3-wire sensors are widely utilized in the field of industrial automation. Their core principle lies in employing specific circuit designs to compensate for the impact of lead wire resistance on measurement accuracy. The following are prominent brands that excel in the market, along with their representative products:
I. Temperature Measurement Sensors (RTD - Resistance Temperature Detectors)
Suitable for 3-wire temperature measurement applications involving sensors such as PT100 and PT1000, emphasizing high precision and stability.
Fenghui
Specializing in industrial temperature sensing, Fenghui's products feature an IP65 protection rating and EX explosion-proof certification, making them suitable for harsh environments.
Typical Model: Assembled RTD (Resistance Temperature Detector)-a dual-element PT100 3-wire probe supporting a measurement range of -50°C to 500°C.
II. Liquid Level / Distance Measurement Sensors
Primarily used in applications such as water treatment and storage tank monitoring, these sensors frequently employ ultrasonic or radar technologies.
Asmik
A leading domestic brand in sensing technology, Asmik specializes in integrated ultrasonic liquid level meters. These devices support 4-20mA signal output, and their measurement range can be customized up to 60 meters.
Typical Model: 3-wire Ultrasonic Liquid Level Meter-features a wide operating temperature range (-20°C to 80°C) and is suitable for complex outdoor operating conditions.
III. Proximity Switches & Displacement Sensors
Used in automation control processes for tasks such as position detection and stroke control.
F&C (Jiazhun)
Offers M8, M12, and M18 series 3-wire proximity switches supporting both NPN and PNP outputs; widely applied in machine tools and packaging equipment.
Jiangyin Dingzhi
A specialist manufacturer of LVDT (Linear Variable Differential Transformer) displacement sensors. Examples include the Model TD-2 3-wire thermal expansion sensor, which is suitable for monitoring precision equipment such as steam turbines and compressors.
Wuxi Hudai Instrument Factory / Xingzhou Instruments
Manufactures the Model XZCS-3-03-D 3-wire low-speed sensor. Capable of detecting rotational speeds as low as 1 RPM, this sensor is designed to be used in conjunction with intelligent tachometers.
