Macro sensors aid gas-turbine maintenance
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Macro Sensors product story
Edited by the Engineeringtalk editorial team
Sep 22, 2009
Macro Sensors' HLR 750 Series 0.75in LVDT Position Sensors aid predictive maintenance of gas turbines as part of process-control systems used to monitor shell expansion and bearing vibration.
Installed on turbine shells, the hermetically sealed AC-LVDTs measure shell expansion, providing linear output that operators can use to determine correct thermal growth of a turbine shell during startup, operation and shutdown.
The sensors are also used to monitor bearing vibration to detect bearing clearance limits that are indicative of bearing wear.
They offer reliable, contactless position measurement and temperature ranges of -65F (-55C) up to 300F (150C).
Available in full-scale measurement ranges from +/-1 to +/-10in, the stainless-steel position sensors feature high resolution, repeatability typically better than 0.01 per cent of full scale and non-linearity of less than 0.25 per cent of full-range output.
Other features include: a UL/ULC rating for continuous operation in Class I, Division I, Groups A, B, C and D and Class I, Zone 2, Group IIC hazardous locations (NEC 500 and 505); a through-bore design that makes the sensor's core accessible from both ends for better mechanical support and core guidance, as well as facilitating bore cleaning; and lead wires exit through a radially mounted 1/2in NPT male rigid conduit fitting for easy attachment to an explosion-proof junction box.
Macro Sensors supplies support electronics for the HLR 750 series, which work with conventional differential input LVDT signal conditioners or ratiometric signal-conditioning circuits.
For added protection against environmental elements, electronics can be installed in explosion-proof enclosures and connected to LVDTs using a suitable conduit.
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