Characteristics of the twin-wire resistance-probe water manometer

Abstract

This paper investigates the practicality of using depth probes in the two arms of a water manometer for measuring pressure differences. The main feature of the design is the capability to measure low-pressure differences, accurately, at low cost. From the extensive performance tests conducted, it is found that the output voltage from the resistance-probe manometer is linearly proportional to the difference in pressure. A sensitivity and accuracy of measurement of 50 m V/mm and 0.5 Pa (about 0.05 mm of water), respectively, have been achieved. Good linearity and low drift have also been observed.