HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
7-24
Absolute housing expansion
PROCESSING MODES AND APPLICATIONS
7.10Absolute housing expansion
(1) Description
All thermal machines are subject to absolute expansion due to variations in their temperature.
The measurement of this parameter is performed on the machine at one or two critical points
on the housing using an absolute expansion probe, such as the AE119 (measuring range up
to 50 or 100 mm) from the Meggitt vibro-meter
®
product line. The body of this probe is
attached to a fixed reference and its measuring element makes physical contact with the
machine housing.
In Figure 7-19 below, two probes are used to measure two different (independent) machine
bodies, for example, the HP and LP turbine housings. The MPC4 is set up for single channel
processing. One MPC4 channel is required for each probe.
Figure 7-20 shows the processing performed for a single AE119 housing expansion probe.
Figure 7-19: Measuring the absolute housing expansion on two different bodies
To monitoring electronics
(Channel 1)
HP turbine
housing
LP turbine
housing
AE119
housing expansion probe
To monitoring electronics
(Channel 2)
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