DRESSER Quantometer Delta QD Mode D'emploi page 6

3.3.2 Choice of lubricant
Viscosity: The viscosity has been calculated to en sure me-
chanical and metrological performance of the meter .
Commercial references: Annex 3 contains a list of com-
mercial lubricants usable for industrial gas except gases
such oxygen and halogens . For oth er gases, please con-
sult us .
3.3.3 Capacity of the cover:
Horizontal = 10 ml; Vertical = 30 ml
3.3.4 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 8 . Adjusting the level of oil:
General case: The level is correct when it passes the
centre of the lowest sight .
4 Accessories
4.1 Electrical accessories
Remarks about using the meter in potentially haz ardous
areas (ATEX):
• Pulse transmitters must be connected to intrinsic safe
circuits .
• Clean the meter head only with a a damp cloth .
• All exposed aluminium parts must be suitably protect-
ed (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 light ning
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 classifica-
tion during meter re-placement may differ from that
during normal meter operations .
• The meter shall not be exposed to flame, ioni sing radia-
tion, ultrasound or strong electroma gnetic field .
• Ambient temperature conditions must be con sidered,
including possible additional heating eff ects due to
other devices in immediate vicinity .
• Air clearance, creepage distance and dielectric strength
must be considered .
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
5 for connection infor mation .
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4.1.2 Anti tampering
The meter is delivered as standard with an anti tampe-
ring 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 5 . The Cyble sensor is a bounce-free
transmitter . It allows also the count ing of eventual back
flows .
4.1.4 High frequency transmitters (furnished as
option)
The meter can be delivered with high frequency trans-
mitters . There are inductive sensors, and connection is to
a NAMUR- type input circuit (EN 60947-5-6) .
4.1.5 Pulse values of LF, Cyble sensor and
HF transmitters: see Annex 1
4.2 External dryer cartridge
The meter can be equipped with an external sili cagel
cartridge for installation in severe environ ment conditi-
ons . To replace the cartridge, un screw the old cartridge,
remove the protective plug of the new cartridge and
screw it into the totaliser .
5 Start-up
5.1 General
The procedure of start-up is always dependent on the
installation configuration .
Before pressurising the meter, the lubrication procedure
should be performed . Pressurisation or depressurisation
should be carried out with very low pressure change .
The pressure change should not exceed 0 . 3 bar/5 P . S . I .
per second . After start-up, please check the tightness of
the installation .
The proper installation and functioning of the meter can
be verified by a visual control of the totaliser (to check
that the meter runs properly) and by measuring its pres-
sure loss while running though the use of Pete's Plugs
may allow this pressure loss to be measured while the
meter is pressurised (up to 20 bar) .