by Mat Dirjish
Designer of high-performance, low-cost sensor and sensing components Posifa Technologies introduces the latest member of its PVC4000 vacuum transducer series, the PVC4001-C MEMS Pirani vacuum transducer. Addressing cost-effective OEM integration issues, the component integrates a MEMS thermal conduction sensor, measurement electronics, a microprocessor, and a barometric pressure sensor in a compact PCB assembly with a connector-terminated wire harness.
Based on the company’s second-gen MEMS thermal conduction chip, the PVC4001-C operates on the principle that the thermal conductivity of gases is proportional to vacuum pressure. The integral electronics and microprocessor amplify and digitize the sensor signal and provide output via an I²C interface. Users can enter up to 10 pairs of calibration points for applications requiring calibrated output.
Other PVC4001-C features include a piecewise linearization algorithm, temperature sensor that supports a temperature compensation algorithm to offset changes in thermal conductivity, and a pulsed-excitation scheme to minimize drift due to self-heating. Specs include a measurement range from 0.001 Torr to 900 Torr (1.3*10-4 kPa to 120 kPa), response time of less than 200 ms, a barometric pressure sensor that supports measurement from 10 Torr to 760 Torr with 5% accuracy across that range, and an operating temperature range from -25°C to +85°C.
Samples and production quantities of the PVC4001-C are available now. For deeper details, procure and peruse the PVC4001-C datasheet.
Mat Dirjish Online 