LumaSense Technologies INNOVA 1303 - Manual (Page 34)

Chapter 3
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BE1085-14
1303 Multipoint Sampler and Doser LumaSense Technologies A/S
Page 34 of 60
3.5 Using the Sampler System
Using the 1303’s sampler system (see Fig. 1.1 ), to deliver a sample to
the Gas Monitor is a 3-stage process:
1. The required sample valve is opened; all other sample valves are
closed automatically. The sampling pump starts.
2. The sample valve is connected to the sampling pump via the
1303’s internal 3-way valve, allowing the waste air to be ex-
hausted from the sample channel (via the Waste Air Outlet,
section 2.3.5 ) and drawing the new sample.
3. When the new sample has been drawn to the 1303, the internal
3-way valve is set to direct the sample to the Gas Monitor. The
sampling pump stops, and the Gas Monitor’s pump draws the
sample for analysis.
While the Gas Monitor is analyzing this sample, the next sample can
then be drawn ready for the next analysis.
Three interface jobs control the sampling process.
Examples:
OPEN_SAMP_VALVE 1<LF
>
CONNECT_SAMP_VALVE
TO_SAMPLING_PUMP<LF>
CONNECT_SAMP_VALVE
TO_MONITOR<LF>
Opens sample valve 1, closes all
other sample valves and starts
the sampling pump. If no sam-
ple valve is specified, all sample
valves are closed.
Connects the sample valve to
the sampling pump, and ex-
hausts the waste air from the
sample channel.
Stops the 1303’s sampling
pump, and directs the new sam-
ple to the Gas Monitor for analy-
sis.
The time taken to draw a sample depends upon the length of the sam-
pling tube. The gas-transport speed in a tube of internal diameter 3mm
is 2m s -1 , assuming that the sampling pump is working within its design