Introduction
Bronkhorst High-Tech B.V. is a leading European provider of thermal Mass Flow Meters/Controllers and Electronic Pressure Controllers, offering customized solutions for various applications across different markets, including laboratory, industrial, hazardous areas, semiconductor, and analytical installations.

EX-FLOW Series for Hazardous Areas
The EX-FLOW series is designed for gas flow applications in hazardous environments. These meters are IECEx and ATEX certified for use in Zone 1 or EPL Gb flammable gas atmospheres, with an ambient temperature up to +70°C. They are marked II 2 G Ex ib IIC T4 Gb and have certifications from EU ATEX, IECEx, JP TIIS, and KOR KCs.

Mass Flow Controllers
The EX-FLOW Mass Flow Controllers (MFC) can include an integral or separate control valve, which is a proportional, electromagnetic valve with fast control characteristics. Different series of control valves are available, including standard direct acting, pilot operated for high flow rates, and Vary-P valves for high-pressure applications. Valves are equipped with explosion-protected certified coils, available in two types: XB (intrinsically safe) and XC (increased safety).

Power Supply and Readout
EX-FLOW MFM or MFC units should be connected to an E-8000 Series power supply/readout system, which provides certified intrinsically safe galvanic isolation inputs and outputs. This system must be installed in a safe area.

General EX-FLOW Features
Typical Ex-system rating is ATEX Equipment Category 2, Zone 1 (Gas) or IECEx EPL Gb. Flow ranges from 0.16…8 mln/min up to 220…11000 m3n/h, with pressure ratings up to 700 bar. Applications include process gas measurement, fuel cell technology, gas distribution, hydrogenation, gas consumption measurement, and biogas production.

Technical Specifications
Accuracy is ±1% FS, with a turndown ratio of 1:50. Repeatability is < ±0.2% Rd, and the time constant is 5 seconds. Operating temperature ranges for the EX-FLOW sensor and coils are specified, with temperature sensitivity and leak integrity details provided. Mechanical parts are made from stainless steel 316L or comparable materials, with various process connections and seal options available. Electrical properties include output signals and coil voltage specifications.

Models and Flow Ranges
Various models of Mass Flow Meters and Controllers are available, with specific flow ranges and pressure ratings. High-flow and high-pressure models are also detailed, with contact information for custom requirements.

Conclusion
Bronkhorst High-Tech offers a wide range of innovative instruments for low-flow measurement and control, supported by a global sales and service network in over 40 countries.