STW31 Miniature Load Cell Force Sensor

The STW31 Miniature Load Cell is a high-precision, compact, and fast-response force sensor designed for applications where space is limited but measurement accuracy is critical. It covers a measuring range from 0–3 kg up to 0–50 kg, with customizable options available. It is widely used in key feel testing machines, hot and cold pressing equipment, film inspection systems, robotic gripping force measurement, and medical devices. The sensor offers flexible output options including standard mV/V signal, 4–20mA, 0–10V, 0–5V, 1–5V, 0.5–4.5V, as well as industrial communication protocols such as Modbus-485 RTU and CANopen, ensuring strong system compatibility. Built with alloy steel or stainless steel housing, it provides excellent durability and anti-interference performance. With an overall accuracy of ±0.5% F.S, low temperature drift, and stable long-term output, the STW31 is an ideal solution for precision force measurement and smart device integration.

1. Key Features

Low temperature drift with excellent long-term stability
Miniature structure design for space-limited installation
High stability and strong anti-interference capability
Various output signal options available

2. Technical Specifications

General Electrical Data

Measurement Range	0–3 kg, 0–50 kg (customizable within 0–3 to 50 kg full range)
Sensitivity	1.0–2.0 mV/V
Bridge Excitation Voltage	5–12VDC(Recommended: 10 VDC)
Output Signal	mV/V (default), 4–20mA, 0–5V, 1–5V, 0–10V, 0.5–4.5V, RS485 Modbus RTU, CANopen, PNP, NPN

Performance Specifications

Comprehensive Accuracy	0.5%F.S.(including non-linearity, hysteresis, and repeatability)
Creep	±0.3%F.S/30 min
Zero Balance	±1%F.S
Zero Temperature Effect	±0.05% F.S / 10℃
Sensitivity Temperature Drift	≤±0.05%F.S / 10°C
Overload pressure	120% F.S.
Operating Temperature Range	-20°C to +65°C

3. Applications

Industrial Automation Equipment
Robotic force control systems
Keyboard button feel testing equipment
Hot and cold pressing and material testing equipment
Film inspection and micro force measurement systems
Other industrial applications

4. Selection Guide

Pressure Sensor Selection Key Points: Confirm the measuring range, match the output signal, ensure media compatibility, select the appropriate mounting interface, and define the accuracy requirements.

5. FAQ (Frequently Asked Questions)

Q1: What are the installation environment requirements for the STW31 Miniature Load Cell Force Sensor?

The STW31 is built with alloy steel or stainless steel housing and offers strong environmental adaptability. It operates reliably in industrial environments from -20°C to +65°C, but overload and strong impact should be avoided to ensure accuracy and service life.

Q2: Can the STW31 Miniature Load Cell Force Sensor be customized in range or output?

Yes, the STW31 supports customizable ranges from 0–3 kg to 0–50 kg, and output signals and interfaces can also be tailored according to system requirements for different automation integrations.

Q3: What is the accuracy of the STW31 Miniature Load Cell Force Sensor? Is it suitable for high-precision measurement?

The STW31 offers an overall accuracy of up to ±0.5% F.S., with good linearity, repeatability, and anti-interference performance. It also features low temperature drift, making it suitable for high-precision force measurement applications.

Q4: What output signal types does the STW31 Miniature Load Cell Force Sensor support?

The STW31 supports multiple output options including standard mV/V signal, 4–20mA, 0–10V, 0–5V, 1–5V, 0.5–4.5V, as well as industrial communication protocols such as Modbus-485 RTU, CANopen, and switching outputs like PNP/NPN.

Q5: What industrial applications is the STW31 Miniature Load Cell Force Sensor suitable for?

The STW31 Miniature Load Cell Force Sensor is widely used in key feel testing machines, hot and cold pressing systems, film inspection equipment, robotic gripping force measurement, and medical device force testing applications requiring high-precision micro force measurement.

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