LumaSense Technologies INNOVA 1303 - Manual (Page 16)

Chapter 2
________________________________________________________________________
_______________________________________________________________________
BE1085-14
1303 Multipoint Sampler and Doser LumaSense Technologies A/S
Page 16 of 60
takes the next sample for analysis from the room. As the amount of
tracer-gas delivered to the room is known, and the remaining concen-
tration of tracer-gas in the samples is determined by the Gas Monitor,
the ventilation-system performance can be calculated.
Fig.2.3. A typical air-change analysis system, shown with an applica-
tion example. In this case, the aim of the analysis is to deter-
mine the size of the air-change in the mechanically ventilated
room. The diagram shows only one dosing and sampling point,
for clarity. Up to 6 similar analyses can be performed simulta-
neously using one 1303. 7620 Application Software gives con-
trol of all the functions of the system.
2.2.1 Connecting the 1303 to the System Controller
The 1303 is connected to the computer by the IEEE interface bus, over
which the 1303 receives the commands and data which control it. Fur-
ther information about the cables available from LumaSense to connect
the 1303 onto the IEEE interface bus, and about the IEEE interface of
the 1303, are given in section 4.1 .
2.2.2 Setting the Interface Address of the 1303
The 1303 uses a single interface address. The address is set using the
bank of eight switches on the rear panel of the 1303. The last five
switches on the bank decide the interface address. These switches are
marked A1 (the least significant bit) to A5 (the most significant bit).
The switches represent binary values, as follows:
If the switch is down, it represents a binary “0”. See Fig. 2.4 .