Accessories; Electrical Accessories; Low Frequency Transmitter (Furnished As Standard); Anti Tampering - DRESSER Delta Serie Mode D'emploi

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 centre
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 cover; the
lowest one must be used for draining . Depending of the ori-
entation of the meter, one level point "L1" or "L2" must be
used to adjust the level of oil i . e . unscrewed 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 .

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,
according to EN 60079-0 and EN 60079-11 .
• Clean the meter head only with a damp cloth .
• All exposed aluminium parts must be suitably protected (us-
ing 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 eval-
uation of the complete installation .
• Tools used for installing, removing or repairing the meter on
site must be appropriate for use in the hazardous area bear-
ing in mind that the hazardous area classification during me-
ter replacement may differ from that during normal meter
operations .
• The meter shall not be exposed to flame, ionising radiation,
ultrasound or strong electromagnetic field .
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 normally open .
See the name plate of the meter and Annex 4 for connection
information .

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 transmitter . 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 frequency
transmitters . There are inductive sensors, and connection 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 pipe . It is recom-
mended to remove it after approximately 4 to 8 weeks of op-
eration .

4.3 External dryer cartridge

The meter can be equipped with an external silicagel cartridge
for installation in severe environment conditions . To replace
the cartridge, unscrew the old cartridge, remove the protective
plug of the new cartridge and screw it into the totaliser .

4.4 Flow limiters

Flow limiters are recommended to be used to protect the me-
ter against over-flows or pressure pulses caused by not perfect
installation layout

5 Start-up

5.1 General

The procedure of start-up is always dependent on the installa-
tion configuration .
Before pressurising the meter, the lubrication procedure should
be performed . Pressurisation or depressurisation should be car-
ried 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 ver-
ified by a visual control of the totaliser (to check that the meter
runs properly) and by measuring its pressure 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) .

5.2 Installation with by-pass:

See Annex 5
START-UP:
Begin with all valves closed .
• Slowly open the by-pass valve to pressurise the downstream
piping .
• When the pressure is balanced downstream, slowly open the
small upstream valve V1 . The pressure variation should not
exceed 0 . 3 bar per second .
• When the pressure is balanced in the meter, slowly open the
main upstream valve and then close V1 .
• Slowly open the downstream valve and check that the meter
starts to register the flow .
• Gradually, close the by-pass valve . Check that the flow rate
doesn't exceed the capacity of the meter .
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