LumaSense Technologies INNOVA 1303 - Manual (Page 31)

Chapter 3
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BE1085-14
1303 Multipoint Sampler and Doser LumaSense Technologies A/S
Page 31 of 60
Alternatively, the gas constant can be expressed in terms of the molec-
ular weight of the gas:
MOL_WEIGHT 146,05 Sends the gram molecular weight
146,05 (for SF
6
) to the 1303.
The current characteristic gas constant or molecular weight value (de-
pending on how you have previously expressed the gas constant to the
1303) can be checked using the following jobs:
GAS_CONSTANT? Outputs the current gas constant
value from the 1303.
MOL_WEIGHT? Outputs the current molecular
weight value from the 1303 in kg
kmol
-1 (equivalent to g mol -1 ).
Table 3.2. Molecular weight of commonly used Tracer-gases
Tracer Gas M R /
M
Molecular Weight
g/mol = kg/kmol
Characteristic Gas
Constant
SF
6
146.05 56.92
Freon 134a 102.03 81.49
Freon 152 66.05 125.87
CO
2
44.01 188.91
N
2
O 44.01 188.91
3.3.3 The Calibration Data Parameter
This specifies the effective outflow area (in m 2 x 10 -9 ) of a specific dos-
ing nozzle, thus allowing the 1303 to automatically calculate the
amount of tracer-gas delivered during a dosing procedure. The 1303 is
able to calculate these values automatically for each dosing nozzle
when calibrating itself – see section 3.4 for further information. A dos-
ing nozzle cannot be used until it is calibrated with the tracer-gas to be
used.
The range of values is from 0,1 to 100,0; there is no default value for
this parameter.
If the calibration data for each specific nozzle and for the tracer-gas
currently being used is known, it can be sent directly to the 1303 using
the following job, without calibrating the 1303. Note that the 1303’s
doser nozzles must still be calibrated with each change of tracer-gas,
so that the 1303 is able to calculate the amount delivered.