Beifen Sanpu ZM-102B Intelligent Electronic Soap Film Flowmeter

Overview

The Beifen Sanpu ZM-102B Intelligent Electronic Soap Film Flowmeter is a precision volumetric flow calibration instrument engineered for trace-level gas flow measurement and verification in laboratory, field, and regulatory compliance environments. It operates on the fundamental principle of soap film displacement: a thin, stable soap film is generated across the calibrated bore of a vertical glass tube; the time required for the film to traverse a known reference distance is measured optically using dual infrared sensors. By combining this transit time with the tube’s certified internal cross-sectional area—and applying real-time temperature and pressure compensation—the instrument calculates volumetric flow rate (mL/min) with high reproducibility. Designed specifically for low-to-moderate flow ranges, the ZM-102B covers 1–1000 mL/min, making it ideal for calibrating sampling devices where gravimetric or thermal mass flow methods lack resolution or introduce pressure drop artifacts.

Key Features

• Microprocessor-controlled operation with automatic data acquisition, calculation, and display of volumetric flow, mass flow (via optional gas property input), elapsed time, ambient temperature, barometric pressure, and corrected volume.
• Dual optical sensor system with self-diagnostic capability—simultaneously monitors photodiode output signal strength and allows user-adjustable sensitivity via internal potentiometer calibration.
• Integrated environmental compensation: built-in temperature and pressure sensors enable real-time correction per the ideal gas law, ensuring traceable results compliant with JJG 586–2006.
• High-resolution timing engine: internal clock resolution of 0.01 s (displayed to 0.1 s), supporting sub-second transit measurements critical for low-flow accuracy.
• Portable architecture: all functional modules—including soap film generation chamber, optical path, control electronics, and rechargeable power system—are housed within a compact, ruggedized chassis (90 × 150 × 280 mm, 0.6 kg).
• Intelligent power management: automatic backlight dimming after 10 s of inactivity and full shutdown after 5 min; battery life exceeds 24 h standby on a single 4.8 V / 1800 mAh Li-ion charge (≥500 cycles).
• Flexible power options: operates from internal battery or external 9 V DC source, which simultaneously powers the unit and recharges the battery via regulated float charging circuitry (~3 h full recharge).

Sample Compatibility & Compliance

The ZM-102B is validated for use with non-corrosive, non-condensing gases at ambient temperatures (typically 10–35 °C) and atmospheric pressures (80–106 kPa). It is not intended for liquids, vapors, or reactive/hazardous media. Its design and verification protocol align with China’s national metrological standard JJG 586–2006, which specifies requirements for soap film flowmeter construction, calibration methodology, and maximum permissible error (±1%). While not certified to ISO/IEC 17025 or ASTM D3195, its performance characteristics support GLP-aligned calibration workflows when used within defined environmental limits and with documented operator training. The instrument’s traceable volume calibration, combined with on-board environmental sensing, enables generation of auditable calibration records suitable for internal quality assurance and regulatory review.

Software & Data Management

The ZM-102B operates as a standalone, embedded-system device with no external software dependency. All measurement data—including raw transit time, temperature, pressure, uncorrected and compensated flow values, and timestamp—are displayed in real time on the integrated LCD interface. While it does not feature USB or Bluetooth connectivity, its deterministic measurement sequence and on-screen parameter logging allow direct transcription into laboratory notebooks or LIMS-compatible spreadsheets. For laboratories requiring electronic record retention, manual entry into validated systems (e.g., LabWare LIMS or Empower CDS) satisfies 21 CFR Part 11 requirements when paired with procedural controls for data integrity, audit trail documentation, and user access management.

Applications

• Calibration and verification of personal and stationary air sampling pumps (e.g., OSHA ID-121, NIOSH 0500/0600 methods).
• Field validation of dust and aerosol sampler flow rates prior to and following sample collection campaigns.
• Verification of carrier and auxiliary gas flows in benchtop gas chromatography systems, especially for micro-packed or capillary columns requiring precise low-flow control.
• Recalibration of rotameters and orifice-type flowmeters used in environmental emission monitoring and stack testing setups.
• Performance assessment of portable gas analyzers and electrochemical sensors where flow-dependent response must be characterized.
• Educational use in university analytical chemistry and environmental engineering labs for teaching volumetric flow principles and metrological traceability.

FAQ

What gases can be measured with the ZM-102B?

The instrument is designed for clean, dry, non-reactive gases such as air, nitrogen, oxygen, and helium at ambient conditions. Avoid use with corrosive, condensable, or particulate-laden streams.
Does the ZM-102B require annual recalibration?

Per JJG 586–2006, periodic verification against a primary standard (e.g., piston prover or gravimetric standard) is recommended annually—or before critical measurement campaigns—to maintain metrological confidence.
Can the ZM-102B measure mass flow directly?

No. It reports volumetric flow (mL/min at measured T&P). Mass flow may be derived manually using gas-specific density calculations or entered via optional firmware extensions (not included with base model).
Is the soap solution supplied with the instrument?

A proprietary, low-evaporation, non-foaming surfactant solution is provided with initial shipment. Replacement solutions are available through Beifen Sanpu’s authorized distribution network.
How is temperature and pressure compensation implemented?

Internal digital sensors continuously monitor ambient temperature and absolute pressure. Compensation is applied in real time using the ideal gas law, referenced to standard conditions (25 °C, 101.325 kPa) unless otherwise configured by the user.