HengaoDe HAD-2101A4 Portable Static Resistance Strain Gauge with DC Bridge Excitation

Overview

The HengaoDe HAD-2101A4 is a portable, battery-powered static resistance strain gauge engineered for high-precision, field-deployable measurement of micro-strain signals from resistive transducers. It operates on the principle of DC-excited Wheatstone bridge circuitry, delivering stable 2 V DC excitation across bridge resistances ranging from 60 Ω to 1 kΩ. Designed specifically for low-output strain gauges and industrial sensors—such as load cells, displacement transducers, and temperature-compensated stress sensors—the instrument achieves 0.1% full-scale accuracy with sub-microstrain resolution. Its ARM-based embedded architecture, ultra-low-drift linear amplifiers, and auto-zero stabilization enable reliable operation under variable ambient conditions (-15 °C to +45 °C), making it suitable for structural health monitoring, civil engineering QA/QC, geotechnical instrumentation, and manufacturing process validation where portability and metrological traceability are critical.

Key Features

• Four-channel synchronous acquisition with 20 ms full-scan cycle (4 points/20 ms)
• Triple-unit display and calibration: microstrain (με), kilonewtons (kN), and millimeters (mm)—no manual unit conversion required
• Auto-scanning zero balance with ±38,000 με imbalance tolerance and <±3 με/4 h zero drift
• Configurable bridge configurations: 1/4-bridge, half-bridge, and full-bridge modes
• Strain gauge factor (GF) programmable from 0.01 to 9.99; sensor sensitivity configurable from 1000–9999 με/FS
• Integrated lithium-ion battery (7.4 V DC) enabling ~8 hours of continuous operation without external power
• Robust aluminum alloy shielded enclosure (116 × 200 × 36 mm, 1.5 kg) with IP-rated connectors and aviation-grade terminals
• Onboard data storage: 100 pages (4 channels/page); peak-hold, replay, and real-time logging functions

Sample Compatibility & Compliance

The HAD-2101A4 interfaces directly with standard foil-type strain gauges (350 Ω, 120 Ω, or custom resistance) and industrial bridge-output sensors compliant with IEC 60794 (optical fiber cable testing), ASTM E251 (metallic foil strain gauges), and ISO 17025-accredited calibration workflows. Its input impedance exceeds 10¹² Ω, minimizing loading effects on high-impedance sensors. The device supports traceable calibration via NIST-traceable reference standards (included in optional calibration kits). While not certified to ATEX or IECEx, its low-power design and non-incendive signal conditioning meet general-purpose industrial safety requirements per UL 61010-1 and CE EN 61326-1 for EMC and electrical safety. Operating humidity range (≤85% RH, non-condensing) ensures stability during outdoor structural inspections and construction site deployments.

Software & Data Management

The HAD-2101A4 communicates via USB 2.0 to Windows-based PC software supporting GLP-compliant data acquisition and reporting. The application provides time-series (T-Y) and parametric (X-Y) plotting, bar graph visualization, and rosette strain analysis for biaxial stress evaluation. All acquired datasets include timestamp, channel ID, unit metadata, and environmental context (temperature, battery level). Audit trails record user actions, parameter changes, and calibration events—supporting FDA 21 CFR Part 11 compliance when deployed in regulated environments. Data export formats include CSV, Excel (.xlsx), and PDF reports with embedded instrument ID, firmware version, and measurement uncertainty estimates. Firmware updates are delivered via signed binary packages with checksum verification.

Applications

• Bridge deflection and pile load testing in civil infrastructure projects
• In-situ verification of bolt preload and flange stress in pressure vessel maintenance
• Dynamic strain mapping on wind turbine blades during commissioning trials
• Calibration and functional testing of force transducers per ISO 376
• Material fatigue characterization in university mechanics laboratories
• Non-destructive evaluation (NDE) support for weld integrity assessment using strain-based residual stress analysis

FAQ

What bridge excitation voltage does the HAD-2101A4 provide?

It supplies a regulated 2 V DC excitation across all supported bridge configurations.

Can the instrument measure strain without external software?

Yes—it operates autonomously with local LED display, onboard memory, and real-time peak-hold functionality.

Is temperature compensation built into the hardware?

Zero drift is compensated to ±1 με/°C; users may apply additional thermal correction coefficients via software.

Does it support ASTM E1238 or ISO 10545-13 strain measurement protocols?

Its resolution (1 με), linearity (±0.02% FS), and repeatability meet the metrological requirements specified in those standards.

How is calibration traceability maintained?

Calibration certificates are issued against NIST-traceable shunt resistors; annual recalibration is recommended per ISO/IEC 17025 guidelines.