Characteristics; Packing; Storage; Handling - ITRON Dresser DELTA Mode D'emploi

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-corrosive gases (e . g . Oxygen) .

2 Packing

• The meter, depending on the size or version is delivered:
• In a cardboard box, protected by carton inserts or polyeth-
ylene 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 covers . 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 meter, its metrol-
ogy is not influenced by the installation conditions . Never-
theless the respect of the following rules will insure the best
use of your Delta meter:
Recommended installation: See Annex 1
• Check visually that the meter has not been damaged dur-
ing transport .
• No welding is allowed with meter installed .
• The meter should be installed with the impellers horizon-
tal . Allowed deviation: +/- 5° .
• Never install a meter at a low point in the piping where
the meter could be subject to the accumulation of water
or particles .
• If Teflon tape is used to tight threaded joint then the best
attention must be taken to avoid introducing tape in the
measuring chamber .
• The meter should be installed without stress in the piping .
The flanges must be correctly lined up .
• The meter should be considered in a possible grounding
system
4
• On flanges with UNC screw-thread, the threads are NOT
metric but defined in inch following ANSI/ASME B1 . 1 –
1989 .
Metric threads and threads defined in inch are not
compatible!
• Please tighten bolts in opposite pairs
• A flexible coupling can be used to ensure a stress-free in-
stallation .
• The use of a filter, placed upstream of the meter, is advis-
able in gas with high particulate content . 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 corresponds with the
arrow situated on the meter body .
• Check that the impellers turn freely .
• Possible accessories to be assembled onto the meter must
not interfere its corrosion protection .

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 cleanli-
ness of the filter, especially in the case of a new installation
or after work has been performed on the upstream piping .
For installation with flow direction from bottom to top a par-
ticular attention has to be taken to the filtering conditions to
avoid that accumulation of dust downstream of the meter
may come back into the meter . For example a second filter
can be installed downstream of the meter .

3.3 Lubrication

3.3.1 General
Choose the lubricant according to the operating conditions .
This lubricant should be neutral and non detergent . Impor-
tant:
• A lack of lubricant could cause premature wear of the me-
ter .
• An excess of lubricant can also induce problems . A surplus
of lubricant can contaminate the measuring chamber, 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 commer-
cial lubricants usable for industrial gas except gases such oxy-
gen and halogens . For other gases, please consult 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 .