Honeywell BCU 465 - Measurement Time for; Valve Opening Time T L1

BCU 460, BCU 465 · Edition 11.19 101
Parameters
11.9.3 Measurement time for V
p1
Parameter A056
The required measurement time must be determined
according to the requirements of the appropriate appli-
cation standards, e.g. EN1643.
BCU 56x..C1
µ
C
P
6
1
60
38
p
u
/2
TC
PZ
>750°
ϑ
1
2
3
p
u
/2
PZ
V
p1
V1 V2
The required measurement time for the tightness test
of V
p1
can be set using parameterA056. The possible
settings are 3s, 5 to 25s (in 5s steps) or 30 to 3600s
(in 10s steps).
See also page45 (Measurement time tM).
11.9.4 Valve opening time t
L1
Parameter A059
This parameter is used to define the opening time for
the valves (2 to 25s) which are opened to fill or dis-
charge the test volume between the gas valves. If the
preset opening timet
L
= 3s is inadequate (e.g. if slow
opening valves are used) to fill the test volume or re-
duce the pressure between the valves, bypass valves
can be used instead of the main valves.
On condition that the gas volume which flows into the
combustion chamber is no larger than 0.083% of the
maximum flow rate, the opening time of the bypass
valves may be longer than the 3s permitted by the
standard (EN1643:2000).