Axetris AG
LGD F200P2 Operating Instructions - Rev D
19.09.2018
20/60
Purge gas must be filtered with a 1 μm in-line filter (e.g. syringe filter PTFE) and must be
oil-free. Otherwise contamination of internal optical components might occur leading to
sensor malfunctioning.
Purge gas flow is recommended to be 1-2 l/min
There might be a significant difference between the in-flow of the purge and the flow
measured at the outlet, particularly for the heated LGD version. The insulation, various
feed-through, and the fact that the housing is not designed to be gas-tight lead to
this difference.
Purging needs to be considered in case:
1. The target gas for measurement is present in the ambient air in significant concentrations.
2. Corrosive gases are present in the environment.
3. Condensation due to humidity and temperature changes can occur inside.
4. The gas matrix contains potentially dangerous mixtures. Purging can add additional safety in
case of cell leakage.
5. If the housing has been “contaminated” with the target gas and desorption takes place, the
sensor might not be able to reach a reading of 0 ppm anymore. To purge the system, flow N
2
or
air through the “Housing purge” until normal behaviour of the sensor is reached (0-reading).
This device is not certified for
the
use
with
potentially
explosive gas mixtures.
Use an in-line filter to remove
dust in the purge gas
Figure 14
Housing purge
outlet, closed with a screw
(standard)
Figure 15
Housing purge
connector installed
2.10 Gas supply
The piping system surrounding the sensor is important. Leaks in the piping system can falsify the results.
It is therefore recommended to carefully check the system for leaks. The use of correct fittings and sealing
helps to avoid leaks. Use standard pressure reduction equipment on gas bottles. Maximum standard flow
is 5 l/min. The minimum should be 1 l/min in most applications.
When measuring potentially dangerous concentrations of toxic gases (NH
3,
HCl, HF, etc.),
properly vent the exhaust of the sensor to a safe area. Improper venting of the exhaust may
cause serious personal injury
2.11 Measurement range and precision
Detailed specifications of each device are customer-, application- and gas-specific. Please refer to the
respective LGD F200P2 data sheets.
Содержание LGD F200P2
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