarks about using the meter in potentially hazardous
areas (ATEX):
• Pulse transmitters must be connected to intrinsic safe
circuits
• Clean the meter head only with a damp cloth
• All exposed aluminium parts must be suitably protec-
ted (using paint, varnish, etc) if a film of rust is possible
from dust in the environment
• The meter must be taken in account in the lightning
risk evaluation of the complete installation
• Tools used for installing, removing or repairing the me-
ter on site must be appropriate for use in the hazardous
area bearing in mind that the hazardous area classifi-
cation during meter replacement may differ from that
during normal meter operations
• The meter shall not be exposed to flame, ionising radia-
tion, ultrasound or strong electromagnetic field
• Ambient temperature conditions must be considered,
including possible additional heating effects due to
other devices in immediate vicinity
4.1.1 Low frequency transmitter (furnished as
standard)
The meter is normally delivered with a double LF pulse
output transmitter The LF is a dry reed switch and is nor-
mally open See the name plate of the meter and Annex
4 for connection information Air clearance, creepage dis-
tance and dielectric strength must be considered
4.1.2 Anti tampering
The meter is delivered as standard with an anti tampering
switch It is a dry reed switch and is normally closed See
the name plate of the meter for connection details
4.1.3 Cyble sensor
A Cyble sensor can be installed onto the totaliser at any
time, see Annex 4 The Cyble sensor is a bounce-free trans-
mitter It allows also the counting of eventual back flows
4.1.4 Medium & high frequency transmitters
(furnished as option)
The meter can be delivered with medium or high frequen-
cy transmitters There are inductive sensors, and connec-
tion is to a NAMUR- type input circuit (EN 60947-5-6)
4.2 Gasket-Filter
A "Gasket-filter" can be inserted directly upstream of
flanged meters at the place of the standard gasket: it is
a protection against particles remaining in the upstream
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