MNK MDL200 Portable Gas Dilution System
| Brand | MNK |
|---|---|
| Origin | Beijing, China |
| Model | MDL200 |
| Dilution Ratio Range | 2–100× |
| Output Flow Rate | 1–5 L/min |
| Dilution Mode | Binary (Two-Gas) |
| Flow Control Technology | Thermal Mass Flow Control |
| Flow Accuracy | ±0.5% of reading |
| Repeatability | <0.2% RSD |
| Linearity (R²) | >0.9999 |
| Overall Dilution Uncertainty | <1% |
| Compliance | ISO 6145 |
Overview
The MNK MDL200 Portable Gas Dilution System is an engineered solution for precise, on-site generation of trace-level calibration gas standards via binary dynamic dilution. Based on the principle of thermal mass flow control—where gas molecules transfer heat from a heated sensor element at a rate proportional to their mass flow—the MDL200 delivers stable, gravimetrically traceable dilutions without reliance on pressure or temperature compensation algorithms. Designed in strict accordance with ISO 6145-1:2015 (Gas analysis — Preparation of calibration gas mixtures — Part 1: Gravimetric method) and validated against reference measurements traceable to the National Institute of Metrology (NIM), China, the system enables certified dilution performance across environmental monitoring, emissions testing, and analytical instrument calibration workflows. Its compact, battery-compatible chassis supports field deployment in mobile labs, stack testing environments, and regulatory audit scenarios where portability and metrological integrity are co-required.
Key Features
- Thermal mass flow controllers (MFCs) sourced from internationally qualified suppliers, factory-calibrated against NIM-traceable primary standards
- Dual-channel architecture supporting independent, synchronized control of carrier and analyte gas streams for true binary dilution
- Real-time flow monitoring with digital display of both upstream and diluted stream flow rates (1–5 L/min range)
- Integrated thermal stabilization circuitry minimizing ambient temperature-induced drift (<0.05% / °C)
- Non-reactive stainless-steel wetted path compliant with ISO 8573-1 Class 2 purity requirements for compressed gases
- Self-diagnostics routine verifying MFC zero stability, linearity, and cross-sensitivity prior to each dilution sequence
Sample Compatibility & Compliance
The MDL200 is compatible with non-corrosive, non-condensing gases including N₂, O₂, CO₂, CH₄, NO, SO₂, and VOCs in air or nitrogen matrices. It is not intended for use with halogenated compounds, hydrogen sulfide, or gases exceeding 100 ppm H₂O dew point. All dilution operations comply with ISO 6145-7:2021 (Dynamic volumetric methods) and support GLP/GMP-aligned documentation when paired with external data loggers. The system’s uncertainty budget—validated per ISO/IEC 17025:2017 Annex A.4—accounts for MFC accuracy (±0.5%), repeatability (0.9999), and mixing chamber residence time effects, resulting in total dilution uncertainty <1% (k=2). Certificate of Conformance includes NIM reference calibration data and ISO 6145 traceability statement.
Software & Data Management
While the MDL200 operates as a standalone hardware platform with front-panel controls, optional RS-485 and analog 4–20 mA outputs enable integration into SCADA or LIMS environments. When connected to MNK’s companion PC software (v3.2+), users can configure dilution sequences, export timestamped flow logs (CSV), generate audit-ready reports compliant with FDA 21 CFR Part 11 (electronic signatures, audit trails, and user access levels), and perform post-hoc uncertainty propagation analysis using built-in Monte Carlo simulation modules. All calibration records—including MFC recalibration dates, reference standard IDs, and technician signatures—are stored locally with SHA-256 hashing for integrity verification.
Applications
- Field calibration of CEMS (Continuous Emission Monitoring Systems) and portable FID/NDIR analyzers
- Preparation of EPA Method 205-compliant permeation tube challenge gases
- Verification of ozone monitor response linearity per ISO 14644-3
- Generation of low-concentration reference standards for GC-FID, GC-MS, and FTIR spectroscopy
- On-site validation of air quality sensor networks under EN 14625:2022
- Supporting ISO 17025 accredited laboratories in maintaining measurement traceability for gas analysis
FAQ
What gas standards can the MDL200 generate?
It produces binary dilutions of target analytes in inert carrier gases (e.g., N₂, synthetic air) at ratios from 2× to 100×, suitable for concentrations ranging from ppm to low % v/v.
Is third-party certification available?
Yes—NIM (National Institute of Metrology, China) issues a Certificate of Calibration annually; optional UKAS-accredited verification is available through authorized MNK service partners.
Can the MDL200 be used in explosive atmospheres?
No—it lacks ATEX or IECEx certification and must be operated only in non-hazardous locations per IEC 60079-0.
How often does the system require recalibration?
Annual recalibration is recommended; however, built-in zero-check routines and flow stability monitoring allow extension to 18 months under documented controlled-use conditions per ISO/IEC 17025 Clause 6.5.
Does it support multi-gas dilution beyond binary mode?
Not natively—the MDL200 implements two-channel thermal MFC control optimized for high-accuracy binary dilution; tertiary dilution requires cascaded MDL200 units or integration with MNK’s MDL400 series.
