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Transducer for Highly Critical Air Pressure Measurement

Transducer for Highly Critical Air Pressure Measurement Transducer for Highly Critical Air Pressure Measurement vibrate at its natural resonant WITH even the most advanced technology there is usually room for frequency by means of an some further improvement. electromagnetic drive. Solartron Transducers' Series 3087 Any change in air pressure alters absolute air pressure transducer has, the stress induced in the thin cylinder wall by the pressure it is stated, been thoroughly flight proven in numerous avionics differential applied across it, and the applications, for both military and natural frequency varies precisely at all significant when rapid air civil aircraft, and is said to be with this stress. A pick-up coil senses temperature changes occur and generally accepted as offering a high the frequency change and its signal is compensation for the density effect amplified and fed back to the drive accuracy and longterm stability. The is not being effectively achieved. minor influence of air density on the coil to maintain the now modified sensitivity of the 3087 vibrating natural resonance. This amplified Other advantages cylinder sensor is claimed to be signal also provides for the pressure In addition to ensuring continuing readily acceptable for most aviation measurement. high accuracy in these exceptional purposes , and this model will circumstances, external mounting of By making a design change to the continue to be the standard for the the electromagnetic coils has other drive and pick-up coil assembly on foreseeable future. For engine advantages. Ageing of a central the Series 3088 transducer, the control applications, however, spool body, a gradual change in its already minor density effect has where density effect is marginally characteristics, and its positional been halved. In reducing the density more significant, Solartron has now change relative to the vibrating effect, the temperature introduced the complementary cylinder over several years are all characteristics of the transducer Series 3088 transducer. factors influencing longterm have also been significantly stability of the transducer, which is The Series 3088 transducer is improved. These improvements are thus further improved by spool available in six models offering especially helpful in some avionics removal. The measurement signal is applications where air temperature different pressures ranges: 0-20, 0- also significantly improved. Thirdly, can change rapidly, so that the 38, 0-50 and 0-500 lb/in2 absolute, with the coils mounted externally it sensing diode has difficulty in all as provided by the Series 3087, is easier to replace one should it fail plus two intermediate models responding quickly enough. An during factory testing, rather than covering 0-70 and 0-150 lb/in2 exmple might be aircraft engine having to scrap an entire central controls in say Alaska, when on start absolute to satisfy a wider range of spool assembly. up the temperature can rise from applications. Achievable accuracy is -55°C to +125°C in a matter of As well as digital engine controls, 0.10% of reading. Stability is typically 0.005% (full scale) minutes. Solartron air pressure transducers maximum drift over a 12 months are widely used in air data The design change involved computers, altitude and air speed period. remounting the coils on the outside indicators, and for ground testing of the transducer casing, so that the Like the Series 3087, the new installations for these instruments. electromagnetic forces are applied transducer utilises vibrating cylinder They are also used in digital pressure through the reference vacuum. This sensing technology, which has been indicators and as transfer standards continuously developed by enabled removal of the spool from for other pressure transducers. Solartron over the past 25 years. In the pressurised air space. It was found that this spool has a slight these transducers, a reference Solartron Transducers - Aerospace reflective effect on the air displaced vacuum is maintained around the Victoria Road by the vibrating cylinder, and this outside of the cylinder and the Farnborough pressure for measurement is applied tends to dampen the resonance. This Hampshire GU14 7PW to the inside. The cylinder is made to dampening influence only becomes AIRCRAFT ENGINEERING - August 1985 11 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Transducer for Highly Critical Air Pressure Measurement

Aircraft Engineering and Aerospace Technology , Volume 57 (8): 1 – Aug 1, 1985

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb036143
Publisher site
See Article on Publisher Site

Abstract

Transducer for Highly Critical Air Pressure Measurement vibrate at its natural resonant WITH even the most advanced technology there is usually room for frequency by means of an some further improvement. electromagnetic drive. Solartron Transducers' Series 3087 Any change in air pressure alters absolute air pressure transducer has, the stress induced in the thin cylinder wall by the pressure it is stated, been thoroughly flight proven in numerous avionics differential applied across it, and the applications, for both military and natural frequency varies precisely at all significant when rapid air civil aircraft, and is said to be with this stress. A pick-up coil senses temperature changes occur and generally accepted as offering a high the frequency change and its signal is compensation for the density effect amplified and fed back to the drive accuracy and longterm stability. The is not being effectively achieved. minor influence of air density on the coil to maintain the now modified sensitivity of the 3087 vibrating natural resonance. This amplified Other advantages cylinder sensor is claimed to be signal also provides for the pressure In addition to ensuring continuing readily acceptable for most aviation measurement. high accuracy in these exceptional purposes , and this model will circumstances, external mounting of By making a design change to the continue to be the standard for the the electromagnetic coils has other drive and pick-up coil assembly on foreseeable future. For engine advantages. Ageing of a central the Series 3088 transducer, the control applications, however, spool body, a gradual change in its already minor density effect has where density effect is marginally characteristics, and its positional been halved. In reducing the density more significant, Solartron has now change relative to the vibrating effect, the temperature introduced the complementary cylinder over several years are all characteristics of the transducer Series 3088 transducer. factors influencing longterm have also been significantly stability of the transducer, which is The Series 3088 transducer is improved. These improvements are thus further improved by spool available in six models offering especially helpful in some avionics removal. The measurement signal is applications where air temperature different pressures ranges: 0-20, 0- also significantly improved. Thirdly, can change rapidly, so that the 38, 0-50 and 0-500 lb/in2 absolute, with the coils mounted externally it sensing diode has difficulty in all as provided by the Series 3087, is easier to replace one should it fail plus two intermediate models responding quickly enough. An during factory testing, rather than covering 0-70 and 0-150 lb/in2 exmple might be aircraft engine having to scrap an entire central controls in say Alaska, when on start absolute to satisfy a wider range of spool assembly. up the temperature can rise from applications. Achievable accuracy is -55°C to +125°C in a matter of As well as digital engine controls, 0.10% of reading. Stability is typically 0.005% (full scale) minutes. Solartron air pressure transducers maximum drift over a 12 months are widely used in air data The design change involved computers, altitude and air speed period. remounting the coils on the outside indicators, and for ground testing of the transducer casing, so that the Like the Series 3087, the new installations for these instruments. electromagnetic forces are applied transducer utilises vibrating cylinder They are also used in digital pressure through the reference vacuum. This sensing technology, which has been indicators and as transfer standards continuously developed by enabled removal of the spool from for other pressure transducers. Solartron over the past 25 years. In the pressurised air space. It was found that this spool has a slight these transducers, a reference Solartron Transducers - Aerospace reflective effect on the air displaced vacuum is maintained around the Victoria Road by the vibrating cylinder, and this outside of the cylinder and the Farnborough pressure for measurement is applied tends to dampen the resonance. This Hampshire GU14 7PW to the inside. The cylinder is made to dampening influence only becomes AIRCRAFT ENGINEERING - August 1985 11

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: Aug 1, 1985

There are no references for this article.