Electrode Body Fat Analyzer

This device measures body composition using multi‑frequency bioelectrical impedance analysis (BIA). A low‑amplitude alternating current is passed through the body via surface electrodes, and the resulting impedance is analyzed to estimate fat mass, lean mass, and total body water.

Key Technical Specifications

Electrode Design and Materials

The analyzer uses eight disposable electrode pads, each consisting of a 316L stainless steel substrate coated with a silver/silver chloride (Ag/AgCl) layer. This combination provides stable half‑cell potential and low polarization impedance across the measurement spectrum.

A thin hydrogel layer (typically 0.2 mm thick) ensures consistent skin contact while minimizing motion artifacts. The hydrogel formulation is isotonic and free of latex, reducing the risk of skin irritation for repeated use.

Electrode geometry is optimized for a contact area of 1.2 cm², which balances current density safety (<0.1 mA/cm²) with sufficient signal‑to‑noise ratio for segmental measurements.

Measurement Sites and Configuration

The device supports three primary configurations: hand‑to‑hand, foot‑to‑foot, and segmental (hand‑to‑foot). In the hand‑to‑hand mode, electrodes are placed on the thenar eminence of each hand, providing a quick estimate of total body impedance.

Foot‑to‑foot placement uses the plantar surface of each foot, advantageous when upper‑body movement is restricted. Segmental mode requires four electrodes on the hands and four on the feet, enabling separate impedance readings for the arms, trunk, and legs.

Switching between configurations is performed via software selection; the hardware remains unchanged, reducing setup time and minimizing user error.

Environmental and Operational Limits

The analyzer is designed for indoor use in controlled environments such as clinics, fitness centers, and wellness studios. It operates reliably within a temperature range of 0 °C to 45 °C and relative humidity up to 85 % non‑condensing.

Ingress protection is rated IP20; the unit should be kept away from direct liquid exposure. Electrodes are single‑use and should be stored in a sealed pouch at 5 °C–25 °C to preserve hydrogel integrity.

Battery management includes over‑charge and over‑discharge protection, providing approximately 8 hours of continuous operation on a full charge.

Data Output and Interface

Measurement results are processed by a 32‑bit ARM Cortex‑M4 MCU and displayed on a 1.54‑inch LCD (240×240 pixels) with touch capability. The device outputs the following parameters: body fat percentage, fat mass (kg), fat‑free mass (kg), total body water (L), basal metabolic rate (kcal/day), and segmental lean distribution.

Data can be exported via Bluetooth Low Energy (BLE 5.0) to a companion mobile app or through a USB‑C port for direct PC connection. The exported file format is CSV with timestamps and raw impedance values for each frequency.

Optional API access is available for OEM integration, allowing real‑time streaming of impedance data at up to 10 Hz.

Customization Options

• Electrode size and shape (custom die‑cut for specific anatomical sites)
• Hydrogel formulation (adjusted conductivity, antimicrobial additives)
• Housing material (ABS, polycarbonate, or over‑molded TPU for grip)
• Display options (monochrome LCD, OLED, or external smartphone‑only mode)
• Communication modules (BLE, ANT+, NFC, or wired RS‑232)

All customizations are subject to minimum order quantities and tooling lead times, which are provided upon request.

Quality Control and Testing

Each production lot undergoes impedance verification using a precision resistor network traceable to national standards. The verification ensures that the measured impedance at 50 kHz is within ±0.2 % of the reference value.

Electrode adhesion is tested per ASTM D3330, with a minimum peel strength of 0.15 N/cm after 24 h at 23 °C/50 % RH. Hydrogel moisture loss is monitored gravimetrically, targeting <5 % weight loss over 30 days storage.

Final functional testing includes a full BIA sweep on a reference phantom (saline‑filled torso simulator) to confirm accuracy of fat mass estimation across the operational temperature range.

Applications and Industry Fit

In fitness facilities, the analyzer provides trainers with repeatable segmental data to tailor resistance programs and monitor muscle‑fat changes over weeks. The short measurement time (<30 seconds) allows integration into circuit‑training workflows without significant downtime.

Clinical settings such as bariatric clinics and dialysis centers use the device to track fluid shifts and lean mass preservation, where the multi‑frequency approach improves extracellular‑intracellular water differentiation compared to single‑frequency units.

Wellness programs in corporate environments benefit from the portable form factor and Bluetooth sync, enabling employees to log measurements via a personal app and aggregate data for population health reporting.

The combination of low power consumption, quick setup, and reliable electrode performance reduces the total cost of ownership compared with larger, cartridge‑based BIA systems.

Frequently Asked Questions

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