Sample System Guidelines; Moisture Sample Systems - GE Moisture Image Series 1 Startup Manual

April 2004
Sample System
Guidelines
Moisture Sample
Systems
1-8
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A sample system is required for oxygen measurement and, although
not mandatory, is highly recommended for moisture measurement.
The purpose of a sample system is to condition or control a sample
stream to within the specifications of a probe. The application
requirements determine the design of the sample system. GE
Panametrics applications engineers will make recommendations
based on the following general guidelines.
Typically, sample systems should be kept very simple. They should
contain as few components as possible and all or most of those
components should be located downstream of the measurement
probe. Figure 1-3 on page 1-9 shows an example of a basic sample
system consisting of an explosion-proof housing with a sample cell, a
filter, a flowmeter, a vent valve and two-shut off valves, one at the
inlet and one at the outlet.
The sample system components should not be made of any material
that will affect measurements. A sample system may include a filter
to remove particulates from the sample stream or a pressure regulator
to reduce or control the pressure of the stream. However, most
common filters and pressure regulators are not suitable for sample
systems because they have wetted parts that may absorb or release
components (such as moisture) into the sample stream. They may also
allow ambient contamination to enter the sample stream. In general,
you should use stainless steel material for all wetted parts.
Contact GE Panametrics for further instructions.
Installation