The precise input type liquid level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid, and uses the piezoresistive effect of diffused silicon or ceramic sensitive elements to convert static pressure into electrical signals. After temperature compensation and linear correction. convert to4-20mADCStandard current signal output. The sensor part of the precision input type liquid level transmitter can be directly inserted into the liquid, and the transmitter part can be fixed with flanges or brackets, making installation and use extremely convenient.

catalogue

characteristic

Working principle

Specification

model selection

Advantage Analysis

Related product introduction

characteristic

Typical application areas:

Correct installation

Commissioning method

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characteristic

Working principle

Specification

model selection

Advantage Analysis

Related product introduction

characteristic

Typical application areas:

Correct installation

Commissioning method

expand

Edit the characteristics of this paragraph

Good stability and high accuracy

The precise input type liquid level transmitter is directly input into the measured medium, making installation and use quite convenient.

Solid state structure, no movable parts, high reliability, long service life. High precision measurement can be carried out from water and oil to viscous paste, without being affected by the foaming, deposition, and electrical characteristics of the measured medium. Wide range temperature compensation. The precise input type liquid level transmitter has power reverse polarity protection and overload current limiting protection.

Edit the working principle of this paragraph

Principle of static pressure measurement:

When the liquid level transmitter is inserted into a certain depth of the measured liquid, the pressure formula on the sensor facing the liquid level is: Ρ=ρ.g.H + Po

In the formula:

PPressure exerted on the liquid surface of the transmitter

Accurate input type liquid level transmitter

ρ: Density of the tested liquid

gLocal gravity acceleration

PoAtmospheric pressure on the liquid surface

HDepth of immersion of the transmitter into the liquid

At the same time, the pressure of the liquid is introduced into the positive pressure chamber of the sensor through gas guiding stainless steel, and then the atmospheric pressure on the liquid surface is adjustedPoConnected to the negative pressure chamber of the sensor to counteract the pressure on the back of the sensorPo, so that the pressure measured by the sensor is: ρ.g.HObviously,By measuring pressureP, can obtain the depth of liquid level

Anti corrosion liquid level transmitter

Edit the main technical indicators of this paragraph

Measurement range:0.3～110m

Accuracy:0.2、0.5、1.0level

Working temperature:-20～80℃

Output signal: two-wire system4～20mADC

Power supply voltage: standard24VDC（12～36VDC）

Non sensitive area: ≤±1.0%FS

Load capacity:0-600Ω

Relative temperature: ≤85%

Protection level:IP68

Explosion proof mark:ExiaⅡCT4-7

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Product Selection

Edit this paragraphAdvantage Analysis

Accurate input type liquid level transmitterIt can convert changes in various level parameters into standard current signals, which can be remotely transmitted to the operation control room for centralized display, alarm or automatic control by secondary instruments or computers. Its good structure and installation method can be applied to continuous detection of liquid level, material level or material level under special conditions such as high temperature, high pressure, strong corrosion, easy crystallization, anti blockage, anti cold formation, and solid powder and granular materials. It can be widely used for detection and control in various industrial processes.

characteristic:

Simple structure: Without any movable or elastic components, it has extremely high reliability and minimal maintenance.

Easy installation: The built-in structure particularly demonstrates this feature, without the need for any specialized tools.

Easy adjustment: The zero position and range potentiometers can be used to freely shift the zero position or change the range within the effective range of liquid level detection, and the two adjustments do not affect each other.

Widely applicable; Suitable for liquid level measurement in media with high temperature, high pressure, strong corrosion, etc.

mainTECHNICAL INDEX

Effective detection range:0-0.2-20m

Accuracy:0.5Level1Level1.5level

Pressure bearing range: negative pressure, normal pressure, high pressure(32MPabelow)

Working temperature:-50～240℃

environmenttemperature：-20～75℃

Applicable medium: acid, alkali, salt or any medium that is non corrosive to polytetrafluoroethylene

Output signal:4-20mASecond line system

Power supply: load resistance0-750ΩDC24V

Fixed method: threaded installationM20×1.5、M27×2 flange mountingDN15、DN25、DN50、DN80.

On site display: simulated display0-100%Digital display, on-site depth

Edit this paragraphRelated product introduction

Accurate input type liquid level transmitterZLM6Specific parameters of the series

ZLM6The series of precise input type liquid level transmitters is from Changsha ZetianZLM6The representative product of the family series of precise input type liquid level transmitters, with superior performance indicators leading various well-known domestic brands of precise input type liquid level transmitters, surpassing similar world-class precise input type liquid level transmitter products. Its ultra-high cost-effectiveness makes it2009The annual sales volume leads the country in similar precision input type liquid level transmitter products.

ZLM6Series precision input type liquid level transmitter

Edit this paragraphcharacteristic

1Flexible installation,Easy to use, accurate and simple to use, can be displayed on site

2Signal isolation amplification, truncated interference design, strong anti-interference ability

3: Anti condensation, anti lightning protection,anti-corrosion,Anti clogging design

4Probe diameter19mm～42mmoptional

5: Reverse wiring and overvoltage protection, current limiting protection

6Wide price range, convenient to choose from

Edit this paragraphTypical application areas:

Accurate input type liquid level transmitters are widely used for liquid level measurement and control in rivers, groundwater levels, reservoirs, water towers, and containers. It is a sensor that measures the pressure of a liquid and converts it into a liquid level. The principle is that the measured liquid static pressure is directly proportional to the height of the liquid. Precision input type liquid level transmitters can be divided into two types: whether they need to have a display and whether they need remote transmission. The sensor core usually adopts diffused silicon piezoresistive, ceramic capacitor or sapphire, which has the characteristics of high measurement accuracy, compact structure, and good stability.
When choosing a precise input type liquid level transmitter, the application scenario should be considered first. If it is used in a corrosive environment, a high protection level and anti-corrosion sensor should be selected. Attention should also be paid to the size of the liquid level sensor range and the requirements of the interface. Shanghai Yuyang's input type transmission sensors are widely used in water plants, sewage treatment plants, urban water supply, high-rise water tanks, wells, mines, industrial water tanks, water tanks, oil tanks, oil tanks, hydrogeology, reservoirs, rivers, oceans and other occasions for liquid level measurement. The circuit adopts anti-interference signal isolation amplification, truncation interference design (strong anti-interference ability, lightning protection), overvoltage protection, current limiting protection, impact resistance, anti-corrosion and other designs, which have been unanimously recognized by manufacturers.

Edit this paragraph for correct installation

Precautions for the use and installation of precision input type liquid level transmitters:

1.When transporting and storing liquid level transmitters, they should be returned to their original packaging and stored in a cool, dry, and ventilated warehouse.

2.If any abnormalities are found during use, the power should be turned off, the use should be stopped, and a check should be conducted

3.When connecting the power supply, strictly follow the wiring instructions.

How to install a precise input type liquid level transmitter:

When installing a liquid level gauge in a stationary deep well or water tank, the inner diameter of the gauge is usually set to Φ45mmLeft and right steel pipes(Make several small holes at different heights to allow water to enter the pipe smoothly)Fixed in water, then place the precise input type liquid level transmitter into the steel pipe for use. The installation direction of the transmitter is vertical, and the installation position of the immersion type should be far away from the liquid inlet and outlet and the agitator. In situations where there is significant vibration, steel wire can be wrapped around the transmitter to reduce vibration and prevent cable breakage. When measuring the liquid level of flowing or stirred liquids, the inner diameter Φ45mmLeft and right steel pipes(Drill several small holes at different heights on the opposite side of the liquid flow direction to allow water to enter the pipe smoothly)Fixed in water, then place the precise input type liquid level transmitter into the steel pipe for use.

How to solve the anti-interference problem of precision input type liquid level transmitter

The precise input type liquid level transmitter has good stability, high accuracy, and is quite easy to install and use. In daily use, it will be influenced by many factors. To enable users to better use precise input type liquid level transmitters and provide the following solutions for consumers.

Firstly, everyone used traditional methods to solve the problem but did not achieve good results. For this traditional method, which is to measure the liquid level of a small water tank on the measuring device, the pressure transmitter is installed at the bottom of the water tank, and the sensor wire is well wired. But there is a problem, when there is water flowing down from the top of the water tank, it will cause the pressure below to swing significantly. Analyzing the data, using1Extract one data per second, which shows a significant fluctuation and contains the correct values;use10msTaking an average number does not yield good results. How to solve it?

Solution to anti-interference problem of precision input type liquid level transmitter:

Avoid direct pressure impact on the probe when the liquid flows downwards, or use other objects to block the direct pressure impact when the liquid flows downwards;

Install the water inlet into a shower style, cut off a large stream of water into a small stream and spray it out, the effect is quite good;Bend the inlet pipe slightly upwards, so that the water will first be thrown into the air and then fall when it comes out, reducing direct impact(Convert kinetic energy into potential energy).

Edit this paragraph on debugging methods

The precision input type liquid level transmitter has been accurately calibrated according to the range indicated on the nameplate at the factory. As long as the density and other parameters of the medium meet the requirements of the nameplate, there is generally no need to adjust them. However, it is necessary to adjust the range or zero position. Please calibrate according to the following method:
　　1Remove the protective cover and connect it to the external standard24VDCPower supply and ammeter (requirements)0.2%Can be adjusted with a precision level of (or above)
　　2When there is no liquid in the precise input type liquid level transmitter, adjust the zero point resistor to output current4mA
　　3Accurate input type liquid level transmitter adds liquid to full range, adjusts the full range resistor to output current20mA
　　4Repeat the above steps two or three times until the signal is normal
　　5Please enter separately25%、50%、75%Accurate signal verification of input type liquid level transmitter error
　　6For non-aqueous media, when calibrating a precise input type liquid level transmitter with water, the pressure generated by the actual density of the medium used should be converted. For example, the density of the medium is1.3When verifying1mWhen measuring range, it is necessary to use1.3mWater level calibration
　　7After adjustment, tighten the protective cover
　　8The calibration cycle for precision input type liquid level transmitters is once a year