Bronkhorst®
Instruction Manual EL-FLOW® Select9.17.099F 7
1
Introduction
1.1 Scope of this manual
This manual covers the EL-FLOW® Select (including the EL-FLOW® Metal Sealed) series mass flow meters/controllers for
gases. It contains general product information, installation and operating instructions and troubleshooting tips.
1.2 Intended use
The EL-FLOW® Select is designed to accurately measure and/or control gas flow rates in a fluid system using the media and
operating conditions (e.g. temperature, pressure) that were specified at ordering time.
The gas(es) in the pressurized system in which the instrument is mounted must be clean and dry. The equipment is suited
for general purpose indoor (dry) applications, like laboratories and machine enclosures.
EL-FLOW® Select instruments are suitable for use at temperatures conditions between -10 and +70 °C and a relative
humidity of 10 to 90% RH, unless specified otherwise. The instruments have an ingress protection of IP-40, implying that the
electronics housing and electrical connection do not offer any protection against moist environments.
EL-FLOW® Metal Sealed instruments are designed for high purity applications.
The wetted materials incorporated in the EL-FLOW® Select are compatible with media and conditions (e.g. pressure,
temperature) as specified at ordering time. If you are planning to use the product (including any third party components
supplied by Bronkhorst, such as pumps or valves) with other media and/or other conditions, always check the wetted
materials (including seals) for compatibility. See the technical specifications of the product and consult third party
documentation (if applicable) to check the incorporated materials.
Responsibility for the use of the equipment with regard to suitability, intended use, cleaning and corrosion resistance of the
applied materials against the processed media lies solely with the end user.
Where appropriate, this document recommends or prescribes safety measures to be taken with respect to media usage or
working with the described equipment under the specified conditions. The end user is responsible for taking the necessary
safety precautions and proper use of appropriate (personal) protective equipment, even if such is not explicitly
recommended or required in this document.
The end user is considered to be familiar with the necessary safety precautions, and to comply with the appropriate
protective measures as described in the Material Safety Data Sheets of the media to be used in the system (if applicable).
Bronkhorst High-Tech B.V. cannot be held liable for any damage resulting from improper or unsafe use, use for other than
the intended purpose or use with other media and/or under other conditions than specified on the purchase order.
See also section Sealing material compatibility.
1.3 Product description
EL-FLOW® Select series Mass Flow Meters/Controllers are based on the thermal bypass measuring principle. The instruments
are of modular construction with a 'laboratory style' printed circuit board housing. Control valves can either be integrally or
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