EE-25 Intelligent Dry Gas Flowmeter (Calibration Standard)

Overview

The EE-25 Intelligent Dry Gas Flowmeter is a primary-standard, positive displacement flow calibration instrument engineered for high-accuracy volumetric flow measurement of clean, dry gases at ambient conditions. Utilizing a precision-machined rotary piston mechanism, the EE-25 operates on the principle of mechanical displacement—where each rotation of the calibrated piston corresponds to a fixed, traceable volume of gas. This fundamental design ensures intrinsic metrological stability, minimal drift, and long-term repeatability without reliance on flow profile or gas property compensation. As a Class 1 reference standard (per ISO 4064-2:2014 and Chinese national verification regulation JJG 577–2012), the EE-25 is specifically validated for calibrating low-flow gas sampling devices—including personal air samplers, environmental monitoring pumps, and laboratory-grade gas analyzers—in regulatory and quality-controlled environments.

Key Features

• Positive displacement measurement architecture with ceramic-coated rotary pistons for wear resistance and thermal stability
• Full-scale flow range of 5–2010 mL/min, covering critical calibration points for OSHA, NIOSH, and EPA-compliant sampling protocols (e.g., 10–2000 mL/min for sorbent tube and filter-based collection)
• Integrated temperature and pressure sensors (±0.2 °C, ±0.5 kPa) enabling real-time volumetric correction to standard conditions (25 °C, 101.325 kPa)
• Multi-interface connectivity: RS-232, RS-485, USB-C, and 10/100 Mbps Ethernet for seamless integration into automated calibration workflows
• Onboard non-volatile memory storing ≥10,000 calibration events with timestamp, operator ID, and environmental metadata
• Modular mechanical design compliant with IP54 ingress protection; operational weight <2.8 kg and footprint <180 × 150 × 120 mm for field-deployable use

Sample Compatibility & Compliance

The EE-25 is designed exclusively for clean, dry, non-corrosive gases (e.g., air, nitrogen, helium, synthetic air) with dew point ≤ −20 °C and particulate content <0.3 µm. It is not rated for saturated, humid, or chemically aggressive streams. The device meets metrological requirements for secondary standard calibration in accordance with ISO/IEC 17025-accredited laboratories. Its traceability chain is maintained through NIM (National Institute of Metrology, China)-certified calibration certificates, with uncertainty budgets reported per GUM (JCGM 100:2008). For regulatory applications, the EE-25 supports compliance with EPA Method TO-11A (for VOC sampling pump calibration), ISO 12039 (ambient air quality—determination of benzene), and EN 13649 (workplace exposure—pump performance verification).

Software & Data Management

The EE-25 operates with AMAE-DESK Calibration Suite—a Windows-based desktop application supporting fully automated, script-driven calibration sequences. The software implements bidirectional communication with connected sampling pumps and load simulators (e.g., AMAE-LOAD-100), enabling closed-loop flow setpoint control and dynamic error mapping. All calibration sessions generate tamper-evident PDF reports compliant with GLP and ISO 17025 documentation requirements—including raw data export in CSV/Excel format, digital signature fields, and audit trail logging per FDA 21 CFR Part 11 Annex 11 principles. Data synchronization to cloud-based LIMS or internal QA platforms is supported via HTTPS RESTful API or OPC UA protocol.

Applications

• Periodic verification and recalibration of personal and area air sampling pumps used in industrial hygiene and occupational health programs
• Factory acceptance testing (FAT) and routine performance checks of gas chromatography sample introduction systems
• Validation of flow controllers in environmental emission monitoring systems (CEMS) per EN 15267
• Research-grade flow characterization in microfluidic sensor development and gas sensor response modeling
• Supporting ISO 9001 and ISO 14001 internal audit requirements for measurement process control

FAQ

What gas species are compatible with the EE-25?
Clean, dry, non-reactive gases only—including ambient air, nitrogen, argon, helium, and synthetic air. Avoid use with moisture-saturated, acidic, solvent-laden, or particulate-laden streams.
Does the EE-25 require periodic recalibration?
Yes. Recommended recalibration interval is 12 months or after 500 operational hours—whichever occurs first—to maintain Class 1 accuracy and traceability. Certificate includes as-found/as-left data and expanded uncertainty (k=2).
Can the EE-25 be used for in-line calibration without interrupting the sampling system?
No. As a primary standard, it operates in series configuration and requires temporary disconnection of the device under test. Parallel bypass configurations are not supported due to inherent pressure drop sensitivity in positive displacement designs.
Is AMAE-DESK compatible with third-party LIMS or ELN systems?
Yes. AMAE-DESK provides configurable CSV templates and a documented REST API for integration with major LIMS vendors (e.g., LabWare, STARLIMS, Thermo Fisher SampleManager) and electronic lab notebooks.
What is the maximum allowable backpressure during operation?
≤10 kPa differential pressure across the inlet and outlet ports. Exceeding this may affect piston sealing integrity and volumetric fidelity.