Nearly 100 years of protecting what matters most

Since 1924, Sentry Equipment has been dedicated to protecting the people, products and environments that matter the most. In those nearly 100 years of sampling expertise, we’ve been responsible for many "firsts," including:

Compact helical coil sample coolers | Adjustable ultra-high-pressure reducers
Radiation-shielded sampling stations | Non-coring needle samplers

1924 – The Henszey Company

Sentry Equipment started as The Henszey Company making power plant components and milk evaporators for the Carnation Company.

1959 – Sentry Equipment

Dick Henszey bought the family business and renamed it Sentry Equipment because our products “guarded” material integrity and boiler systems against corrosion. The company was restructured to focus on sampling products and specialty heat exchangers for the power generation industry. This effort lead not only to expansion into other industries, but was also key to engineering and manufacturing complete steam and water analysis systems used to steam monitor water pH in power generation.

1986 - Began employee ownership

Company ownership was transferred to the employees through an Employee Stock Ownership Plan (ESOP). Today, Sentry Equipment is completely employee owned. 

2002 - Acquired the dual heat transfer coil

Acquired from Parker-Hannifin Corp, this tube-in-tube heat exchanger expanded our specialty heat exchangers offerings to include sample coolers, spiral tube, custom helical coil and tube-in-tube heat exchangers.

2003 - Acquired Bristol Equipment Company ISOLOK

The acquisition of Bristol Equipment, with its well-respected reputation in the industry, added liquid, slurry and powder sampling to our portfolio with the ISOLOK automatic sampling line.

2005 - Acquired Gustafson Automatic Samplers

Purchased from Bayer CropScience, the Gustafson sampling handles solid sampling including granules, flakes, powders, pellets serving a range of industries including cement, chemical, plastic, agriculture and food. This addition created the most comprehensive line of samling products for process sampling applications in the world.

2007 - Built new headquarters building

Due to the above acquisitions and organic business growth, Sentry Equipment was bursting at the seams in its previous location. A new facility was designed, and in August of 2007, the entire company was relocated to the 62,000 square-foot facility located 3.5 miles from the original. 

2009 – Named Manufacturer of the Year Grand Award Winner in the medium company category

Sentry Equipment was named a Wisconsin Manufacturer of the Year Grand Award Winner in the medium company category, underscoring our dedication to our employee-owners and customers. This award recognizes Wisconsin companies that demonstrate a commitment to business excellence and for their impact on making Wisconsin a better place to live, work and play.

2009 - Named as a Milwaukee Journal Sentinel Top Workplace

Since our first recognition in 2009, our culture been recognized by a Milwaukee Journal Sentinel Top 100 Workplaces award for seven consecutive years – as long as the program has existed. Based on responses to employee surveys conducted by the research firm Workplace Dynamics, the Top 100 Workplaces award honors for small, medium and large employers that lead in the areas of leadership, compensation, work environment, communication and other factors.

2009 – Received ISO 9001:2008 Certification from DNV

By achieving ISO 9001:2008 certification, we demonstrated our commitment to a highly effective quality system, continual quality improvement, and our focus on providing extra value to our customers. We believe that quality comes first with a commitment to continuous improvement throughout the entire organization.

2010 - Acquired AquaPro Water Chemistry Services (now known as ProShield Lifecycle Services)

Acquiring AquatiPro Water Chemistry Services meant serving our power generation customers with a multi-vendor service organization to maintain and support all brands of water quality instrumentation, analyzers and sampling equipment. The AquaPro services now offered as ProShield Lifecycle services, help circumvent the challenges caused by unplanned downtime, maintenance, and repairs related to the water cycle chemistry processes witin power generation plants. 

2011 - Wisconsin ESOP Company of the Year

This award from The Employee Stock Ownership Plan (ESOP) Association recognizes outstanding employee ownership actively committed to developing the dignity and prosperity of individual employees through combined efforts. The mission of The ESOP Association is the belief that employee ownership will improve competitiveness, increase productivity through greater employee participation and strengthen the American free enterprise economy.

2011 - Acquired Waters Equipment

The sale of Waters Equipment from Neptune Chemical Pump Company, Inc. significantly expanded the Sentry portfolio of steam & water sampling solutions. Together, the Sentry and Waters Equipment product lines offer the highest degree of expertise related to the application, design and manufacture of sampling systems and products.

2011 - Acquired North American rights to the Vanko Analytics Limited/In2Process Pty Ltd. autosampler business 

Granted the North American rights to the In2Process Pty Ltd and Vanko Analytics Limited autosampler business. The product line includes isolatable automatic samplers for use in liquid & slurry pipelines.

2013 - Acquired Accurate Tool Company

The addition of products from the Accurate Tool Company created the Sentry Corrosion Monitoring portfolio to monitor corrosion, inject chemicals, and extract gas and liquid samples from pipelines. As the U.S. pushes for energy independence, maintaining pipeline integrity is top priority of every pipeline operator. 

2014 – Strategic Partnership in Canada

Sentry Equipment took big steps to better serve the needs of the oil and gas industry in Canada by partnering with Benchmark Instrumentation and Analytical Services, Inc. Benchmark will exclusively represent the Sentry Corrosion Monitoring product line throughout all provinces in Canada.

2016 – Launched ProShield Lifecycle Services

To offer sampling service and support for maximum uptime in any application, anywhere, AquatiPro Water Chemistry Services is now ProShield Lifecycle Services. The expanded services provide chemists, engineers, and operation managers the technical support they need to ensure maximum uptime of their sampling and analysis equipment throughout its lifecycle. Highly trained, factory authorized service technicians apply over 90 years of technical expertise to help maintain safe, reliable and efficient performance from installation to equipment shutdown in any process environment.

2017 – Acquired Cobra Sampling and creates the Process Monitoring Tech Center in Houston, Texas

To meet the demand of Refining & Petrochemical customers for process sampling, Sentry Equipment acquired Cobra Sampling, Inc., a gas and liquid sampling provider based in Houston, Texas. The purchase established the Process Monitoring Tech Center (PMTC), a center of excellence to better meet customer demand with a wider portfolio of closed-loop, low-emission samplers, process applicaton expertise and a Gulf Coast responsive service center.

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