Using the principle of static pressure measurement:
When the liquid level transmitter is put into the measured liquid to a certain depth, the pressure formula of the sensor facing the liquid level is: ρ = ρ g.h+po.
Among them:
P: the pressure on the liquid level of the transmitter.
ρ: density of liquid to be measured
G: local gravity acceleration
Po: atmospheric pressure above the liquid level
H: Liquid depth input by the transmitter.
At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through the gas-conducting stainless steel, and then the atmospheric pressure Po on the liquid surface is connected with the negative pressure chamber of the sensor to cancel the Po on the back of the sensor, so that the pressure measured by the sensor is ρ .g.H. Obviously, the depth of the liquid level can be obtained by measuring the pressure p.
The liquid level of the liquid medium in the container is called liquid level, and the instrument for measuring liquid level is called liquid level meter. Liquid level gauge is a kind of liquid level gauge.
The types of liquid level meters are tuning fork vibration type, magnetic suspension type, pressure type, ultrasonic type, sonar wave type, magnetic flap type, radar type and so on.
Type:
Magnetic levitation type
1.UHZ-25 magnetic float level gauge and UHZ-27 overhead float level gauge are summarized, which can be equipped with remote liquid level transmitter to realize remote digital/analog display of liquid level signal.
Second, the structural principle My model is an analog liquid level transmitter, which consists of two parts: a liquid level sensor and a signal converter. The liquid level sensor is composed of several reed switch and several resistors installed in φ20 stainless steel protective tube, which is fixed outside the measuring tube (main tube); The signal converter consists of electronic modules and is placed in the explosion-proof junction box at the top or bottom of the sensor. 3. The main technical parameters are 1, and the range is determined by the range h; 2. Error:10mm; 3. Output signal: 4 ~ 20mA. DC (two-wire system); 4. Load resistance: ≤ 550Ω; 5. Power supply voltage: 24V. DC； ; 6. Export: M20× 1.5 (inside); 7. Ambient temperature:-40 ~+60℃; 8. Explosion-proof grade: D Ⅱ BT1-4; 9. Enclosure protection grade: IP65.
Three, the characteristics of magnetic levitation ball level gauge
Magnetic levitation ball level gauge has the advantages of simple structure, convenient use, stable performance, long service life and convenient installation and maintenance.
Four, the application of magnetic levitation ball level gauge
It is widely used for liquid level measurement in petroleum processing, food processing, chemical industry, water treatment, pharmacy, electric power, paper making, metallurgy, ships, boilers and other industries.
Internal floating type
The internal floating double-cavity liquid level gauge (viscous medium liquid level gauge) is a special liquid level measuring instrument developed for high viscous medium by using the technology of JKS Company of Canada. This product is a technical upgrade based on the magnetic float level gauge, which completely overcomes many shortcomings such as inaccurate long-term measurement of viscous medium, liquid sticking to the float in the cavity, difficult maintenance and so on.
The internal floating magnetic level gauge is a double-cavity level gauge. The measured medium is isolated from the cavity at the end of the magnetic panel. After special treatment, the cavity inside the container end and the float are ensured to be linearly transmitted to the magnetic panel with the change of the liquid level, and the height of the liquid level is clearly and accurately indicated. It can display on the spot, give attention to alarm control and output remote transmission signals. It is a multifunctional liquid level measuring instrument and the best liquid level measuring instrument for measuring viscous media.
Magnetic flap
UHZ-45 high temperature and high pressure magnetic trigger level gauge is a kind of level gauge designed by our company to broaden the application scope of UHZ series magnetic trigger level gauge and meet the requirements of electric power, heating and gas supply industries. It adopts a unique heat dissipation method to effectively control the working temperature of the dielectric instrument, avoid demagnetization of magnetic elements at high temperature, and ensure the reliable operation of the instrument. It can measure the high temperature of 450℃ and the high pressure of 25MPa, and it is in a leading position in the same industry in China.
The liquid level gauge is suitable for measuring and controlling the liquid level and boundary position of high temperature and high pressure liquid containers. The liquid level height is clearly indicated, the display is intuitive and eye-catching, and the indicator is completely isolated from the storage tank. It has the advantages of safe use, reasonable design, simple structure, convenient and reliable installation, stable performance, long service life, low maintenance cost and convenient installation and maintenance.
Users can cooperate with the remote transmitter according to the engineering needs, realize local digital display, and output 4~20mA standard remote electrical signals to meet the needs of recording instruments or industrial process control. It can also be used with magnetic control switch or proximity switch to monitor and alarm the liquid level or control the liquid entering and leaving the equipment.
technical parameter
Measuring range: 200...~ 15000 ㎜ (the liquid level gauge exceeds 6000mm or the transportation conditions do not allow it to exceed the length, so it can be purchased and manufactured in sections).
Display accuracy:10mm;
Working pressure: 6.3, 10.0, 16.0, 25.0MPa；;
Medium temperature:-20℃ ~ 450℃;
Medium density: ≥ 0.5g/cm3;
Medium density difference: ≥0. 15g/cm3 (measurement boundary)
Medium viscosity: ≤ 0.4 Pa s;
Process connection: DN20/25 PN 1.0 (implementation standard HG20592~20635-97), other standards can be manufactured according to customer requirements.
Liquid contact materials: 3 16SS, 3 16L, etc.
(according to the chemical properties of the medium and the temperature and pressure used);
Float material: 3 16SS, 3 16L, titanium, etc.
Input type
Input level gauge (static pressure level gauge/liquid level transmitter/liquid level sensor/water level sensor) is a kind of pressure sensor for measuring liquid level. . HAKK-500 static pressure input liquid level transmitter (level gauge) is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid, and adopts foreign advanced isolation diffusion silicon sensor or ceramic capacitance pressure sensor to convert the static pressure into an electrical signal, and then converts it into a standard electrical signal after temperature compensation and linear correction (generally,