Pressure transducers handle cryogenic operation
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Kulite Sensors product story
Edited by the Engineeringtalk editorial team
Jul 11, 2005
A new range of miniature ruggedised pressure transducers offers high performance and low-temperature stability.
Available from Kulite is a range of miniature ruggedised pressure transducers, offering high performance and low-temperature stability.
Kulite's IS pressure transducers are intended for cryogenic operation, for use over the temperature range -195.5 to +120C.
A number of ranges are available, to suit applications with different requirements in terms of size, ruggedness or high frequency response, for example.
The CT-375 and CT-190 series devices are ruggedised IS pressure transducers with a threaded interface being ideal for use in cryogenic wind tunnels.
Both sensor ranges offer extremely good low temperature stability and repeatability while also providing a high frequency response.
The CCQ-093 and CCQ-062 series are suitable for incorporation in user-designed probes.
The cylindrical sensor is 9.5mm in length, with a diameter of 2.4 or 1.7mm, for the CCQ-093 or CCQ-062 ranges, respectively.
Suitable for pressure measurements in all nonconductive, noncorrosive liquids or gases, the devices can be used in a number of operational modes including: absolute, gauge, sealed gauge and differential.
Device specifications include an overpressure figure of 2x rated pressure, with no change in calibration, and a burst pressure figure of 3x rated pressure.
All these sensor ranges provide a full scale output (FSO) of 100mV (nominal) with a residual unbalance of +/-5mV.
The devices offer combined nonlinearity, hysteresis and repeatability figures of +/-0.1% FSO BFSL (typical) and +/-0.5% FSO (maximum).
The sensors provide resolution accurate to an infinitesimal level.
The superb performance of Kulite's IS pressure transducers stems from the use of proprietary monolithic sensor technology.
These dielectrically isolated, silicon-on-silicon sensors comprise three layers of silicon, which are bonded together atomically.
A layer of monocrystalline, N-type silicon is micromachined to create a force-summing diaphragm.
Another layer, made of P-type silicon, contains four strain gauges, connected together in a Wheatstone bridge circuit - these two layers being separated by a dielectric layer of silicon dioxide.
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