Chapter 9. Features and Specifications
Model PM880 Portable Hygrometer User’s Manual 165
9.2.1 M Series and TF Series Moisture Probes
The M Series and the TF Series probes are very similar. Both probes use the
GE aluminum oxide sensors to measure moisture, and a thermistor bead
(optional) to measure temperature. The TF Series 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. See Figure 76.
If the optional temperature thermistor or pressure transducer is not used, the
user can enter fixed values for temperature and pressure into the PM880
memory.
Figure 76: M & TF Series Probe (ref dwgs 750-042 & 901-152)
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