Maintenance/Removal; Technical Data - Elster BK-G1.6 Operating Instructions Manual

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 auto-
matically 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.
– The indexes must not be opened in an explosion-
hazard area even for maintenance and repair.
Opening of the service cover on the electronic
index, e.g. to change the battery, is permitted –
see operating instructions for "Electronic index
for diaphragm gas meters BK..E".

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
label/index plate.
Max. allowable measuring range Q
type label/index plate.
Transitional flow rate Q
Max. allowable ambient temperature range t
type label/index plate.
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. If no gas temperature t
specified on the index plate, t
Cyclic volume V, see type label/index plate.
Base temperature t
conversion only), see type label/index plate.
Specified centre temperature t
perature conversion only), see type label/index plate.
For BK..E.., the cyclic volume V and the specified
centre temperature t
plate, but can be called up in the display using the
menu.
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.
Diaphragm gas meters BK with integrated
"Smart Valve" Vs
Not suitable for highly contaminated gases, e.g.
town gas.
Opening time from closed to open/released state:
≤ 4 s,
closing time: ≤ 0.5 s.
Min. operating pressure: 17.5 mbar.
Allowed leakage flow in the customer's piping:
valve released: max. 13 l/h at 35 mbar,
valve closed: max. 5 l/h.
GB-6
, see type
max.
/Q
min.
= 0.1 x Q .
t max.
, where the measuring error still
g
= t applies.
g m
(for meters with temperature
b
(for meters with tem-
sp
are not stated on the index
sp
: -25 to +55°C; for constraints,
g
, see
max.
, see
m
is
g
/gas
m