Manual

Chapter 1
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BE1085-14
1303 Multipoint Sampler and Doser LumaSense Technologies A/S
Page 10 of 60
The carrier-air inlet pumps extra air to the dosing outlets to speed de-
livery of the tracer-gas to the dosing point. This inlet has a coarse air-
filter, a pump, and a pressure transducer for checking the efficiency of
the pump. Delivering a dose of tracer-gas to a dosing point 50m distant
takes 1 minute.
The dosing system can deliver a continuous dose, that is, an uninter-
rupted flow of tracer-gas over a period of time; or a discontinuous
dose, in which the amount of tracer-gas delivered is reduced by inter-
rupting the flow at regular intervals during the dosing period.
The doser system is set up for use by specifying a dosing time-out such
that the 1303 will stop any current dosing procedure after a given time
has elapsed without instruction from the controlling computer. This val-
ue is specified form the controlling computer.
1.1.3 Front Panel
Fig.1.2 The front panel of the 1303
Doser: 6 mounting stubs for connection of tubing (AF0005, red)
to dosing points. Each stub is numbered, and has a cor-
respondingly-numbered lamp. When the lamp is lit, it
indicates that the corresponding dosing valve is open,
see section 3.6.3. When the Main Valve Open lamp is
lit, it indicates that the main dosing valve is open, see
section 3.6.2.
Sampler: 6 mounting stubs for connection of tubing (AF0006,
green) to sampling points. Each stub is numbered, and
has a correspondingly-numbered lamp. When the lamp