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Dosaodor-D
Volumetric Measure
(with meter connected to HF Emitter)
Follow the parameters below to calculate the "weight" of
the pulse:
•
Max. flowrate of the Biggest Meter = Qmax
•
Max. measured gas pressure [bar] (PSIG) = Pmax
•
C = (Qmax x (Pmax + 1) / 1200) (one integration of
volume each 3 seconds is considered)
Venturimetric Measure
Follow the parameters below to calculate the "weight" of
the pulse:
•
Max. flowrate of the station [Sm3/h] (MCF) = Qmax
•
C = (Qmax / 1200) (one integration of volume each
3 seconds is considered)
The value to be set in the Dosaodor-D control unit must
be higher or equal to C" value calculated as above (it is
usually rounded to higher tenths. E.g.: 1,00 or 10,00 or
100,00)
The pulse coming of the flow computer MUST HAVE the
same "weight" set in the Dosaodor-D control unit. Not
all computers require the same parameters, since some
express the output pulse as 1 pulse = m
others 1 m
3
(MCF) = pulses.
On the FLOWTI T502/3/4/5 computer series it is necessary
to program the location called OUT 1m
(Attention! It is necessary to enter the corresponding num-
ber of calculated "C" value.
Example:
C = 10.00; OUT 1m
3
= PULSE 0.100)
If the Gas Flowrate is detected via analog input
Enter the max. gas volume that can be supplied by the
station within 3 seconds.
Example:
Max. Station Flowrate = 20,000 Sm
Computer: (Qmax / 3600 / 3) 20,000 / 1200 = 16.666
(Computer: (Qmax / 3600 / 3) 706 / 1200 = 0.5883)
Enter an integer greater than the calculated value:
1 Pulse = m
20.0 (1 Pulse = MCF 0.600)
3
c) Gas Flowrate (Manual) m
It is advisable to enter a value lower than the average
flowrate of the station and, in case of need, enter the
desired value. In case the MANUAL mode is mistakenly
switched on, a low gas flowrate value reduces the odorant
injection (usually this situation does not cause any
particular problem, provided that it does not last too long).
To correctly calculate this value, it is recommended to set
the daily average gas flowrate supplied by the station.
32
(MMCF) and
3
3
= PULSE x.xxx
3
/h (706 MCF/h)
3
/h
Example:
Daily volume of the period = 204000 Sm3/g (7201 MCF/Day)
Divide this value by the 24 hours of the day to calculate
the average hour flowrate to be set:
204000/24 = 8500 Sm
Loc:02
a) Specific Volume Inject. n1 g/s (lb/s)
Enter the specific volume of Injector No. 1. This value
is indicated on the identification plate located on the
pneumatic panel of the system. This value is automatically
re-calculated by the system after each emptying cycle of
the odorant contained in the control cylinder.
After approx. 7 operating days, this location takes a
characteristic value, that depends on the system, since
it depends of the variables identifying each type of
installation. Keep this value constantly monitored. If it
decreases, it means that the injection valve is getting
dirty. If it increases, it means that the filling control valves
are not perfectly tight. In any of these cases, it is better to
schedule a maintenance intervention on the system.
b) Specific Volume Inject. n2 g/s (lb/s)
(only on dual injector version)
Enter the specific volume of Injector No. 2. This value
is indicated on the identification plate located on the
pneumatic panel of the system. This value is automatically
re-calculated by the system after each emptying cycle of
the odorant contained in the control cylinder.
After approx. 7 operating days, this location takes a
characteristic value, that depends on the system, since
it depends of the variables identifying each type of
installation. Keep this value constantly monitored. If it
decreases, it means that the injection valve is getting
dirty. If it increases, it means that the filling control valves
are not perfectly tight. In any of these cases, it is better to
schedule a maintenance intervention on the system.
c) Odorant Volume in the Control Cylinder g (lb)
This location indicates the odorant volume used by the
control device to compare the liquid actually injected with
the theoretically injected liquid. This value is indicated on
the identification plate located on the pneumatic panel,
and should be multiplied by the specific weight of the
odorant used. THT = 1kg/dm
Mercaptan = 0.8 kg/dm
Loc:03
a) Volume for |1↔|2 exchange g (lb)
In the case of No. 2 Injectors installed on a type
Dosaodor-D B2, this location should include the volume
that each injector has to inject before the automatic
exchange between "operating/rest" cycle takes place.
3
/h (7201/24 = 300 MCF/h)
3
(8.345 lb/gallon)
3
(6.676 lb/gallon)
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