Wigersma & Sikkema UNIGAS 300, Installation, Operating And Maintenance Manual

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Installation, operating and maintenance manual UNIGAS 300
DDG6004MHGB/08-2017/Rev.A2 Software version from M 1.3.40 and D 2.3.37 7
3.2 Conversion functions
UNIGAS 300 has three inputs of which input 1 can be configured for connecting a gas meter with an LF impulse
output, an HF impulse output or an encoder output.
Inputs 2 and 3 are only suitable for connection of a gas meter with an LF impulse output.
Several counters are connected to the three inputs. Counters for correcting the gas meter measuring error and
counters for conversion are connected to input 1.
Figure 3 shows the interrelations between conversion and other functions. Chapter 10 contains a further
explanation of all counters and registers present in UNIGAS 300.
status bit
1.10: external_supply
1.11: reset
service registers:
U_batt
AH_new
AH_used
operation
status bit
1.0: empty_battery
2.13: battery_exchanged
alarm Vm2 - Vm1
status bit
3.8: alarm_input_1
status bit
3.9: alarm_input_2
supply
control
external supply
battery
status
gas meter:
LF
Gas meter:
LF
Vm3 INP3DIV
alarm contact 2
alarm contact 1
INP2DIV
status bit
1.9: alarm_Encoder
LF3 input
LF2 input
Vm2
status register 1, 2, 3
bit 0..n
status register 1, 2, 3
bit 0..n
switch
alarm output 2
3 x 16 positions
alarm output 2
alarm output 1
status bit 1.5:
alarm_programming_switch
programming switch
tamper switch
status bit 1.4:
alarm_open_casing
Status bit
2.12: alarm_volume_difference
Vc1_60
Out1_div
Vb1
Vb1 err
Vm1
Vc1
Vm2
Vm3
impulse output 1
Out2_div
Vb1
Vb1 err
Vm1
Vc1
Vm2
Vm3
switch
alarm output 1
3 x 16 positions
switch
impulse output 2
6 positions
impulse output 2
statusbit 3.7:
warning_Vc1_60
warning
Vc1_60
switch
impulse output 1
6 positions
alarm
Vc1_60
status bit 3.6:
alarm_Vc1_60
warning
p max
warning
p min
warning
t max
metrological limits:
pmin, pmax
tmin, tmax
warning
t min
error curve correction
(lineair interpolation)
LF, Encoder: Cf=1
HF: Cf1 @ Qf1(Qmin gas
meter)
Cf2 @ Qf2
.................
Cf9 @ Qf9
Cf10 @ Qf10 (Qmax gas
meter)
T,p
p meter
T meter
Gas meter:
LF,
HF,
Encoder
Gasmeter
status bits
1.7: NAMUR_short_circuit
1.8: NAMUR_interruption
INP1DIV
Encoder
decoder
INP1DIV
NAMUR input
Vm1 Vc1
LF1 input
switch
Input_1
4 positions:
-Enoder to Vm2
-LF
-HF
-Encoder
Gas meters under
measuring conditions
status bit
2.4: warning_p_min
status bit
2.7: warning_t_max
tmeasure
adjustment:
p_offset
tcorr_min
tcorr_0
tcorr_max
status bit
2.5: warning_p_max
status bit
2.6: warning_t_min
switch
flow rate
determination
4 positions:
n= 2, 3, 6, 12
x 5 minutes
Qc1_nx5
Qb1_nx5 Qb1_5
Cf
Vb1_err
Qb1_inst Qc1_inst
Vc1_err
Qc1_5
Vb1_60
Vb1
C = p/pb x Tb/T
x Zb/Z
status bits
1.2: alarm_pressure
1.3: alarm_temperature
2.14: error_p_of_t
2.9: alarm_p_max
2.8: alarm_p_min
2.11: alarm_t_max
2.10: alarm_t_min
p, t A/D converter
p,t
C
Z/Zbfix
alarm
Qb1_nx5
status bit 3.0:
alarm_Qb1_nx5
status bit 3.1:
warning_Qb1_nx5
status bit 3.5:
warning_Qc1_nx5
status bit 3.3:
warning_Vb1_60
status bit 3.4:
alarm_Qc1_nx5
alarm
Vb1_60
warning
Vb1_60
alarm
Qc1_nx5
warning
Qc1_nx5
warning
Qb1_nx5
status bit 3.2:
alarm_Vb1_60
statusbits
2.15: fout_in_Zb
1.1: fout_in_Z_of_Zb
calculation of Z
and Zb
gas parameters:
CO2, H2,N2,
d, Hs
tb, pb
pfix, tfix
Z
Z/Zb
Figure 2. Functions in block diagram
When using a gas meter with two LF impulse outputs, receipt of the impulses of one of the impulse outputs
can be checked. For that purpose the counter readings of input 2 are compared with those of input 1. Also see
chapter 13.
When using a gas meter with both an LF impulse output and an encoder output, receipt of the LF impulses
can be checked with the aid of the encoder. For that purpose the LF impulse output of the gas meter is
connected to input 1 of UNIGAS 300, whereas input 2 is configured for connecting the encoder output of the
gas meter. In this application the encoder counter is only read out once every 5-min interval in order to reduce
the energy consumption and to extend battery life.
Dependent on the version, T, TZ, PT and PTZ (see main label), the conversion is carried out as follows: