Making High Temperature Rotation Measurements

Jeff Watson, a systems applications engineer in the High Temperature Strategic Marketing Group of Analog Devices, explains the high temperature measurements in ADI’s demo at Sensors Expo 2011 to Randy Frank.

With the 175°C rated ADXL206 accelerometer and the 210°C rated AD8229 instrumentation amplifier, rotation can be measured inside an oven.

For more information about Analog Devices ADXL206, dual-axis, high temperature accelerometer click here and for the AD8229 high temperature instrumentation amplifier, click here.

To watch the video, click here.

Accelerometer Designed for Continuous Operation to +482°C (+900°F)

At 482°C, Meggitt Sensing Systems Endevco model 6233C is rated considerably higher than the recently announced 6222S model that had a maximum 260°C operating environment. Available standard ranges of 10, 50 and 100 pC/g, the model 6233C offers a differential output with excellent performance stability over temperature and a wide operational bandwidth. The case isolated units have a standard three-point ARINC mounting and a rugged 2-pin 7/16-27 UNS 2A threaded receptacle. Target applications include high-precision vibration monitoring of high-temperature jet and turboprop engines, helicopter and rotorcraft HUMS, gas turbines and nuclear power plant machinery and equipment.

For more information about the Endevco model 6233C high temperature accelerometer, click here.

High Temperature Pressure Sensor Targets Gas Turbine Monitoring

Most pressure sensors are offered in plastic packages and operate in a maximum ambient temperature of 125°C or less. Monitoring the pressure of a gas turbine requires a totally different approach. IMI Sensors Series 176 pressure sensors use  a stainless steel housing and piezoelectric sensing technology to tolerate the extreme heat environment (+986°F, +530°C) generated by  gas turbines. As a result, the units can be mounted directly to the combustor. The sensors have sensitivities to 17 pC/psi (2.5 pC/kPa) and ranges from 20 psi (140 kPa) dynamic to 400 psi (2760 kPa) static.

For more information on the IMI Sensors Series 176 pressure sensor click here.

Accelerometer Operates in Continuous 260°C Environment

Designed for monitoring vibration in gas turbines, Meggitt Sensing Systems Endevco Model 6222S accelerometer is a piezoelectric design with sensitivities of either 20, 50 or 100 pC/g. The sensor’s piezoelectric technology does not require an external power supply. The unit’s balance differential output allows its use with any industry differential charge amplifier. The sensor’s packaging is a standard ARINC three-point mounting configuration using three mounting bolts. The unit has an integral two-pin 7/16-27 UNS-2A threaded receptacle as standard with an available three-pin option. 

In addition to gas turbine measurements the accelerometers are also well suited for high temperature and high reliability vibration monitoring in helicopter Health & Usage Monitoring Systems (HUMS) as well as ground and onboard aircraft engine monitoring.

For more information on Meggitt Sensing Systems Endevco Model 6222S – 100A Accelerometer, click here.

High Temperature LVDT Position Sensor for Military/Defense Applications

The usual 150C maximum operating temperature won’t cut it in many military and defense applications. For those who need to make position measurements in ranges of ±0.05″ to ±10″ [±1.25 mm to ±250 mm] at operating temperatures up to 400°F (200°C), Macro Sensors HSTAR 750 Series Hermetically Sealed Position Sensors could provide the solution.

 In addition to their maximum operating temperature of 200C, the 3/4 inch (19 mm) diameter AC-operated LVDTs are environmentally sealed to IEC IP-68, so they can handle rugged application requirements.

 The design targets the harsh environments found in military and defense applications such as fuel / oil level monitoring, load leveling of artillery platforms and controlling flight surfaces of airplanes and rudder positions of aircraft carriers, tankers, ships as well as submarines.

For more information about Macro Sensors HSTAR 750 Series Hermetically Sealed Position Sensors, click here.