4 calibrating the doser system – LumaSense Technologies INNOVA 1303 User Manual
Page 32
Chapter 3
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BE1085-14
1303 Multipoint Sampler and Doser
LumaSense Technologies A/S
Page 32 of 60
Example:
CALIB_DATA 1,1.25
Sets the calibration data of number
1 dosing nozzle to 1.25.
To avoid having to calibrate each dosing nozzle after each time the
1303 has been switched off, it is recommended that the calibration data
for each nozzle is read-out and noted for future reference. The calibra-
tion data for a specific nozzle can be checked using the following job.
CALIBRATION_DATA? 1
ing nozzle number 1.
3.4 Calibrating the Doser System
Each of the nozzles in the 1303’s doser system must be calibrated so
that the amount of tracer-gas delivered during a given dosing proce-
dure can be accurately determined. The 1303’s doser system must be
calibrated before performing any dosing tasks, and also every time you
use a different tracer-gas from the one used previously.
A volume of tracer-gas is enclosed between the main valve and the
dosing valves; this volume is then released through the nozzle to be
calibrated. As the internal volume of the airways are known, the effec-
tive outflow area for each nozzle is calculated from the rate of pres-
sure-decrease measured in the dosing airway. The amount of tracer-
gas delivered can then be calculated from the effective outflow area,
the tracer-gas supply pressure and temperature, and the dosing time-
period.
Once started, using the appropriate interface job, the 1303’s calibration
procedure is fully automated.
Note: ensure that a tracer-gas supply is connected to the 1303 as de-
scribed in
section 2.3.3
before starting calibration, otherwise calibration
cannot be performed.
If you do not want the tracer-gas used for calibration to mix with the
air in the room in which you are performing the calibration, attach tub-
ing to the dosing nozzle (
section 2.3.1
) to direct the tracer-gas out of
the room.
Important! To ensure accurate calibration of the 1303, observe the
following points before performing the calibration procedure.
1. The 1303 must be placed in the area in which it will be used, with
power on, at least 10 minutes before calibrating. This allows the