EE-35 Intelligent Dry Gas Flowmeter (Calibration Standard)

Overview

The EE-35 Intelligent Dry Gas Flowmeter is a primary standard-grade positive displacement flowmeter engineered for high-accuracy calibration and verification of low-to-medium flow rate gas sampling instruments. Operating on the rotary piston principle, it delivers traceable volumetric flow measurement without reliance on gas composition, temperature, or pressure compensation—making it inherently stable and highly reproducible across ambient laboratory and field-deployable environments. Designed to meet Class 1 accuracy requirements per ISO 4064-2:2014 and Chinese national metrological regulation JJG 577-2012, the EE-35 serves as a reference standard in accredited calibration laboratories, environmental monitoring centers, and occupational health & safety QA/QC units. Its compact footprint (220 × 160 × 140 mm) and lightweight construction (≤3.2 kg) enable seamless integration into mobile calibration carts or benchtop verification workstations.

Key Features

• Positive displacement rotary piston mechanism ensures direct volumetric measurement with minimal drift and zero dependency on gas density or viscosity
• Calibrated flow range of 1–35 L/min at standard conditions (25 °C, 101.325 kPa), covering common sampling rates for respirable dust cyclones, sorbent tube analyzers, and passive badge calibrators
• Integrated digital transducer with 0.01 L/min resolution and ±0.5% reading uncertainty (k = 2) over full scale
• RS-485 Modbus RTU and USB-C interfaces support bidirectional communication with host PCs, load simulators, and programmable flow controllers
• Embedded real-time clock and non-volatile memory store up to 10,000 calibration events with timestamp, operator ID, and environmental metadata (T/P)
• Front-panel OLED display with dual-unit readout (L/min and m³/h), status indicators, and guided menu navigation

Sample Compatibility & Compliance

The EE-35 is validated for use with dry, non-corrosive, particle-free gases including air, nitrogen, carbon dioxide, and synthetic air mixtures. It is not rated for saturated, humid, or chemically aggressive streams (e.g., H₂S, Cl₂, or solvent vapors). The device conforms to mechanical and electrical safety requirements under GB 4793.1–2018 (equivalent to IEC 61010-1). Calibration certificates issued with each unit are traceable to NIM (National Institute of Metrology, China) through accredited secondary standards. For regulatory compliance, the EE-35 supports GLP-aligned workflows per ISO/IEC 17025:2017 clause 7.7 and provides audit-ready records compatible with FDA 21 CFR Part 11 when used with AMAE-DESK software configured with electronic signatures and change control logs.

Software & Data Management

The EE-35 operates natively within the AMAE-DESK Calibration Management Platform—a Windows-based application designed for automated flow instrument verification. AMAE-DESK executes pre-defined calibration protocols (e.g., multi-point linearity checks, repeatability tests, zero-drift assessments), synchronizes data from connected load simulators and DUTs (Device Under Test), and generates compliant reports in PDF and CSV formats. All raw measurements include embedded metadata: ambient temperature/pressure, calibration gas type, operator credentials, and uncertainty budgets calculated per GUM (JCGM 100:2008). Data export supports secure HTTPS upload to enterprise LIMS or cloud-hosted QA portals. Firmware updates and configuration backups are performed via encrypted USB-C session.

Applications

• Periodic verification of personal and area air sampling pumps used in industrial hygiene (per OSHA ID-255, NIOSH 0500/0600)
• Calibration of low-flow gas chromatography sample injectors and permeation tube ovens
• Validation of stack gas dilution systems prior to EPA Method 30B mercury testing
• Performance auditing of portable VOC analyzers and photoionization detectors (PIDs)
• Teaching and demonstration of volumetric flow metrology principles in university analytical instrumentation labs

FAQ

Is the EE-35 suitable for calibrating wet-gas or high-humidity sampling systems?
No. The EE-35 is specified for dry, non-condensing gas streams only. For humidified flows, a heated laminar flow element or gravimetric reference system is recommended.
Does the EE-35 require periodic recalibration by an external lab?
Yes. Annual recalibration against a national metrology institute (NMI)-traceable standard is required to maintain Class 1 certification. Internal verification using built-in zero-check and span-check routines is advised before each daily use.
Can AMAE-DESK generate reports compliant with ISO/IEC 17025 accreditation?
Yes. When deployed with controlled user access, versioned procedures, and enabled audit trail logging, AMAE-DESK meets documentation requirements for Clause 7.8.2 and Annex A.3 of ISO/IEC 17025:2017.
What environmental conditions affect EE-35 measurement stability?
Ambient temperature fluctuations > ±2 °C/h or barometric pressure changes > 0.5 kPa/min may introduce minor transient errors. Operation within 15–30 °C and 86–106 kPa is optimal.
Is firmware update capability available over-the-air (OTA)?
No. Firmware updates require local connection via USB-C and authenticated access to AMAE’s secure engineering portal. No remote or network-based update functionality is implemented for cybersecurity compliance.