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Low cost ESMTS150A Half-bridge Human Scale sensor with 50KG

The ESMTS150 miniature cross-shaped load cell is the core force-sensing component of electronic body scales and smart body fat scales. It features a rounded square metal frame and a three-point force structure, ensuring uniform stress distribution and excellent linear deformation, efficiently converting pressure into electrical signals. The core strain area is sealed with white adhesive, offering excellent dust and moisture resistance for long-term use in household environments. It outputs a weak differential signal in a half-bridge configuration, has strong anti-interference capabilities, covers mainstream ranges up to 50kg, provides high resolution, minimal creep and hysteresis errors, and is compact, lightweight, and low-power. It can be seamlessly integrated into portable weighing devices and smart home scenarios, making it an ideal choice for small, high-precision force measurement applications.

product details

Working Principle

When an object is placed on a sensor, gravity causes the elastomer of the sensor to undergo slight elastic deformation. The strain gauges attached to the elastomer also deform accordingly, resulting in a change in their resistance. The strain gauges are usually connected in a Wheatstone bridge circuit, and the change in resistance causes the bridge to become unbalanced, thereby outputting a faint voltage signal proportional to the gravity applied. This signal is then processed through amplification, filtering, and A/D conversion, ultimately converting it into a display of the object's weight.

Product Features

1. Square-frame structure: Uses a rounded square metal frame with internal I-beam stress design, concentrating force and providing good linear deformation, efficiently converting pressure into electrical signals.

2. Three-point force component: Top metal pressure piece is fixed with three rivets, forming a stable force support point, ensuring the load is evenly transmitted to the strain gauge area, improving measurement accuracy.

3. Sealed protective packaging: The core area of the strain gauge is sealed with white colloid, dustproof and moisture-proof, suitable for long-term use in household environments.

4. Slim design: Thin overall thickness and small volume, perfectly fitting the internal space of slim body scales and portable weighing devices.

5. Half-bridge output: Commonly three-wire (red/black/white), output signal is mV-level differential signal, strong anti-interference capability, needs to be used with AD modules like HX711.

6. Typical range: Mainstream range is 50kg, specifications from 10kg to 200kg are also available, meeting various scenarios for body scales, small desktop scales, etc.

7. High sensitivity and stability: Based on strain gauge principle, high resolution, low creep and hysteresis errors, consistent measurement results after long-term use.

8. Low power consumption: Low working current, suitable for battery-powered portable devices, effectively extending device battery life.

APPLICATION SCENARIOS

1. Household health devices: electronic body scales, smart body fat scales, baby scales, etc.

2. Small weighing devices: mini desktop scales, portable courier scales, smart cabinet weight detection modules.

3. Smart home: smart trash cans, pet feeders, and other devices that require weight sensing.

Product detail

Technical Specifications

ESMTS150A-50KG Human Scale sensor
Rated load	50kg	Operating temperature	-10 ~ 50 ℃
Sensitivity	1.0 ± 0.2mv / v	Zero output	± 1.0mv / v
Zero temperature drift	0.3% FS	Non-linear	0.3% FS
Temperature sensitivity drift	0.3% FS	Lag	0.3% FS
Insulation resistance	≥2000MΩ	Repeatability	0.3% FS
Excitation voltage	3-10vdc	Creep	0.3% FS
Safe overload	120% FS	Input resistance	1000 ± 5% Ω
Output resistance	1000 ± 5% Ω	Comprehensive accuracy	0.3% FS