Worldwide Shipping and Distribution!

SEMA Gases is originally a Dutch brand of span gases in disposable cylinder cans started from the desire to create a brand which applies to all brands of gas detection equipment. Our products are used for calibration of portable gas detection instruments and calibration of fixed gas detection systems. SEMA Gases produces single gases (flammable gases, oxygen, toxic gases) and gas mixtures (2, 3, 4 or 5 gas mixtures) in various cylinder sizes 10 ltr, 34 ltr, 58 ltr or 110 ltr. SEMA Gases also supplies the corresponding flow regulator valves with different flow rates and thread connections. Manual type flow regulators are used for diffusion-type gas detecting instruments which do not have a pump or with a hand pump. Demand flow regulating valves are used for gas detection instruments with an internal (or external) pump. SEMA Gases also supplies accessories like gas sampling bags, sampling hoses, calibration adapters and carrying cases.

With a growing network of distributors, SEMA Gases will be worldwide available near major ports for shipping and offshore. SEMA Gases is the ultimate brand to check if your gas detection instruments are still in good working condition, which is vital to your safety. Interested as a company to distribute our products? Contact one of our current distributors or us, and discover what SEMA Gases can do for you.


Calibration gas is a reference gas or a mixture of gases which are usually compressed. The composure of calibration gas exists of one initial gas and is enhanced by one or more component(s). Calibration gas is used to calibrate gas analysers or gas detectors. All SEMA calibration gases are traceable according to national (Dutch) as well as international criteria. Calibration gas can be divided into two categories; zero calibration and span calibration.

Zero calibration gas is a gas which is free from flammable gases. Zero calibration gases are performed when gas detection or gas analysers get calibrated with none of the analyte gas structures to which the analyser or detector will respond. For example, a zero calibration of an oxygen-, or carbon dioxide analyser can be performed with pure nitrogen. Because nitrogen does not hold either oxygen or carbon dioxide, a zero point can be confirmed this way.

A span calibration is a more advanced type of calibration gas by which there is a precisely composed concentration of detectable gas exposed towards the gas detector or gas analyser. SEMA Gases delivers multiple types of calibration gases suitable for the shipping industry, offshore industry, chemical industry, laboratories, and universities.

Regulators are used to ensuring you receive the required flow of calibration gas for your application. At SEMA Gases, we only provide a variety quality gas regulators directly available from stock.

At SEMA Gases we have a variety of accessories that make your work much safer. Think of accessories as carrying cases, gas sampling bags, sampling hoses and different types of calibration adaptors. All of our accessories are made of the best quality available and developed by renown brands such as Riken Keiki, Crowcon and SGI.