Easidew PRO XP User’s Manual
Kahn Instruments
15
OPERATION
3.2
Sampling Hints
Operation is very simple, assuming the following installation techniques are adhered
to:
Be Sure the Sample is Representative of the Gas Under Test:
The sample point should be as close to the critical measurement point as possible.
Also, never sample from the bottom of a pipe as entrained liquids may be drawn into
the sensing element.
Minimize Dead Space in Sample Lines:
Dead space causes moisture entrapment points, increased system response times
and measurement errors, as a result of the trapped moisture being released into the
passing sample gas and causing an increase in partial vapor pressure.
Deadspace
Figure 18
Indication of Dead Space
Remove Any Particulate Matter or Oil from the Gas Sample:
Particulate matter at high velocity can damage the sensing element and similarly, at
low velocity, they may ‘blind’ the sensing element and reduce its response speed. If
particulate, such as degraded desiccant, pipe scale or rust is present in the sample gas,
use an in-line filter, as a minimum level of protection. For more demanding applications
Kahn Instruments offers a range of sampling systems (for more information contact
www.kahn.com).
Use High Quality Sample Tube and Fittings:
Kahn Instruments recommends that, wherever possible, stainless steel tubing and
fittings should be used. This is particularly important at low dew points since other
materials have hygroscopic characteristics and adsorb moisture on the tubing or pipe
walls, slowing down response and, in extreme circumstances, giving false readings.
For temporary applications, or where stainless steel tubing is not practical, use high
quality thick walled PTFE tubing and work within the maximum pressure rating of this
tubing.
Position Transmitter away from Heat Source:
It is recommended, as good instrumentation practice, that the transmitter is placed
away from any heat source to avoid adsorption/desorption (particularly solar radiation
during daylight hours).
Summary of Contents for Easidew PRO XP
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