Customer Support


Specialty Gas Equipment FAQ


Questions about Switchovers:


Switchover systems are designed to provide a continuous supply of gases to your laboratory, process or instrument.
These systems prevent operational downtime by automatically switching gas supply from the primary cylinder bank to the reserve cylinder bank.


C701 Series

    Semi-automatic switchover for high pressure cylinders
    Manual priority control
    Custom configuration options
    Other Options: Line regulators (recommended), multiple cylinders (manifolds), alarm capability

A208 and A209 Series

    Semi-automatic switchover for high pressure cylinders
    Manual priority control
    Custom configuration options
    Inlet tee-purges or inlet cross-purges respectively to eliminate contamination during cylinder changeout
    Other options: Line regulators (recommended), multiple cylinders (manifolds), alarm capability

539-Intelliswitch I and 538-Intellswitch II

    Best for use with liquid/cryogenic cylinders, due to “look-back” feature
    Fully automatic switchover Electronic display and control
    539 has manual delivery pressure control, 538 has electronic delivery pressure control
    538-Intellswitch II incorporates “web server” capability which allows remote connectivity via internet Other options: multiple cylinders (manifolds), alarm capability


Questions about Regulator Flow Curves:


There are limits to the maximum flow that a regulator can achieve at a specified pressure. This is due to factors such as orifice size, gas path, inlet pressure and outlet pressure, temperature, type of gas, and others. The best way to determine if a regulator will have sufficient flow capacity is to consult their flow charts.

To get started:

You will need to know your approximate flow requirement.
You will need to know your approximate working pressure (delivery pressure), or range of working pressure.
Generally, for calibration applications flow requirements are low. But some applications may require higher flows. (some common units are cfm = cubic feet per minute, scfh = standard cubic feet per hour, lpm = litres per minute, sccm = standard cubic centimeters per minute)

With this information, you can now look at the “Flow Charts” for a given regulator to see if that model will be suitable. Flow curves are usually presented at different inlet pressures, see sample curves below:

Flow Chart
Flowcurve for Messer Baseline C1062 (dual stage) regulator: Flow Chart

They are experimentally determined flow characteristics of a particular regulator.
Note: regulator performance cannot be determined analytically.


The regulators performance is determined by locating your set pressure on the vertical axis and following the appropriate curve to determine potential flow rate and dynamic delivery pressure, often interpolation between two curves is necessary


Questions about the Messer Baseline™ Regulator Series:


There are 5 Baseline™ Regulator models:

    C1061 - single stage, > 3000 psig max inlet
    C1062 - dual stage, < 3000 psig max inlet
    R104 - line regulator, > 3000 psig max inlet
    CH1061 - single stage, 3000 - 4500 psig inlet
    CH1062 - dual stage, 3000 - 4500 psig inlet

Each model has various options to choose, so actual number of unique configurations can number in the thousands.

Messer Baseline™ Regulator

Determine what is the gas type?

    If your gas type is pure gas, the purity should be grade 5.0 (99.999%) or lower
    For gas mixtures we need to know the composition, especially if corrosives are present

For inert, non-corrosive gases Brass is suitable

For corrosive gases, or corrosive components in a gas mixture, Stainless Steel is the first recommendation.

However, for some pure, corrosive gases, ie Hydrogen Chloride, Chlorine, Boron Trichloride, Hydrogen Sulfide, Dichlorosilane there are other models and materials we can offer.

Please contact our Customer Service team by submitting the online Contact Form or calling +1-866-385-5349


Delivery pressure range options for the C1061 or CH1061 series regulator: 0-15, 0-50, 0-100, 0-150, 0-250 psig

Delivery pressure range options for the C1062 or CH1062 series regulator: 0-15, 0-50, 0-100, 0-150, 0-250, 0-500 psig

Delivery pressure range options for the R104 series regulator: 0-15, 0-50, 0-100, 0-150, 0-250. 0-500 psig


Important to check against actual regulator flow curves.


¼ NPT, or compression tube fitting (¼, ⅜, ⅛)


Questions about the Messer Redline™ Regulator Series:


There are 3 Redline™ Regulator models:

    C200/1 - single stage, < 3300 psig max inlet
    C200/2 - dual stage, < 3300 psig max inlet
    R200 - line regulator, < 3300 psig max inlet

Each model has various options to choose, so actual number of unique configurations can number in the thousands.

Messer Redline™ regulator

Determine what is the gas type?

    If your gas type is pure gas, the purity should be grade 5.0 to 6.0 (99.999% to 99.9999%).
    For gas mixtures we need to know the composition, especially if corrosives are present.

For inert, non-corrosive gases Brass is suitable

For corrosive gases, or corrosive components in a gas mixture, Stainless Steel is the first recommendation.

However, for some pure, corrosive gases, ie Hydrogen Chloride, Chlorine, Boron Trichloride, Hydrogen Sulfide, Dichlorosilane there are other models and materials we can offer.

Please contact our Customer Service team by submitting the online Contact Form or calling +1-866-385-5349


Delivery pressure range options for the C200/1 series regulator: 0-50, 0-100, 0-200, 0-725 psig

Delivery pressure range options for the C200/2 series regulator: 0-50, 0-100, 0-150 psig

Delivery pressure range options for the R200 series regulator: 0-50, 0-100, 0-200 psig


Important to check against actual regulator flow curves.


¼ NPT, or compression tube fitting (¼, ⅜, ½)


Questions about Flashback Arrestors:


A flashback arrestor is a special gas safety device. The flashback arrestor stops the flame or reverse flow of gas back up from oxy-fuel welding and cutting into the equipment or supply line. It also prevents the user and equipment from damage or explosives.

Flashback Arrestor 6103A Flashback Arrestor 6103A
Flashback Arrestor 6104 SS Flashback Arrestor 6104 SS

If arrestors were an integral part of the torch, it would require the torch to be taken out of service for routine inspection. External flashback arrestors are much easier to replace even in the field and because they are external to the torch, can have larger component parts for higher flow, and longer service life.


High flow capacity flashback arrestors allow enough gas flow for larger heating and cutting tips. In addition, they have significantly longer service life because of their high flow capacity. A flashback arrestor can limit gas flow if it is too small for the application, causing backfires, short tip life, poor quality work, and even equipment damage.


Brass resettable flashback arrestor (manual reset. Stainless steel flashback arrestor, spring loaded (automatic reset provided the downstream pressure is relieved)

Gases and pressure ratings:

Gas Maximum Operating Pressure
Acetylene 15 psig
Natural Gas 15 psig
Oxygen 150 150 psig
Propane 50 psig
Hydrogen 50 psig

Questions about CGA Cylinder Connections:


In North America, we follow the guidelines of the Compressed Gas Association (CGA) for determining cylinder valve connections. These are commonly referred to as “CGA Cylinder Connections”.

CGA Connections will depend on the gas type or gas concentrations (if it is a mixture), and pressure rating.

The majority of CGA Connections are considered “metal-to-metal”, the seal is created by the metal-to-metal contact of the male and female sides, by the force of the tightening nut. Some CGA Connections, such as CGA320, CAG330, CGA660, CGA679, among others, require the use of a gasket in between the metal contact points. The gasket is generally of Teflon, but can also be lead, or other metal.

It is important to know the cylinder connection when selecting your downstream equipment, such as a regulator, flex hose, manifold, etc.

There is also the Diameter Indexed Safety System (DISS) valve connections. These are primarily used for “electronic gases”, i.e. for the semi-conductor industry. Often the gases are highly toxic and/or reactive.

The CGA Connection type is not a universal standard. Around the world, other countries have their own valve standards so it is important to know that North American equipment may not be compatible in other countries. Some examples include:

    DIN477 in much of central Europe and parts of Asia
    AFNOR in France
    BSP 341 in UK
    AS 2473.2 in Australia and New Zealand


CGA varies with concentration of Oxygen, CGA 580, 5-23% requires CGA 690 >23% requires CGA 296.

*It is recommended that users thoroughly familiarize themselves with the specific properties of these gases.

Gas Type CGA Fittings Required
Acetylene 510/300
Air 590/346/677
Ammonia 240/660/705
Argon 580/677
Arsine* 350
Carbon Dioxide 320
Carbon Monoxide 350
Chlorine 660
Cyclopropane 510
Deuterium 350
Ethane 350
Ethylene 350
Ethylene Oxide 510
Helium 580/677
Hydrogen 350
Hydrogen Chloride 330
Hydrogen Sulfide 330
Krypton, KR-85 580
Methane 350
Methyl Chloride 510
Neon 580
Nitrogen 580/677
Nitrous Oxide 326
Oxygen* 540
Phosphine* 350
Propane 510
Silane* 350
Sulfur Dioxide 668/660
Sulfur Hexaflouride 590
Xenon 580

For more information regarding specialty gas equipment, please contact our Customer Service team by submitting the online Contact Form or calling our Specialty Gas Customer Service team at +1-866-385-5349.