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 small size, and can be directly immersed into 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 a cast aluminum structural part, installed in a location convenient for wiring, making calibration and wiring easier;

Performance Parameters

Measuring 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 liquid to be measured, the pressure on the liquid-facing surface of the sensor is P=p.g.H+PO, where:

P: pressure on the liquid-facing surface of the sensor　　　　　　 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: immersion depth of the sensor 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 acting on the liquid-facing surface of the sensor, 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, then output as a standard signal after compensation

Product Classification

Immersion type, straight rod type, flange type, threaded type, inductive type, screw-in type, float type structural designs, with anti-clogging design, simple installation, convenient use, strong interchangeability, high sensitivity of high-quality sensors, fast response speed, accurate reflection of subtle changes in flowing or static liquid levels, and high measurement accuracy.

The new type of transmitter produced with advanced foreign technology and equipment uses imported key raw materials, components, and parts. The complete machine undergoes strict assembly and testing. This product features advanced design principles, complete varieties 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 a highly reliable amplification processing circuit and precise temperature compensation, it converts the gauge pressure or absolute pressure of the measured medium into a standard voltage or current signal. This product is compact and easy to install and use, and can be directly immersed in water to measure the liquid level height to the liquid surface.

Features: advanced circuit processing technology, stable performance, and high sensitivity; multiple ranges, with a maximum measurement of 200m(water column pressure); adopts a 316L stainless steel isolation diaphragm, suitable for a variety of measuring media; flexible configuration, with different configurations selectable as needed.

Product Applications:

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

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

Extended Products

Lightning protection level transmitter folding

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

come into contact with the diaphragm. The waterproof lead wire is sealed and connected to the outer shell, and the vent tube inside the cable communicates with the atmosphere. The internal structure is designed to prevent condensation. A three-level lightning protection module is also designed in the internal circuit, which can effectively prevent damage caused by induced lightning.

Armored level transmitter folding

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

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 excellent 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-blocking, anti-freezing, and solid powdery or granular materials, and it can be widely used in detection and control in various industrial processes.

After-sales Service

I. Quality Assurance Service 

(1) Product quality implements the three guarantees 

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

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

   2. If major parts of the product fail and cannot be repaired on time, replace them with qualified products of the same model and specification; 

(2) Scope of disclaimer 

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

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

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

   3. The customer repairs or modifies the product without authorization; 

   4. Severe appearance damage and deformation of the product, loss of product identification, making it impossible to identify the source of the product; 

   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 or within the disclaimer scope, our company will provide lifetime maintenance for your products, only charging maintenance cost fees and product transportation costs. 

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has been mainly 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 gauges.

Notes 1. All supplied products are accompanied by a product certificate and instruction manual, including product number, technical parameters, wiring, date of manufacture, 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, and poking the sensor with sharp tools are 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, the power should be turned off, use should be stopped, and inspection should be carried out, or contact our company's technical department directly. 6. During transportation and storage, restore the original packaging and store it 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 incorrect wiring is not covered by the quality warranty). 8. Special products are customized products and do not participate in the 7-day no-reason return policy. Customized products have a delivery lead time and are not returnable or exchangeable.