Elster 83 462 140, Operating Manual And Installation Instructions, Page: 28 / 126

Volume Conversion Device EK260
28 Elster GmbH
3.3 Pressure list
AD Designation / value Unit Access Address DC
p Pressure bar - 7:310_1 4
p.LW Lower warning limit pressure bar S 10:150 8
p.UW Upper warning limit pressure bar S 10:158 8
pMin Lower alarm limit pressure bar C 7:3A8_1 8
pMax Upper alarm limit pressure bar C 7:3A0_1 8
MRL.p Pressure meas. range lower limit bar C 6:224_1 8
MRU.p Pressure meas. range upper limit bar C 6:225_1 8
p.F Pressure substitute value bar S 7:311_1 8
pb Pressure at base conditions bar C 7:312_1 8
Md.p Pressure mode - C 7:317 7
Typ.p Pressure sensor type - C 6:223 8
SNp Serial no. of pressure sensor - C 6:222 8
Eq1p Coefficient 1 of pressure equation - C 6:280 8
Eq2p Coefficient 2 of pressure equation - C 6:281 8
Eq3p Coefficient 3 of pressure equation - C 6:282 8
p1Adj Adjustment value 1 for pressure bar C 6:260_1 8
p2Adj Adjustment value 2 for pressure bar C 6:261_1 8
Prog Accept pressure adjustment - C 6:259 2
p.Amb Air pressure fixed value bar C 6:212_1 8
p.Mes Pressure meas. bar - 6:211_1 4
p.Abs Absolute pressure measurement bar - 6:210_1 4
p.MP
Ø
Measurement period mean pressure bar - 19:160 16
p.Mon max Month's maximum pressure bar - 21:160 16
p.Mon min Month's minimum pressure bar - 22:160 16
(Legends: see page 22)
p Press.
p is the pressure which is used for computing the conversion factor (
→
3.5) and
hence the volume at base conditions (
→
3.1).
In disturbance-free operation the measurement p.Abs (see below) is used:
p = p.Abs.
With a relevant disturbance (alarm), the substitute value p.F (see below) is used:
p = p.F . In addition, disturbance quantities are then counted (
→
3.1, 3.2) and the
message "p Alarm Lim." displayed (
→
page 45 ). Relevant disturbances are:
−
p.Abs is located outside of the set limits pMin and pMax (see below).
−
With a connected encoder (Md.I1 = 5,
→
3.10) no actual volume can be
measured for more than 20 seconds. Since the gas flow variation is not known
for the time period and therefore no gas quantities can be assigned to the
measured values of pressure and temperature, the correction occurs as
disturbance quantities with substitute values for pressure and temperature.
(
→
4.5)