Wide-range pressure sensors with built-in gain & temperature compensation

June 30, 2015 // By Graham Prophet
Panasonic Automotive & Industrial Systems has added high-precision, miniature semiconductor pressure sensors with built-in amplification and temperature compensation circuitry (PS-A units).

Precision sensors without amplifier and open Wheatstone measurement bridge are also available and in ultra-miniaturised sizes (PS). There are also versions with chamfered pins for improved ease of DIP pin insertion into PCBs.

The PS-A units come in three types. The standard type with a glass base can handle pressures from ±100 kPa to -1000 kPa with a total accuracy of ±1.25%. The economy type without a glass base is for 40 kPa pressures and ±4% accuracy and the low-pressure version is for 6 kPa and ±2.5% accuracy. Footprint is 7.0 x 7.2 mm (10.4 x 10.4mm for the low-pressure type).

“The PS-A units can be used in pressure switches and pneumatic devices in industrial applications,” said Alexander Hoch, Team Leader Product Marketing Department at Panasonic: “They also have medical uses in blood-pressure monitors, compressed air pressure measurement and air beds as well as in other pneumatically operated pressure devices. And the low-pressure types can be used for water level detection in household washing machines and dishwashers, air pressure control in clean rooms and medical respiratory pressure measuring instruments.”

The PS and PF sensors come in two versions. The standard type with a glass base is for pressures from 4.9 to 980.7 kPa and the economy type without a glass base for 40 kPa. The PS models have a footprint of 7.2 x 7.2 mm.

“In the PS version, a high degree of precision and linear detector response has been achieved by applying the semiconductor strain gauge system,” said Alexander Hoch. “This makes them highly reproducible based on repeated pressure.”

Taking their place alongside the standard 5 kΩ bridge resistance models are PS units with a 3.3 kΩ resistance, which is suited to 5V drive circuits. Applications for the PS units include industrial pressure switches and pneumatic devices and medical blood pressure measurement.

Panasonic Automotive & Industrial Systems Europe; : http://eu.industrial.panasonic.com/