Product Overview

This level transmitter uses a high-performance diffused silicon piezoresistive pressure sensor as the measuring element to accurately measure the hydrostatic pressure of the liquid, which is directly proportional to the liquid level depth, and converts it into a standard (current or voltage) signal output through a signal conditioning circuit, establishing a linear corresponding relationship between the output signal and the liquid depth to realize liquid depth measurement. The product features high accuracy and a compact size, and can be directly immersed in the liquid to measure the liquid height from the end of the transmitter to the liquid surface, making it convenient to use. It is suitable for liquid level measurement and control in petroleum, chemical, power plant, urban water supply, and hydrological survey fields.

Product Features

With this structure, the sensor part immersed in the liquid is a fully sealed stainless steel structure, while the electronic circuit housing is made of cast aluminum structural parts, installed in a location convenient for wiring, making calibration and wiring easy;

Performance Parameters

Range:          0～0.5m…200m water column                       

Pressure type:          gauge pressure, absolute pressure                             

Power supply:          24VDC、12VDC                           

Output signal:          4～20mA、1～5V、0～5V                   

Compensation temperature:          -10～70℃                               

Operating temperature:          -40～85℃                               

Storage temperature:          -40～125℃                             

Zero temperature drift:      ±2%FS                                 

Sensitivity temperature drift:    ±2%FS                                 

Overload pressure:          150%FS                                 

Mechanical vibration:          20g（20-5000HZ)                         

Shock:              100g（11ms）                           

Overall accuracy:          0.1、0.3、0.5 class optional                     

Long-term stability:        ±0.2%FS/year                             

Response time:          ≤1ms（rising to 90％FS）                   

Insulation:             100MΩ/250VDC                           

Material:              junction box low-copper aluminum alloy; level probe all stainless steel     

                   cable material polyurethane lead wire                     

Media compatibility:          various media compatible with 316L stainless steel             

Protection rating:          IP65                                   

Working Principle

Using the hydrostatic pressure measurement principle

When the level transmitter is immersed to a certain depth in the measured liquid, the pressure on the sensor's liquid-facing surface is P=p.g.H+PO, where:

P: pressure on the sensor's liquid-facing surface　　　　　 unit: Pa

p: density of the measured liquid,　　　　　　　　　　 unit: kg/m3

g: local gravitational acceleration,　　　　　　　　　 unit: m/s2

Po: atmospheric pressure above the liquid surface,　　　　 unit: Pa

H: depth of the sensor immersed in the liquid　　　　　 unit: m

At the same time, the atmospheric pressure PO above the liquid surface is introduced into the back-pressure chamber of the sensor through the vented cable to offset the PO on the sensor's liquid-facing surface, so that the pressure measured by the sensor is: P=O.gH. Obviously, by measuring the pressure P, the liquid level depth H can be obtained, and the pressure signal sensed by the sensor is converted and amplified by the circuit and output as a standard signal after compensation

Product Classification

Submersible, straight rod, flange type, threaded type, capacitive type, screw-in type, and float ball type structural designs are available, with anti-clogging design, easy installation, convenient use, strong interchangeability, high sensitivity of the high-quality sensor, fast response speed, accurate reflection of subtle changes in flowing or static liquid levels, and high measurement accuracy.

This new type of transmitter is produced using advanced foreign technology and equipment. Key raw materials, components, and parts are all imported. The complete unit undergoes strict assembly and testing. This product features advanced design principles, a complete range of types and specifications, and easy installation and use.

The submersible level transmitter uses a high-performance diffused silicon piezoresistive pressure sensor as the measuring element. Through highly reliable amplification processing circuits and precise temperature compensation, it converts the gauge pressure or absolute pressure of the measured medium into standard voltage or current signals. This product is compact and easy to use and install, and can be directly immersed in water to measure the liquid level height to the liquid surface.

Features: adopts advanced circuit processing technology, with stable performance and high sensitivity; multiple ranges are available, with a maximum measurable depth of 200m (water column pressure); uses a 316L stainless steel isolation diaphragm, suitable for various measurement media; flexible configuration, with different configurations available according to needs.

Product Applications:

Liquid level measurement and control in industrial sites, urban water supply and sewage treatment, petroleum, chemical industry, power plants, hydrological monitoring, reservoirs, dams, hydropower construction, and other fields.

Product features: reverse polarity and current limiting protection; laser trimming temperature compensation, zero point and range can be adjusted on site; wide range and corrosion resistance, suitable for various media; strong overload and anti-interference capability, with stable performance.

Extended Products

Lightning protection level transmitter foldable

The lightning protection level transmitter encapsulates the OEM oil-filled sensing element inside a stainless steel housing. The front protective cap protects the sensor diaphragm and also allows the liquid to smoothly

contact the diaphragm. The waterproof lead wire is sealed and connected to the housing, and the vent tube is connected to the atmosphere inside the cable. The internal structure is designed to prevent condensation. A three-stage lightning protection module is also designed in the internal circuit, which can effectively prevent damage from induced lightning.

Armored level transmitter foldable

This product can be directly thrown into the bottom of the liquid to measure the height from the sensor at the end to the liquid level surface. It is easy to install, highly reliable, and suitable for liquid level measurement in open containers or applications requiring insertion installation.

Advantage Analysis

The level transmitter can convert changes in various material level parameters into standard current signals and transmit them remotely to the operation control room for centralized display, alarm, or automatic control by secondary instruments or computers. Its good structure and installation method make it suitable for continuous detection of liquid level, material level, or object level under special conditions such as high temperature, high pressure, strong corrosion, easy crystallization, anti-clogging, anti-freezing, as well as solid powder and granular materials. It can be widely used in detection and control in various industrial processes.

After-sales Service

I. Quality Assurance Service 

(1) The product quality implements the three guarantees 

  The product warranty period is one year from the date of delivery. During the warranty period, if there is a quality problem with the product itself, our company provides free repair, replacement, and return services. 

   1. If general parts of the product fail and normal use can be restored after replacement, we are responsible for free timely repair; 

   2. If major parts of the product fail and cannot be repaired on time, a qualified product of the same model and specification will be replaced; 

(2) Disclaimer scope 

  During the warranty period, product failures caused by the following human factors and force majeure are not covered by the free repair, replacement, and return service scope:

   1. The usage occasion is inconsistent with the parameters in the order contract;

   2. Product failure caused by improper use by the customer; 

   3. Customer repairs or modifies the product without authorization; 

   4. The product appearance is severely damaged or deformed, the product identification is lost, and the product source cannot be identified; 

   5. Product damage caused by natural disasters such as earthquakes, floods, fires; 

   6. Human factors. 

II. Lifetime product maintenance service 

 For faulty products beyond the warranty period and within the disclaimer scope, our company will provide lifetime maintenance for your product, only charging maintenance cost fees and product transportation costs. 

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has mainly been engaged in the R&D and production of pressure, level, temperature, differential pressure, digital display, weighing, and flow instruments. Main products include Swiss metallux ceramic piezoresistive sensors and self-developed ceramic capacitive pressure sensors. Diffused silicon, ceramic piezoresistive, strain gauge, metal capacitive, ceramic capacitive pressure transmitters, remote pressure transmitters, high-temperature pressure transmitters, flush diaphragm pressure transmitters, anti-corrosion pressure transmitters, integrated/split level transmitters, anti-corrosion level transmitters, lightning protection level transmitters, high-temperature guided pressure level transmitters, straight rod level transmitters, flange level transmitters, wind pressure transmitters, metal capacitive differential pressure transmitters, diffused silicon differential pressure transmitters, pressure controllers, thermocouples/RTDs, temperature transmitters, and ultrasonic level meters.

Precautions 1. All supplied products are accompanied by a product certificate and instruction manual, including product number, technical parameters, wiring, factory date, etc. Please check carefully to avoid misuse. 2. Wiring should be carried out strictly in accordance with our company's instructions for use. 3. This product is a precision instrument. Random disassembly, collision, dropping, or poking the sensor with sharp tools is prohibited. 4. The transmitter can work immediately after power-on, but the output becomes stable after preheating for 30 minutes. 5. If any abnormality is found during use, turn off the power, stop using it, inspect it, or directly contact our company's technical department. 6. During transportation and storage, restore the original packaging and store in a cool, dry, and ventilated warehouse. 7. The quality warranty period is 12 months (damage caused by improper use such as pressure overload and wiring errors is not covered by the quality warranty). 8. Special products are customized products, do not participate in 7-day no-reason return, custom-made products have a lead time, and are non-returnable and non-exchangeable.