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1.8 Installing the Probes
After you mount the sample system, you must insert the moisture probes into the sample cells. In addition, you must
check, prepare, and connect any installed oxygen cells to the gas line.
1.8.1 Moisture Probes
GE Moisture Image Series (MIS) and M-Series moisture probes have 3/4 inch-16 straight threads, with an O-ring seal,
to the secure probes into the sample system or directly into the process line. Other fittings are available for special
applications.
CAUTION! If mounting the moisture probes directly into the process line, you must consult GE for
proper installation instructions and precautions.
Moisture probes are usually installed into a sample system. The sample system protects the probes from coming into
contact with damaging elements in the process. Moisture probes are installed into a cylindrical shaped container, called
the sample cell, which is included as part of your sample system. The sample cell is identified by a label on the sample
system plate.
To install a moisture probe that has a 3/4 inch-16 straight thread, insert it into the sample cell so it is perpendicular to
the sample inlet. Screw the probe into cell, making sure not to cross thread it, and tighten it securely. Figure 4 below
shows a typical moisture probe installation, with the probe mounted in a GE sample cell. Install any moisture probes
with different fittings in the appropriate manner.
Note: Standard moisture probes have a sintered stainless steel shield that protects the aluminum oxide sensor. Be sure
to leave the shield in place for maximum protection.
It is important to eliminate all gas or liquid leaks for safety reasons and to ensure that measurements are not affected by
ambient contamination. For gas applications, you should check for leaks using a soap bubble solution.
IMPORTANT:
Refer to the Calibration Data Sheets to connect the probes to their corresponding channels. If a probe is
connected to the wrong channel, the meter will display incorrect data.
moisture.IQ User's Guide
Inlet
Outlet
Figure 4: Typical Moisture Probe in Sample Cell
Chapter 1. Installation and Wiring
Probe
Sample Cell
9
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