Model 750 Gas Meter
Installation, Commissioning and Maintenance Manual
Page 10 of 17
© Gyr
17-May-2016
Due to continuous product development the details above are subject to change without notice. Whilst Gyr has taken all reasonable
care in reviewing the information in this document, Gyr makes no representations in respect of, gives no guarantees or undertakings in
relation to, and to the maximum extent permitted by law, excludes all warranties in relation to, the accuracy or completeness of the information
in this document. Prospective users of this information should make their own enquiries as to its accuracy and reliability.
inspections should be conducted as and when
required.
Additional inspections maybe necessary for example
natural disasters, earthquakes, floods, landslides,
house fires etc.
When the meter is used in adverse environments or
with gases high in contaminants more frequent
inspections should be conducted.
SUITABLE GASES
Model 750 Gas Meter and 300 Series Domestic
Regulators are suitable for use with a variety gases
such as:
Natural Gas,
Methane,
Liquefied Petroleum Gas (LPG),
Town Gas (TG),
Butane,
Propane,
Nitrogen,
Carbon Dioxide (dry),
Carbon Monoxide (dry),
Aliphatic Hydrocarbons,
Air
and inert gases
For gases not listed please consult Gyr.
BIO-GAS
Biogas is generated when bacteria degrades
biological material in the absence of oxygen, in a
process known as anaerobic digestion. Biogas is
produced from marshes, rubbish dumps, septic tanks
and waste treatment plants. Biogas consists of large
quantities of carbon dioxide, hydrogen sulphide and
water. Therefore the service life will be dramatically
affected accordingly.
WARNING! PURE OXYGEN
All regulators and meters supplied by Landis + Gyr
are
NOT SUITABLE
for pressure regulating or
measuring
PURE OXYGEN
. Special meters and
regulators made from specific materials are required
to prevent heat build up as a result of friction etc.
SERVICE LIFE
– INTERNAL CORROSION
Service life varies according to deleterious effects of
the specific gas, the level of filtration and any
contaminants in the gas stream. For example gases
containing water, sulphur, nitrous oxides and carbon
dioxide can accelerate corrosion to an unacceptable
level. Seemingly innocuous gases, under certain
conditions, are surprisingly corrosive capable of
producing such compounds as carbonic acid,
sulphurous acid and sulphuric acid. Nitrous oxides
(NOx) attack rubber and plastic components.
METER BAR OPTIONS
An optional meter bar is available for wall or pole
mounting of a meter and / or regulator off the ground.
The meter bar comes with two models 503700
(without plug cap) and 503800 (with plug cap)
Meter Bar (503800)
Table 5 : Domestic Meter Bar Options
Part Number 503700
3 x Cap Nuts ( p/n 138 )
3 x ¾” Liners ( p/n 503606 )
3 x 26e Washers ( p/n 26 )
1 x ¾” BSP Female to 10 Lt. Male Adaptor (p/n 503-6)
Part Number 503800
3 x Cap Nuts ( p/n 138 )
3 x ¾” Liners ( p/n 503606 )
3 x 26e Washers ( p/n 26 )
1 x ¾” BSP Female to 10 Lt. Male Adaptor (p/n 503-6)
1 x Plug Cap( p/n 000209 )
METER CONNECTION OPTIONS
The meter boss threads are vertical inlet/outlet 10
Light 1” to BS746 1987 at 152.4mm ( 6” ) centres.
There are a variety of meter connection kits available.
The standard kit is a
1” 10 Lt. Cap Nut to ¾” BSP
Liner set as detailed below.
Table 6 : SK5 Connection Kit
Part Number SK5
2 x Cap Nuts ( p/n 138 )
2 x ¾” BSP Liners ( p/n 144-1 )
2 x 26e Washers ( p/n 26 )
