Probes; M Series And Tf Series Moisture Probes - GE Moisture Image 1 Series Programming Manual

June 2003

Probes

M Series and TF Series
Moisture Probes
1-4
Probes are the part of the system that come into contact with the
process flow. The Series 1 uses various types of probes to fit the
needs of a wide range of applications.
The term "probe" includes devices such as moisture sensors, pressure
transducers, and oxygen cells. Although you can supply your own
probes for certain measurements, GE Panametrics provides the
following standard probes to make moisture, temperature, pressure
and oxygen measurements:
•
Moisture (M) Series - moisture and temperature (in gases and
liquids)
•
Three Function (TF) Series and Moisture Image Series Probes -
moisture, temperature, and pressure (in gases and liquids)
•
Delta-F Cells - oxygen measurement (in gases)
The most commonly used probes are discussed in more detail below.
The M Series and the TF Series probes are very similar. Both probes
use GE Panametrics aluminum oxide sensors to measure moisture,
and thermistor beads to measure temperature (the thermistor is
optional). The TF Series, however, also has an optional built-in
strain-gage-type pressure transducer. The sensor assemblies are
secured to a probe mount and are usually protected with a sintered
stainless-steel shield (TF-9 probes do not have a shield). Other types
of shields are available (refer to Figure 1-2 below and Figure 1-3 on
page 1-5).
When using an M Series probe, a separate pressure transmitter is
required if in-line pressure measurement is needed. The Series 1 can
use any pressure transmitter with a 0/4 to 20 mA or 0 to 2-V output.
Alternatively, the user can enter fixed values for temperature and
pressure into the Series 1 memory if the process conditions are
constant.
Figure 1-2: The M Series Probe
Features and Capabilities