Sample System Guidelines; Moisture Sample Systems - GE moisture.iq User Manual

Chapter 1. Installation

1.6 Sample System Guidelines

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.
BHGE applications engineers will make recommendations based on the following general guidelines.

1.6.1 Moisture Sample Systems

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 below
shows an example of a basic sample system consisting of an explosion-proof housing with a sample cell, a
filter, a flow meter, a vent valve, an inlet shut-off valve and an outlet shut-off valve.
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 construction for all wetted parts. Contact BHGE for further instructions.
Sam ple
Cell
Sam ple
Sam ple
Outlet
Inlet
Vent
Figure 1: A Typical Moisture Sample System
Note: The actual sample system design is dependent on the application requirements.
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