Product Overview

This level transmitter uses a high-performance diffused silicon piezoresistive pressure sensor as the measuring element. It accurately measures the hydrostatic pressure of the liquid, which is proportional to the liquid level, and converts it into a standard (current or voltage) signal output through a signal conditioning circuit, establishing a linear relationship between the output signal and liquid depth to measure the liquid depth. The product features high accuracy and a compact size. It 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 generation, municipal water supply, and hydrological exploration applications.

Product Features

The immersed sensor part of this structure is fully sealed and made of stainless steel, while the electronic circuit housing is made of cast aluminum and can be installed in a convenient location for wiring, facilitating adjustment and connection;

Performance Parameters

Measuring range:         0～0.5m…200mH2O                       

Pressure type:         Gauge pressure, absolute pressure                             

Power supply:         24VDC、12VDC                           

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

Compensated 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 selectable                     

Long-term stability:       ±0.2%FS/year                                         

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

Insulation:            100MΩ/250VDC                                       

Material:               Low-copper aluminum alloy junction box; fully stainless-steel level probe     

                                      Cable material: polyurethane wire                         

Media compatibility:         Various media compatible with 316L stainless steel             

Protection rating:         IP65                                                       

Operating Principle

Hydrostatic pressure measurement principle

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

P: Pressure exerted 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: Depth to which the sensor is 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, offsetting the PO on the liquid-facing surface of the sensor, so that the pressure measured by the sensor is: P=O.gH. Obviously, the liquid-level depth H can be obtained by measuring the pressure P. The pressure signal detected by the sensor is converted and amplified by the circuit, compensated, and then output as a standard signal.

Product Categories

Submersible, straight-rod, flanged, threaded, inductive, screw-in, and float-ball structural designs are available. Anti-blocking designs are also provided. Installation is simple, use is convenient, and interchangeability is strong. The high-quality sensor offers high sensitivity, fast response, and accurate detection of subtle changes in flowing or static liquid levels, providing high measurement accuracy.

This new type of transmitter is manufactured using advanced foreign technology and equipment. Its key raw materials, components, and parts are imported. The complete unit undergoes strict assembly and testing, featuring an advanced design principle, a complete range of specifications, and convenient installation and operation.

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

Features: Advanced circuit processing technology, stable performance, and high sensitivity; multiple measuring ranges, with a maximum measurable range of 200m (water-column pressure); 316L stainless-steel isolation diaphragm, suitable for various measuring media; flexible configuration, with different configurations available as required.

Product Applications:

Liquid-level measurement and control in industrial sites, municipal water supply and wastewater treatment, petroleum, chemical, power generation, hydrological monitoring, reservoirs, dams, hydropower construction, and other fields.

Product Features: Reverse-polarity and current-limiting protection; laser-trimmed resistance temperature compensation, with zero point and range adjustable on site; wide range and corrosion resistance, suitable for various media; strong overload and anti-interference capability, with stable performance.

Extended Products

Lightning-Protected Level Transmitter折叠

The lightning-protected level transmitter encapsulates an OEM oil-filled sensing core in a stainless-steel housing. The protective cap at the front protects the sensor diaphragm and allows the liquid to flow smoothly

and contact the diaphragm. The waterproof cable is sealed and connected to the housing, while the vent tube communicates with the atmosphere inside the cable. The internal structure is designed to prevent condensation. A three-stage lightning protection module is also designed into the internal circuit, effectively preventing damage caused by induced lightning.

Armored Level Transmitter折叠

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

Advantages

The level transmitter converts changes in various level parameters into a standard current signal and transmits it remotely to the operation control room for centralized display, alarm, or automatic control by secondary instruments or computers. Its reliable structure and installation methods make it suitable for continuous detection of liquid level, material level, or bulk level under special conditions such as high temperature, high pressure, strong corrosion, easy crystallization, clogging prevention, and prevention of cold condensation, as well as for solid powdery and granular materials. It can be widely used for detection and control in various industrial processes.

After-Sales Service

I. Quality Assurance Service 

(I) Three Guarantees for Product Quality 

  The product warranty period is calculated from the date of delivery and lasts one year. During the warranty period, if the product has quality problems caused by the product itself, our company provides free repair, replacement, and return services. 

   1. If a general component of the product fails and the product can resume normal operation after replacement, we will repair it free of charge within the specified period; 

   2. If a major component of the product fails and cannot be repaired within the specified period, it will be replaced with a qualified product of the same model and specifications; 

(II) Exclusions 

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

   1. The application conditions are inconsistent with the parameters specified in the purchase contract;

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

   3. Unauthorized repair or modification of the product by the customer; 

   4. Severe damage or deformation of the product appearance, or loss of the product identification label such that the product source cannot be identified; 

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

   6. Human factors. 

II. Lifetime Product Repair Service 

 For products that fail after the warranty period or fall within the exclusions, our company provides lifetime repair service and charges only the repair and transportation costs. 

Since its establishment, Xi'an Shenghongchuang Instrument Co., Ltd. has mainly engaged in the research, development, and production of pressure, level, temperature, differential pressure, digital display, weighing, and flow instruments. Main products include Swiss Metallux ceramic piezoresistive sensors; self-developed ceramic capacitive pressure sensors; diffused silicon, ceramic piezoresistive, strain-gauge, metal capacitive, and ceramic capacitive pressure transmitters; remote pressure transmitters; high-temperature pressure transmitters; flush-diaphragm pressure transmitters; corrosion-resistant pressure transmitters; integrated/remote level transmitters; corrosion-resistant level transmitters; lightning-protected level transmitters; high-temperature guided-pressure level transmitters; straight-rod level transmitters; flanged level transmitters; wind-pressure transmitters; metal capacitive differential pressure transmitters; diffused silicon differential pressure transmitters; pressure controllers; thermocouples/thermoresistance; temperature transmitters; and ultrasonic level meters.

Precautions 1. All supplied products come with a certificate of conformity and instruction manual, which contain the product number, technical parameters, wiring instructions, production date, and other information. Please check them carefully to avoid incorrect use. 2. Wiring must be performed strictly according to our company's instructions for use. 3. This product is a precision instrument. Do not disassemble it arbitrarily, subject it to collision or falling, or puncture the sensor with sharp tools. 4. The transmitter can operate immediately after being powered on, but its output becomes stable after 30 minutes of preheating. 5. If an abnormality is found during use, turn off the power, stop using the product, and conduct an inspection, or contact our technical department directly. 6. During transportation and storage, restore the original packaging and store the product in a cool, dry, and well-ventilated warehouse. 7. The quality warranty period is 12 months (damage caused by improper use, such as pressure overload or incorrect wiring, is not covered by the quality warranty). 8. Special products are customized products and are not eligible for no-reason returns within 7 days. Customized products have a specified lead time and cannot be returned or exchanged.