Product Overview

This level transmitter uses a high-performance diffused silicon piezoresistive pressure sensor as its measuring element. It accurately measures the hydrostatic pressure of the liquid, which is proportional to the liquid level. The measured pressure is then converted into a standard (current or voltage) signal output through a signal conditioning circuit, establishing a linear relationship between the output signal and the liquid depth, thus enabling the measurement of liquid depth. The product is highly accurate, compact, and can be directly immersed in liquid to measure the liquid height from the transmitter tip to the liquid surface, making it easy to use. It is suitable for level measurement and control in the petroleum, chemical, power plant, urban water supply, and hydrological exploration fields.

Features

The sensor part immersed in the liquid is a fully sealed stainless steel structure, while the electronic circuit housing is a cast aluminum structure. It is installed in a convenient location for wiring, making it easy to adjust and connect.

Performance parameters

Measurement range: 0～0.5m…200m water column

Pressure type: Gauge pressure, Absolute pressure

Power supply: 24VDC, 12VDC

Output signals: 4～20mA, 1～5V, 0～5V

Compensation temperature: -10～70℃

Operating temperature: -40～85℃

Storage temperature: -40～125℃

Zero-point temperature drift: ±2%FS

Sensitivity temperature drift: ±2%FS

Overload pressure: 150%FS

Mechanical vibration: 20g (20-5000HZ)

Impact: 100g (11ms)

Overall accuracy: 0.1, 0.3, and 0.5 levels are selectable.

Long-term stability: ±0.2%FS/year

Response time: ≤1ms (up to 90% FS)

Insulation: 100MΩ/250VDC

Materials: Junction box made of low-copper aluminum alloy; Liquid level probe made entirely of stainless steel.

Cable material: polyurethane conductor

Media compatibility: Compatible with a wide range of media for 316L stainless steel.

Protection rating: IP65

Working principle

Principle of hydrostatic measurement

When the level transmitter is submerged to a certain depth in the liquid being measured, the pressure on the sensor's liquid-facing surface is P = pgH + PO, where:

P: Pressure on the liquid-facing surface of the sensor (Pa)

p: Density of the liquid being measured, unit: kg/m³

g: Local gravitational acceleration, unit: m/s²

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

H: Depth of liquid immersed by the sensor (in meters)

Simultaneously, atmospheric pressure PO above the liquid surface is introduced into the back pressure chamber of the sensor via a gas-conducting cable to reduce the PO above the liquid surface, so that the sensor measures the pressure as: P = 0.gH. Obviously, by measuring the pressure P, the liquid level depth H can be obtained. The pressure signal sensed by the sensor is converted, amplified, and compensated before being output as a standard signal.

Product Categories

The sensor features various structural designs including submersible, rod, flange, threaded, inductive, screw-in, and float types, with anti-clogging design. It is easy to install, convenient to use, and highly interchangeable. The high-quality sensor has high sensitivity, fast response speed, accurately reflects subtle changes in the flowing or static liquid surface, and has high measurement accuracy.

The new transmitter, produced by introducing advanced foreign technology and equipment, uses key raw materials, components and parts all sourced from imports. The entire unit undergoes rigorous assembly and testing. This product features advanced design principles, a complete range of specifications, and ease of 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 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, easy to use and install, and can be directly immersed in water to measure the liquid level.

Features: Utilizes advanced circuit processing technology for stable performance and high sensitivity; multiple measurement ranges, with a maximum measurement range of 200m (water column pressure); employs a 316L stainless steel diaphragm suitable for various measurement media; flexible configuration options are available to suit different needs.

Product Applications:

Liquid level measurement and control in industrial sites, urban water supply and sewage treatment, petroleum, chemical, power plant, hydrological monitoring, reservoir, dam, and hydropower construction.

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 capabilities, stable performance.

Extended Products

Lightning-proof liquid level transmitter folding

The lightning-protected level transmitter encapsulates the OEM-filled oil core within a stainless steel housing. The protective cap at the front end protects the sensor diaphragm while also ensuring smooth liquid flow.

Upon contact with the diaphragm, the waterproof wire is sealed to the outer casing, and the vent pipe is located inside the cable, allowing it to communicate with the atmosphere. The internal structure is designed to prevent condensation. Furthermore, a three-stage lightning protection module is incorporated into the internal circuitry to effectively prevent damage from induced lightning strikes.

Armored level transmitter folding

This product can be directly inserted 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 where insertion is required.

Advantages Analysis

A level transmitter converts changes in various level parameters into a standard current signal, which is then transmitted to the control room for centralized display, alarm, or automatic control by secondary instruments or computers. Its superior structure and installation make it suitable for continuous level detection under special conditions such as high temperature, high pressure, strong corrosion, easy crystallization, anti-clogging, anti-cold condensation, and solid powder or granular materials. It can be widely used in detection and control in various industrial processes.

After-sales service

I. Quality Assurance Service

(a) Product quality is covered by a three-guarantee policy.

The product warranty period is one year from the date of delivery. During the warranty period, our company provides free repair, replacement, and return services for any product quality issues.

1. If a product's general components fail and can be replaced to restore its functionality, we will be responsible for free repairs on schedule.

2. If the main components of the product fail and cannot be repaired on schedule, replace them with qualified products of the same model and specifications.

(ii) Scope of Exemption

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

1. The application scenario is inconsistent with the parameters specified in the purchase contract;

2. Product malfunction caused by improper customer use;

3. Customers repair or modify the product themselves;

4. The product's appearance is severely damaged or deformed, and the product label is missing, making it impossible to identify the product's origin;

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

6. Human factors.

II. Lifetime product repair service

For products that are beyond the warranty period or fall within the scope of liability exemption, our company will provide lifetime repair services, charging only for repair costs and product transportation fees.

Xi'an Shenghongchuang Instrument Co., Ltd., since its establishment, has been primarily engaged in the research and development and production of pressure, level, temperature, differential pressure, digital display, weighing, and flow meters. Its main products include Swiss Metallux ceramic piezoresistive sensors and independently developed ceramic capacitive pressure sensors. Other products include diffused silicon, ceramic piezoresistive, strain gauges, metal capacitors, ceramic capacitor pressure transmitters, remote pressure transmitters, high-temperature pressure transmitters, flat diaphragm pressure transmitters, corrosion-resistant pressure transmitters, integrated/split-type level transmitters, corrosion-resistant level transmitters, lightning-protected level transmitters, high-temperature conductive level transmitters, straight rod level transmitters, flange level transmitters, wind pressure transmitters, metal capacitor differential pressure transmitters, diffused silicon differential pressure transmitters, pressure controllers, thermocouples/resistance temperature transmitters, and ultrasonic level gauges.

Precautions: 1. All supplied products come with a product certificate and instruction manual, including product number, technical parameters, wiring information, and manufacturing date. Please check carefully to avoid incorrect use. 2. Wiring should be strictly performed according to our company's instructions. 3. This product is a precision instrument; do not disassemble, impact, drop, or poke the sensor with sharp objects. 4. The transmitter can work immediately after being powered on, but the output will stabilize after a 30-minute warm-up period. 5. If any abnormality is found during use, turn off the power, stop using the product, and inspect it, or contact our technical department directly. 6. During transportation and storage, restore the original packaging and store in a cool, dry, and ventilated warehouse. 7. The quality guarantee period is 12 months (damage caused by improper use such as pressure overload or incorrect wiring is not covered by the quality guarantee). 8. Special products are custom-made and are not eligible for the 7-day no-reason return policy. Custom-made products have a lead time and are non-refundable and non-exchangeable.