是基于所测液体静压与该液体高度成正比的原理，采用扩散硅或陶瓷敏感元件的压阻效应，将静压转成电信号。 The input liquid level transmitter is based on the principle that the measured static pressure of the liquid is proportional to the height of the liquid, and uses the piezoresistive effect of diffused silicon or ceramic sensitive elements to convert the static pressure into an electrical signal. After temperature compensation and linearity correction. Converted into 4-20mADC standard current signal output. The sensor part of the drop-in liquid level transmitter can be directly poured into the liquid, and the transmitter part can be fixed by a flange or a bracket, which is extremely convenient to install and use.
The input-type liquid level transmitter has good stability and high accuracy. The input-type liquid level transmitter is directly input into the measured medium, which is quite convenient to install and use.
Solid structure, no moving parts, high reliability, long service life. It can measure from water, oil and paste with high viscosity. It is not affected by the bubbling, deposition and electrical characteristics of the tested medium. Temperature compensation. The input level transmitter has reverse polarity protection for power supply and overload current limit protection.
Technical index measurement range: 0.3 ～ 110m
Accuracy: 0.2, 0.5, 1.0 grade Working temperature: -20 ～ 80 ℃
Output signal: 2-wire 4 ～ 20mADC
Power supply voltage: standard 24VDC (12 ～ 36VDC)
Insensitive area: ≤ ± 1.0% FS
Load capacity: 0-600Ω
Relative temperature: ≤85%
Protection level: IP68
Explosion-proof mark: ExiaⅡCT4-7
是引进美国N·Va公司先进的扩散硅压力传感器和BB公司电路技术开发而成的，它应用了硅精蚀工艺和硅晶片叠合两项世界尖端技术，是一种高品质的静压式液位测量仪表，荣获93年北京市高新技术产品称号。 The input type liquid level transmitter was developed by introducing the advanced diffusion silicon pressure sensor of N · Va Company in the United States and the circuit technology of BB Company. It uses the two world-leading technologies of silicon etching and silicon wafer stacking. A high-quality static pressure level measuring instrument, won the title of Beijing High-tech Product in 1993. Widely used in liquid level measurement in petroleum, chemical, metallurgy, environmental protection, food, water conservancy, urban water supply, oil fields and other industries. The outstanding quality of ALY liquid level transmitter meets the needs of China's industrial automation and measurement automation in some industries for high-precision liquid level detection instruments.
Good stability, high accuracy, high performance / price ratio directly into the measured medium, easy installation and use, solid structure, no moving parts, high reliability, long service life from water, oil to pastes with large viscosity Both can perform high-precision measurement without being affected by the blistering, deposition, and electrical characteristics of the measured medium. There is no material fatigue and wear. It is not sensitive to vibration and shock. Wide range temperature compensation. It has reverse polarity protection and overload current limit protection.
Using the principle of static pressure measurement When the liquid level transmitter is put into a certain depth in the measured liquid, the pressure on the sensor's liquid surface is: P = pgH + P ·
In the formula:
P: pressure of the sensor facing the liquid surface, unit: Pa
p: measured liquid density, unit: kg / m3
g: local gravity acceleration, unit: m / s2
p ·: atmospheric pressure on the liquid surface, unit: Pa
H: Depth of liquid input by the sensor, unit: m
At the same time, the atmospheric pressure P · on the liquid surface is introduced into the back pressure cavity of the sensor through the air-conducting cable to offset the P · on the liquid front of the sensor, so that the pressure measured by the sensor is: P = pgH
Obviously, by measuring the pressure P, the liquid level depth H can be obtained. The pressure signal sensed by the sensor is converted and amplified by the circuit, and then output as a standard signal after compensation.
适用与316不锈钢，丁腈橡胶，聚氯乙烯共存的介质，法兰式可测没强腐蚀性介质。 Applicable medium: The input type liquid level transmitter is suitable for the medium coexisting with 316 stainless steel, nitrile rubber, and polyvinyl chloride. The flange type can measure no strong corrosive medium.
Measuring range: 0-Im to -1200m
Accuracy: 0.25%; 0.1%; 0.5%
Working temperature: -20 ℃ － + 80 ℃ (there is no crystal in the medium)
Storage temperature: -40 ℃ － + 125 ℃
Zero temperature coefficient: ± 0.015% of range / ℃
Range temperature coefficient: ± 0.015% of range / ° C
Long-term stability: ± 0.1% of range / year Power supply voltage: 12-36VDC Standard 24VDC
Output signal: two-wire 4-20mADC
Load characteristics: see Figure 1, load resistance ≤600Ω at standard 24VDC
Allowable overload: 3 times current limit protection of standard range: Under overload conditions, the power limit is nominally 26mA
Protection level: IP68
Explosion-proof grade: iaⅡCT5
4. Structure and Material Transmitter relay box: cast aluminum, 90 × 73 × 110, shell epoxy resin spray transmitter probe: 1Cr18Ni9Ti, 29 × 150mm
Air guide cable: 6-core PVC cable with diameter Φ7 Weight (excluding air guide cable): about 0.6kg