Diaphragm Gas Meters Bk With Integrated; Smart Valve; Smart Valve" Valve Function; Maintenance/Removal - Elster BK-G Series Operating Instructions Manual

Diaphragm gas meters BK with integrated

"Smart Valve"

In the event that the diaphragm gas meter BK is fitted
with an integrated "Smart Valve", see „Type label/
Index plate" auf Seite 2, the gas supply can be con-
nected
or disconnected remotely.
WARNING
The network provider is responsible for the safe
remote shut-down and restart of the diaphragm
gas meter:
– The "Smart Valve" does not assume the safety
functions of a safety shut-off valve.
– Depending on national regulations, a limited and
technically safe gas flow rate in the customer's
open consumer piping is allowed, see [Technical
data – p. 5].
– Assessment of the non-critical gas flow rate with
regard to amount and duration, which occurs
when the valve is released, is to be defined by
the network provider.
– The minimum operating pressure on the inlet
must not be undershot, see [Technical data – p. 5].
Otherwise, when the valve is released and if the
customer's consumer piping is open at the same
time, the valve may be completely opened.

"Smart Valve" valve function

The "Smart Valve" is switched remotely by the data
management system. The valve first switches to the
"Released" position. From the "Released" position, the
valve automatically switches to the "Open" position,
if the downstream installation is tight.
Released
The "Smart Valve" opens an internal bypass and
releases a minimum gas flow into the customer's
closed consumer piping. Pressure equalization takes
place between the inlet and outlet side of the valve.
Open
Following pressure equalization, the valve automati-
cally opens by spring force and fully releases the
gas supply. If consumers of the customer are open,
pressure equalization cannot occur and the valve
remains in the "Released" position and continues to
release only the minimum gas flow rate of the bypass.
Closed
The valve and the bypass are closed in the event of
remote shut-down.
▷ All valve positions are kept de-energized. ▷

Maintenance/Removal

Gas meters BK-G1.6 to 25 from Elster are mainte-
nance-free.
▷ When used for custody transfer measurements, ▷
recalibration must be carried out in accordance
with national Directives.
▷ If the screw unions are loosened for maintenance ▷
work or retesting, replace the seals.
▷ After the gas meter has been removed, immedi- ▷
ately close the connectors with protective caps,
in order to prevent an ingress of dirt particles.
WARNING
A certain amount of gas may remain in the gas
meter. Taking into consideration the risk of explo-
sion, it is important to adopt safety measures, e.g.:
– Following removal of the gas meter, purge it thor-
oughly with inert gas.
– For transporting the gas meter with gas residue,
use a vehicle with an open or a ventilated loading
area.

Technical data

Diaphragm gas meters BK
Gas type: natural gas, town gas, propane and butane,
as gases of the first to third families pursuant to
DIN EN 437:2003 (DVGW Code of Practice G260).
Max. allowable operating pressure p
[Type label/Index plate – p. 2].
Max. allowable measuring range Q
[Type label/Index plate – p. 2].
Max. allowable ambient temperature range t
[Type label/Index plate – p. 2].
Max. allowable storage temperature range: -25 to
+60°C.
Gas temperature t
lies within the error limits set out in the Directive, see
[Type label/Index plate – p. 2]. If no gas temperature
t is specified on the index plate, t
g
Diaphragm gas meters BK with pressure test
point
Pressure test point: 24° olive fitting to EN ISO 8434-1,
L6 x M12 x 1.5-St
Diaphragm gas meters BK with explosion
protection
Max. allowable ambient temperature range t
temperature range t
see [Type label/Index plate – p. 2].
GB-5
, see
max.
/Q
min. max.
, where the measuring error still
g
= t applies.
g m
: -20 to +55°C, for constraints
g
, see
, see
m
/gas
m