Level transmitter

NegotiableUpdate on 12/14

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Nature of the Manufacturer: Producers

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Overview

A liquid level transmitter is an industrial measuring instrument that converts the liquid level height into a standard electrical signal output, widely used for liquid level monitoring and control of various liquid storage containers.

Product Details

Level transmitterCore perception equipment for industrial precision measurement and control

In the field of industrial automation and process control,Level transmitterAs a key parameter sensing component, it provides core data support for production regulation, inventory management, and safety warning by converting the liquid level height of liquid and solid particles into standard electrical signals. From high-pressure storage tanks in the petrochemical industry to clean water tanks for municipal water supply, from raw material tanks for food processing to sewage treatment tanks in the environmental protection field, its precise and reliable measurement capabilities run through many industrial and livelihood scenarios, becoming the 'sensory nerve' that ensures efficient system operation.

Core technology principles and mainstream types

Level transmitterBased on diverse physical principles for measurement, different technological paths have created product types suitable for various working conditions, with core differences reflected in measurement methods, accuracy levels, and environmental adaptability.

Contact measurement series

Differential pressure typeLevel transmitterUsing the pressure difference caused by changes in liquid level height for calculation, precise measurement is achieved through the formula h=Δ P/(ρ g) (where h is the liquid level height, Δ P is the pressure difference, ρ is the fluid density, and g is the gravitational acceleration). Its core advantage lies in its high pressure and high temperature resistance, with a measurement range of 0-30m, an accuracy of ± 0.2% FS, a maximum pressure resistance level of 40MPa, and the ability to adapt to high temperature environments and corrosive media at 350 ℃. The mainstream models such as Yokogawa EJA210E use monocrystalline silicon resonant sensors, which convert differential pressure signals into digital signals through H-shaped vibration beams, and finally output 4-20mA DC standard current and superimpose HART communication signals. They are widely used in scenarios such as oil storage tanks in petroleum refineries.
Static pressure typeLevel transmitterBased on the principle that liquid static pressure is proportional to depth, the sensor measures pressure P=ρ. g.H (after offsetting the influence of atmospheric pressure on the liquid surface), and outputs liquid level data through signal conversion. This type has an accuracy of ± 0.05% FS, a range coverage of 0-25kPa to 100kPa, and a protection level of up to IP68. It can be immersed in liquids and performs stably in scenarios such as sedimentation tanks in sewage treatment plants. It adopts a fully stainless steel structure and gas shielded cable design, ensuring both water tightness and pressure compensation, with a long-term stability of 0.1% FS/year.
float typeLevel transmitterBased on Archimedes' principle, the floating ball drives the reed switch or Hall element through a magnetic coupling device as the liquid level rises and falls, converting mechanical displacement into electrical signals. The product has a simple structure and low cost, with a measurement range of 0-5m and an accuracy of ± 5mm. It is suitable for monitoring low viscosity liquids such as water and oil. In the raw material tanks of the food and beverage production workshop, liquid level alarm and high/low control can be achieved without complex calibration, with an annual failure rate of less than 0.5%.

Non contact measurement series

radar-styleLevel transmitterBy emitting high-frequency electromagnetic waves and receiving reflected signals, the liquid level height is calculated using time difference, which belongs to non-contact measurement products. Its measurement range can reach 0-70m, with an accuracy of ± 2-3mm. It can withstand high temperature, high pressure, and strong corrosive environments, and the data refresh rate can reach once per second. In the monitoring of a chemical plant reactor, the maintenance cycle of this type of product has been extended to 2 years, effectively reducing operation and maintenance costs.
Ultrasonic typeLevel transmitterUsing ultrasonic flight time difference for measurement, with a measurement range of 0-15m and an accuracy of ± 5mm, suitable for open containers and non-conductive media under normal pressure. In the municipal water supply system, it can accurately control the water level of the pool, and with the wireless transmission module, remote monitoring can be achieved, significantly improving operational efficiency.

Key performance parameters and application value

Level transmitterThe core performance is determined by four dimensions: range, accuracy level, environmental adaptability, and output signal. The range should match 120%~150% of the actual liquid level to avoid long-term low-pressure operation affecting the service life; The accuracy level can be selected as needed, with trade settlement reaching ± 0.05% FS, process control optional ± 0.1% FS, and simple monitoring using ± 0.2% FS level. The output signals cover various types such as 4-20mA (two-wire system), RS485 (Modbus protocol), and LoRa/NB IoT wireless transmission, which can adapt to different control system requirements.

In practical applications, its value is reflected in the dual aspects of security and efficiency improvement. After a petrochemical enterprise adopted differential pressure transmitters, the accident rate of crude oil storage tanks decreased by 60%; After the introduction of this equipment in a certain sewage treatment plant, the equipment failure rate decreased by 35% and the treatment efficiency increased by 20%. In the field of environmental protection, non-contact measurement methods avoid the corrosion pollution of media on sensors, extend their service life, and ensure the continuity of monitoring data.

Selection guide and maintenance points

The selection should follow the three principles of 'medium adaptation, environment matching, and accuracy adaptation': static pressure is preferred for medium and low pressure scenarios, radar type is required for high pressure/strong corrosion scenarios, ultrasonic type is suitable for atmospheric open containers, and magnetostrictive type (accuracy ± 0.5mm) should be used for high-precision requirements. In terms of environment, outdoor installation requires an IP67 protection level, corrosive media should be equipped with Hastelloy film sheets, and explosion-proof scenarios must use intrinsically safe products. Bulk purchases (≥ 50 units) can enjoy a discount of 10% -18%, and uniform models can also reduce spare parts inventory and optimize maintenance costs.

In terms of maintenance, contact products need to be regularly checked for sealing performance to avoid medium leakage; Non contact products should keep the probe clean to prevent scaling from affecting signal transmission. Daily calibration can be carried out through a standard pressure source, and wireless models need to regularly check the communication module and power supply status (solar or battery power supply needs to ensure battery life).

Technological development trends

currentLevel transmitterIt is developing towards intelligence, wireless and integration. Intelligent products are equipped with temperature compensation and linear correction algorithms, which can automatically counteract environmental interference; The application of wireless transmission module has achieved unmanned monitoring in remote scenarios; The multi parameter integrated model can simultaneously measure liquid level, temperature, and density, further expanding the application boundaries. In the future, with the deep penetration of industrial Internet,Level transmitterIt will become the core sensing node of the industrial Internet of Things, providing basic data support for the construction of smart factories.