The static pressure level transmitter is suitable for the liquid level measurement of various media in petrochemical, metallurgy, electric power, pharmaceutical, water supply and drainage, environmental protection and other systems and industries. Delicate structure, simple adjustment and flexible installation for users to easily use provides convenience. 4 ~ 20mA, 0 ~ 5v, 0 ~ 10mA and other standard signal suppliers can be selected by users according to their needs.

Advantages of static pressure level transmitter:

1. Solid structure, no moving parts, high reliability, long service life;

2. From water to sewage, from oil to liquid with larger viscosity can be measured with high precision, not affected by the medium foaming, deposition, etc.;

3. With multi-purpose mounting bracket, easy to install and use;

4. With good anti-interference, lightning protection ability;

5. With power supply reverse polarity protection and overload current limiting protection;

6. The new material is not easy to fatigue wear, vibration, impact and overload resistance.

The static pressure level transmitter is based on the principle that the measured hydrostatic pressure is proportional to the height of the liquid, and adopts the piezoresistive effect of foreign advanced isolated diffused silicon sensitive element to convert the static pressure into electrical signal, and then converts it into standard electrical signal through temperature compensation and linear correction. It is suitable for liquid level measurement of various media in petrochemical, metallurgy, electric power, pharmaceutical, water supply and drainage, environmental protection and other systems and industries.

When the level transmitter is put into the measured liquid at a certain depth, the sensor > The pressure on the inward liquid surface is: rho = rho. G h + Po

Chinese:

P: Pressure on the liquid surface of the transmitter

ρ : density of the measured liquid

g: Local gravitational acceleration

Po: atmospheric pressure at the liquid surface

H: The depth of the transmitter into the liquid

At the same time, the liquid pressure is introduced into the positive pressure chamber of the sensor through the gas stainless steel, and then the atmospheric pressure Po on the liquid surface is connected with the negative pressure chamber of the sensor, in order to offset the Po on the back of the sensor, so that the pressure measured by the sensor is: ρ.g.H, obviously, by measuring the pressure P, you can get the depth of the liquid level.

Characteristics of static pressure level transmitter

1, wide range of temperature compensation.

2, good stability, high precision, high performance/price.

3, with power supply reverse polarity protection and overload current limiting protection.

4, directly into the measured medium, installation and use is quite convenient.

5, solid state mechanism, no moving parts, high reliability, long service life.

6, from water, oil to the viscosity of the paste can be high precision measurement, not affected by the measured medium bubbling, deposition, electrical characteristics.

Application of static pressure level transmitter

Static pressure level transmitter is mainly used in urban water supply and drainage, reservoirs, rivers, oceans, oil storage tanks, storage of paste or mud tanks and petroleum, chemical, power plants and other departments of water level and open container liquid measurement, the measured liquid medium whether water, oil, acid, alkali and viscous liquid can be measured. This is the ideal liquid level converter instrument in the industrial process detection and control system of industrial and mining enterprises.

I. Introduction of static pressure level transmitter:

The two-wire system of the hydrostatic level transmitter consists of a special air guide cable with a built-in capillary tube, a compression connector and a probe. The probe of the hydrostatic level transmitter is constructed of a stainless steel cylinder with a diaphragm at the bottom and is covered by a plastic housing with a hole. The liquid level measurement of the static pressure level transmitter is actually the difference between the hydrostatic pressure and the actual atmospheric pressure on the probe head, and then the ceramic sensor and electronic components will convert the pressure difference into 4 ~ 20mA output signal. The static pressure level transmitter has the characteristics of reliable performance, simple installation and convenient use. Static pressure level transmitter: sinking cable structure, sinking rod structure, straight threaded into structure, straight flange structure, all with flameproof type and safety type.

2. Technical advantages of static pressure level transmitter:

Static pressure level transmitter larger 200m range, stainless steel probe, ceramic diaphragm, rubber seal, long-term stability ≤0.15%/ year, explosion-proof type optional.

Three. Types of static pressure level transmitter:

Static pressure level transmitter is a kind of pressure sensor to measure liquid level. The static pressure level transmitter (liquid level meter) is based on the principle that the measured hydrostatic pressure is proportional to the height of the liquid, using foreign advanced isolation type diffused silicon sensitive element or ceramic capacitive pressure sensitive sensor, the static pressure is converted into electrical signals, and then through temperature compensation and linear correction, converted into standard electrical signals (generally 4 ~ 20mA/1 ~ 5VDC).

Static pressure level transmitter (level gauge) is suitable for the level measurement of various media in petrochemical, metallurgy, electric power, pharmaceutical, water supply and drainage, environmental protection and other systems and industries. Delicate structure, simple adjustment and flexible installation for users to easily use provides convenience. 4 ~ 20mA, 0 ~ 5v, 0 ~ 10mA and other standard signal suppliers can be selected by users according to their needs.

Four, functional features:

Good stability, full degree, zero long-term stability can reach 0.1%FS/ year. The temperature drift is less than 0.1%FS in the compensated temperature range of 0 ~ 70℃ and less than 0.3%FS in the whole allowable operating temperature range.

With reverse protection, current limiting protection circuit, in the installation of the positive and negative connection will not damage the transmitter, abnormal transmitter will automatically limit the current within 35MA.

Solid state structure, no moving parts, high reliability, long service life.

Easy installation, simple structure, economic and durable.

V. Performance and Advantages:

Its mechanical structure has high resistance to overload and corrosive media

High precision, long - term stability of ceramic capacitance and imported diffused silicon measurement unit

The sealed electronic module and double filter pressure compensation system can resist the influence of climate field change

Electronic module can output 4... Module with 20mA signal and overvoltage protection

The integrated temperature sensor Pt100 can be used for both level and temperature measurement.

Vi. Technical Indicators:

Explosion-proof mark: flameproof type dllCT6 (without acetylene),

Full measurement range: 0-2m rod cable 0-20m

Accuracy level: 0.2, 0.5

Long-term stability: Better than 0.1%/ year

Ambient temperature: -20 ~ +30℃

Medium temperature: -20 ~ +60℃

Transmitter protection class: IP65

Sensor protection level: IP68

Power supply voltage: 24VDC;

Transmitter output: 4 ~ 20mA

Transmitter housing material: die-cast aluminum alloy

Static pressure level transmitter mounting side

1. Flange installation: DN32 (HG/T20592/2009) RF sealing surface

2, no fixed device

3, bracket installation