LumaSense Technologies INNOVA 1303 - Manual (Page 30)

Chapter 3
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BE1085-14
1303 Multipoint Sampler and Doser LumaSense Technologies A/S
Page 30 of 60
3.3.1 The Dosing Time-out Parameter
This value specifies the maximum time for which the 1303 will deliver
tracer-gas without receiving further instructions about the dosing task
from the system controller. When the time period specified by the dos-
ing time-out is exceeded, the 1303 stops delivering tracer-gas, and
sets the Dosing Nozzle Flag in the Warning Flags byte (
section 3.8.5 ).
The range of possible values is from 10s to 3600s. If you do not specify
a value for this parameter, the 1303 uses the default value of 60s.
The dosing time-out is changed as follows.
Examples:
DOSING_TIME_OUT 30<LF> Changes the dosing time-out to
30s.
The current dosing time-out value can be checked using the following
job:
DOSING_TIME_OUT?<LF> Outputs the current dosing time-out
value from the 1303.
3.3.2 The Characteristic Gas Constant Parameter
This value is the ratio, R /
M
, of the universal gas constant (R=8314 J
kmol -1 K -1 ) and the molecular weight (kg kmol -1 ) of the tracer-gas be-
ing used. This is used in the calculation of the calibration data for each
dosing nozzle, and must therefore be changed before calibrating the
1303 with a different tracer-gas from the one previously used.
Note: calibration of the doser system is not possible if no value is given
for this parameter.
The range of values is from 0 to 10 000. There is no default value.
Example:
SF
6
Tracer gas: SF6 molecular weight: M = 146,05 kg/kmol =
146,05 g/mol.
The Characteristic Gas Constant Parameter R /
M
= 8314/146,05 =
56,92
GAS_CONSTANT 56.92<LF> Sends the gas constant value 56.92
(for SF
6
) to the 1303.