Pressure gauge

Details Pressure gauge Pressure gauge

1991-04-18

1993-01-19

Woodiel, Donald O.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

731468, 73725, 338 42, G01L 902, G01L 2700

Patent

active

051798565

ABSTRACT:
Disclosed is a pressure gauge which is mainly composed of two parts, a pressure sensing element and an electronic processing and displaying unit. The pressure sensing element includes an elastic member and a variable resistor whose resistance value can be varied by the force of the pressure. An output electrical signal is occasioned by the electronic circuit, which is in proportions corresponding to the resistance value of the variable resistor. The electronic processing and displaying unit will further process the output electrical signal and display the value of the pressure in an indicator, preferably a liquid crystal display (LCD). The pressure goes through a calibration process every time when the power is just turned on to calibrate an initial output electrical signal occasioned by the variable resistor. The electronic processing and displaying unit also includes switches which are selected during the manufacturing process in accordance with the manufacturing error of the elastic constant of the elastic member incorporated in the pressure gauge. The pressure gauge further includes means for displaying the pressure in different unit.

REFERENCES:
patent: 4718278 (1988-01-01), Bergsma
patent: 4967047 (1990-10-01), Betterton et al.

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