LumaSense Technologies INNOVA 1412i - Manual (Page 33)

Chapter 4
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 33 of 202
Table 4.1 gives some indication to the measurement times depending
on the number of gases measured and the measurement times
selected. However, these times may vary from one measurement
cycle to another due to the cleanliness of the filters and the degree
of fluctuation in the concentration of the various gases.
Table 4.1 Approximate measurement times
Monitor Setup Volume of Air Response Times
S.I.T.: “Normal” (5s)
SIT : “Low Noise”
(20s)
Flushing:
Auto, (tube 1m)
140 cm 3 /sample
One gas: ~27s
5 gases + water:
~60 s
5 gases + water:
~150 s
S.I.T.: “Fast” (1s)
Flushing:
Chamber 4s, Tube
“OFF”
20cm 3 /sample
One gas: ~13s
5 gases + water:
~26s
4.1.2 Monitoring Task
A monitoring task consists of a series of similar measurement cycles.
These cycles can either be repeated at regular intervals or be
continuous:
4.1.3 Sampling Interval
The sampling interval is a measure of the time between the start of
one measurement cycle and the start of the following measurement
cycle.
When the Monitor is not sampling continuously the sampling interval
has to be defined by the user and is a fixed period of time (see
Fig.4.1).