Design and Analysis of Hall Effect Probe-Based Pressure Transmitter Using Bellows as Sensor

Abstract

Bellows is an elastic-type pressure sensor used as a local indicator in industry. Transmission of bellows reading to a remote location in control room is very important in pressure measurement and control system in industry. In this paper, the design of a noncontact pressure transducer along with a transmitting unit using bellows as the primary sensing element and a Hall sensor as secondary sensing element has been described. The theoretical equations describing the operation of the proposed transducer and transmitter have been derived. The function of the transducer and transmitter has been experimentally tested and the experimental results are reported in the paper. Both transducer and transmitter characteristics have been found to be linear with good repeatability. The graphical abstract is shown in Fig. 1.Index Terms-Bellows, Hall sensor, noncontact technique, pressure transducer, pressure transmitter.

Design and development of a capacitance‐based wireless pressure transmitter

“…Rajita et al [12] 0-40 psig 0.26 mV/psig (1) Hall probe-based pressure transmitter (2) use wired mode of transmission (3) Non-contact type 5.…”

“…where V T is the thermal voltage and I s is the saturation current. When the output of log amplifier is passed through a differential amplifier then the output voltage signal is given by (12) where R D1 and R D2 are resistances across differential amplifier. Now, the output of differential amplifier is passed through an exponential amplifier, then its output is given by…”

“…So this electrical output is converted into an optical signal using Mach-Zehnder interferometer (MZI). Rajita et al [12] have designed and analysed a pressure transmitter using bellows and hall probe sensor. Hall probe sensor is used for converting the linear displacement of bellows into electrical output in the form of hall voltage.…”

Fabrication and testing of a Hall effect based pressure sensor

“…A very few designs of pressure sensors based on the Hall effect has been proposed in the literature. In Rajita et al (2015), the Hall sensor is used as a second sensing element after measuring displacement from the bellows, the primary sensing element. Similarly, a temperature compensated pressure sensor is fabricated and tested using Bourdon tube as primary sensor and Hall sensor as a secondary sensor (Sirshendu et al, 2019).…”