GMS Instruments BV

GMS Instruments fotoWith GMS Instruments, everything is under control!

To measure is to know. But knowing is more than measuring. As a professional you need to have all your technology firmly under control. You cannot work efficiently without accurate measuring, regulating and control equipment. Without a strong partner in assembly, repair and calibration you lose that control.


B. de Haan
Driemanssteeweg 190
F +31 (0) 10 293 88 77

With the head office based in Rotterdam, GMS Instruments for over 35 years has been the leading importer, wholesaler and service provider of measuring, control, and calibrating equipment. GMS has customers throughout the shipping, (petro)chemical and offshore industries. Your success can be measured by our wide range, our know-how and our total service package. Your results are measurably better if you make use of the product knowledge of the specialists at GMS Instruments. Your deadlines will no longer be at risk if you rely on the 24 hour sales and service support of GMS Instruments. We don’t like to say no. And you can always count on GMS Instruments as the exclusive dealer of scores of renowned brands and stock of more than 30,000 products. With GMS Instruments you have everything under control.

In February 2010 GMS Instruments expanded its company by the foundation of GMS Instruments Belgium. The new office and workshop are located in Antwerp, the second largest petrochemical site in the world, in the heart of the harbour and petrochemical sites. This offers our customers full service and flexibility for pressure and temperature measuring instruments.

SEMA Gases

The most recent development at GMS Instruments is SEMA Gases. SEMA Gases is a new to the market gas detection brand endorsed by GMS Instruments. With SEMA Gases, GMS Instruments has separate its gas detection department in an own business model.

SEMA Gases is a new brand of span gases in disposable cylinder cans started from the desire to create a brand which is applicable for all brands of gas detection equipment. SEMA Gases 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. Visit SEMA Gases at