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Chapter 1. Installation and Wiring
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. GE 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 flowmeter, 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 GE 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.
moisture.IQ User's Guide
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