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©Copyright 2012 LDetek inc. • 271, Saint-Alphonse Sud, Thetford Mines (Quebec) Canada G6G 3V7
RESPONSE TIME
NOISE
The LD8000 has a fast response time to ensure a good
purity control in the different applications of such analysis.
However, such good result is always dependant of the
installation along with the instrument. The stream selector
system is critical to be able to achieve such good response
time. We strongly suggest to use the LDGSS from LDetek
which has been designed specifically for such application.
The electronic for the acquisition of the detector has been
designed to avoid any noise that could influence the reading
of the analyzer. But more importantly, the design of the
detector itself is very important to minimize the noise as much
as possible. The position of the optical filter along with the
photo-diode is critical to get the specification of the LD8000.
Bad response of those components means electrical gain
increase to achieve the measurement desired and at the
same time the noise level will be amplified. When mounting
the detector, special care is done by LDetek specialist.
The amplifier board used to manage the signal from the
photo-diode was also particularly well designed. This board
takes very low voltage to amplify it on a scale up to 0-10 volts.
Analyzer Performance
The design of the LD8000 brings outstanding performances for the market demand. Even if this analyzer is used for ppm
measurement, we get stability, accuracy and noise level for ppb analysis. With the design described above, some tests have been
done to show the performances in different situations. Those performances have been tested with argon sample, since it is the most
popular application on the market.
Figure 10
:
*LD8000 Reponse time
Figure 11
:
*Noise level acquired on the analog output
with a sample gas of about 0.104 ppm
Note:
This result has been obtained in LDetek facilities with the LDGSS stream selector device with a well purged system according to LDetek standard methods.
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