20mA Thread Flange Liquid Level Transmitter High Precision

Good Stability And High Precision 20mA Liquid Level Transmitter

NH93420 series liquid level transmitter is an all stainless steel design, fully sealed submersible solid piezoresistive liquid level measuring instrument. This product uses high-stability and high-reliability piezoresistive pressure sensors from famous foreign brands, as well as high-precision intelligent transmitter processing circuits. It adopts precise digital temperature compensation technology and nonlinear correction technology to The bit signal is converted into a standard electrical signal output. The waterproof cable is sealed with the casing, and the ventilation tube is in the cable, which can be used in liquid for a long time. The integrated structure and standardized signal output provide convenience for on-site use and automatic control. The product works in a two-wire system, with small size, light weight, easy installation and convenient use. It is suitable for liquid level measurement and control in the fields of petroleum, chemical, power plants, urban water supply, and water temperature exploration.

Liquid Level Transmitter Working Principle

The level transmitter consists of a special gas-conducting cable with a built-in capillary hose, a pressure-resistant connector and a probe. The probe construction of the submersible level gauge is a stainless steel barrel with a diaphragm at the bottom and covered by a perforated plastic housing. The liquid level measurement is actually the difference between the static pressure of the liquid on the probe and the actual atmospheric pressure, and then the pressure difference is converted into a 4~20mA output signal by a ceramic sensor (attached to the stainless steel film) and electronic components.

When the static pressure liquid level transmitter is put into a certain depth in the liquid to be measured, the pressure formula on the liquid surface of the sensor is: PA=p*g h+Pa The liquid level formula is obtained: h=PA-Po/p *g

At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the air-conducting stainless steel, and then the atmospheric pressure on the liquid surface is connected to the negative pressure chamber of the sensor to offset the Po on the back of the sensor, so that the pressure measured by the sensor is: PA-Po =p*g-h

If the liquid density is uniform, the static pressure difference is proportional to the liquid level height.

Liquid Level Transmitter Technical Parameters

Liquid Level Transmitter Design Feature

1. Good stability and high precision.

2. The structure is exquisite, it can be directly put into the measured medium to measure the liquid level, and it is very convenient to install and use.

3. Solid structure, no moving parts, high reliability and long service life. High-precision measurement can be performed from water, oil to paste with high viscosity, and is not affected by the foaming, deposition and electrical characteristics of the measured medium.

4. Wide range of temperature compensation.

5. With power supply reverse polarity protection and overload current limiting protection, anti-lightning, anti-radio frequency interference.

Liquid Level Transmitter Application Field

Hydrostatic input level transmitter (input level meter) is suitable for level measurement of various media in systems and industries such as petrochemical, metallurgy, electric power, pharmaceutical, water supply and drainage and environmental protection. At the same time, the hydrostatic level meter is also widely used in urban water supply and drainage, sewage treatment, groundwater, reservoir dams, rivers, oceans and other water level monitoring fields.

Company Introduction

 Xi'an Dehou Electronic Technology Co., Ltd. is a high-tech enterprise specializing in research and development, production, sales of industrial automation instruments and providing Internet of Things solutions.

At present, the company has obtained more than 100 patents and more than 20 soft patents. It has passed IS09001 quality management, IS014001 environmental management, IS045001 Occupational Health and safety management, Occupational Health and Safety Management, GBT29490 Intellectual Property Management, military standard, information security and other system certification and EU CE certification, Russian EAC certification, ATEX explosion-proof certification and SIL certification and other qualifications.

The company is committed to the system integration of process measurement, control, management and other aspects of the system and the development, development, production, sales and service of intelligent instruments and instruments of the Internet of Things.At present, it has metering level FM radar level, pulse radar level, radio frequency guide level, liquid level of magnetover, magnetoexpansion level, sound fork density (level), pressure, flow, multi-point thermometer, analysis, system and tank area meter.The products are widely used in petrochemical industry, coal chemical industry, metallurgy, electric power, building materials, food and medicine and environmental protection water treatment and other industries.

The company can provide customers with location, pressure, temperature, flow, measurement requirements of analytical instruments and cooperation of the Internet of T scheme.