+31 (0) 33-2300039 contact@degrootinstruments.nl


Founded in 1998, FITOK Group in an industry-leading developer and manufacturer of superior high-quality instrumentation valves and fittings . FITOK Group has R&D centers, manufacturing facilities and warehousing and service locations in Offenbach, Germany; Stafford, TX, USA and Shenzhen, China.

FITOK Group has five production categories, including: General Instrument Valves and Fittings, High Pressure Valves and Fittings, Semiconductor, Gas Valves and Fittings, Closed loop Sampling Systems and Process Valves and Fittings.

Classic Filters

Classic Filters – the gas and liquid filter-system specialist

From a filter element, to a filter housing, to a complete filter system for almost any function, they deliver some of the most robust, high-quality, coalescing and particulate filters in the world.

Whatever material, whatever application. They make filters according to your specific needs, and they’re proud of what they do.


E.I.F. ASTUTE is an excellent platform for the next generation of sensors and analyzers being developed for the ISA/ANSI SP76 specification. It allows for different sample streams, regulation of physical characteristics of the sample and sample filtration all in one system. Benefits: Reliability; Minimized response time; Minimal maintenance; Reduction in the amount of sample sent to vent; Minimized congestion for a maximized accessibility; Complete modularity; Open system design with the ability to adapt to future needs; Economies of scale; Reduction in the consumption of utilities

Shelco Filters

Superior Solution and Satisfaction
Since 1973, Shelco has used state-of-the-art research and development to design high-quality filters that increase performance and reduce costs. As the leading industrial filter manufacturer, our proven single shell design – made in the USA – has become an industry standard; and today, our entire product line offers innovative solutions for each customer. Our best-sellers include:

MicroGuardian Industrial Filter Housing
MicroSentry™ Industrial Filter Cartridges
MicroVantage™ High Purity and Sanitary Filter Housings
MicroVantage™ High Efficiency and Membrane Filter Cartridges
MicroSentry™ Bag Filter Housings and Filter Bags

We take pride in the fact that Shelco Filter Cartridges are distributed and used the world over in a wide range of high-purity applications.


Founded in 1983, Sensidyne was established as a manufacturer and distributor of gas detection and air sampling instrumentation and a major supplier of gas detection tubes.
Sensidyne provides products to a broad range of process, manufacturing and infrastructure industries including Power, Chemical, Oil and Gas, Mining, Industrial Gases, Semi-conductor, Metals, Water and Waste Treatment facilities worldwide.
The core competencies lie in product development, manufacturing, distribution and service of fixed gas detection, brands include SensAlert® Fixed Point Gas Detectors.
Sensidyne is dedicated to providing the highest reliability, latest technology, expert customer service, and technical support.  We also provide detailed technical information and assistance for a wide variety of applications across our entire product offering. Sensidyne is an ISO 9001:2008 Certified organization.


Senko Co., Ltd has developed sensors of the carbon monoxide, hydrogen sulfide by their own technology, starting with the oxygen sensor.
They also developed to produce gas safety equipment and its systems such as the portable gas detector in the industrial field.
They will take every possible efforts to work together with their customers, to develop the best possible products.
They are focused to develop the more efficient, convenient products for the customers, using the new technology as well as the conventional gas safety equipment.

Pressure Tech

Extensive range of high quality stainless steel pressure regulators for use on gas and liquid applications. Our ability to work closely with our customers and listen to their specific needs, has helped ensure we design products that provide accurate control to their systems, with long term reliability in service. Pressure Tech regulators are manufactured within the UK and covered by ISO-9001 accreditation.


UHP & Industrial Pressure Reducing Regulators for corrosive liquid & gas control. Panel and Gas bottle regulators.

DRASTAR is specialized in UHP Pressure Reducing Regulator for Semi-Conductor Product Line, corrosive liquid & gas control, high-flow liquid & gas regulators.


iPolymer (“IPS”) (including TEQCOM Industries and BECO Manufacturing), are specialized in providing high-purity engineered flow control solutions to the global market.  They manufacture high-purity plastic fluid handling and actuation devices for industries and applications requiring engineered performance using PTFE, PFA, PVDF, PEEK, Polypropylene, PVC and other specialized polymers. These products are ideal for use in semiconductor, bio-medical, pharmaceutical, food and sanitary process, high-purity laboratory, and other general chemical handling environments.

King Instrument Company

King Instrument Company manufactures 95% of the 6000 meter components used in our products. These include the borosilicate glass metering tubes we call Kinglass.
They operate an in-house calibration lab and perform NIST traceable calibrations (conform to ISA RP 16.6).
The King product line has grown and expanded to satisfy the demands of almost any variable area flowmeter application.

Nearly all their products were designed in response to customer need with their own exceptional quality and distinctive style.


ARMATURENBAU and MANOTHERM, leverancier van manometers, scheidings membranen, thermometers, limiet schakelaar contact assemblages voor manometers en thermometers, druk transmitters, dead weight testers sinds 1903. Naast de productie van onze standaard producten van kwaliteit volgens DIN/EN raadplegen wij ook onze klanten in alle aangelegenheden betreffende druk en temperatuur. We ontwikkelen tal van op maat gemaakte producten speciaal voor onze klanten.

Winters Instruments

Since 1953, Winters Instruments has been providing quality built instrumentation to all markets that require pressure and temperature measurement. The company is a leading, global manufacturer of industrial instrumentation.

Their comprehensive product lines of pressure gauges, thermometers, diaphragm seals, transmitters, switches and accessories are brought to market by an extensive network of distribution partners


DEKORON®/UNITHERM’s Heat Control products are an efficient, low cost method for installing heat traced instrument lines. They are engineered to meet the design and operating specifications of the refining, petrochemical, chemical, power, and associated industries.
DEKORON®/UNITHERM’s Heat Control product line consists of:
• Pre-Insulated Tubing
• Pre-Insulated Steam Traced Tubing
• Pre-Insulated Electric Traced Tubing
• Flexible Heated Hoses
• Continuous Emissions Monitoring Industry

SMB Gesellschaft

Your Partner for all Automation-, instrumentation-, and Process analyzer systems.

Supply of Mounting Equipment; Special Equipment; Electrical Tracing; Restore (used machinery); Wide Range of Maintenance Programs.

BULK srl instrument

BULK srl instrument designs and manufactures compression type double ferrule fittings, needle valves and 2,3,4,5 way manifolds, GRP instrument enclosures, sunshades and flexible soft instrument enclosures.

GRP instrument protection enclosures attracted a great deal of interest, given the large and constantly increasing number of plants built in extreme environmental conditions. They have the possibility to supply these boxes also with your instruments pre-assembled so that you don’t have problems arising from assembly in the field.