Fluid pressure measuring device and liquid level measuring instrument

Abstract

The invention discloses a fluid pressure measuring device and a liquid level measuring instrument, which belongs to the technical field of pressure and liquid level measurement. The fluid pressure measuring device comprises a shell, a first connector assembly, a second connector assembly and a pressure sensor, and a containing cavity used for containing gas is formed in the shell; one end of the first connector assembly communicates with the containing cavity, and the other end of the first connector assembly communicates with an external air source; the containing cavity can be filled with compressed air; one end of the second connector assembly is communicated with the containing cavity, and the other end is communicated with to-be-measured fluid; the pressure sensor is arranged in the containing cavity in a sealed mode and used for measuring the pressure intensity of compressed air in the containing cavity. The liquid level measuring instrument comprises the fluid pressure measuringdevice. The fluid pressure measuring device and the liquid level measuring instrument are high in integration level, convenient to assemble, high in reliability and wide in application range.

Description

technical field [0001] The invention relates to the technical field of pressure and liquid level measurement, in particular to a fluid pressure measuring device and a liquid level measuring instrument. Background technique [0002] Fluid pressure signal measurement is a very common measurement technique. Traditional pressure measurement devices mainly include absolute pressure and differential pressure. The absolute pressure obtained by the absolute pressure measurement method is the sum of the pressure of the fluid to be measured and the atmospheric pressure of the surrounding environment, but the atmospheric pressure is not a constant value, and is easily affected by various factors such as air pressure in different regions and different periods, and the measurement accuracy is low. [0003] The existing differential pressure measurement method needs to put the measurement device into the fluid to be tested, and the test device has high requirements on the environment. Fo...

AI Technical Summary

Problems solved by technology

For example, the gas in the gas environment to be tested is corrosive, and the test device is easily corroded, which affects the test accuracy; or there are many suspended solids in the liquid in the liquid environment to be tested, and the suspended solids and microorganisms will adhere to the surface of the test device, causing If the test device is clogged, the measurement accuracy and sensitivity will be greatly reduced, which will affect the use of the test device

[0004] Existing non-contact measuring devices, such as bubble-type water level measuring instruments, directly install a gas pipe on the pressure sensor, and put the gas pipe into the water to be tested for pressure detection. Since water vapor will contact the pressure sensor through the gas pipe, the water resistance is poor and affects the pressure. The service life of the sensor; generally, the pressure sensor is glued with a stainless steel air guide tube or a plastic air guide tube interface. The airway interface falls off, which is inconvenient to assemble

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