Sentry Equipment - Sampling Systems - Sampling Equipment

Telephone:  +1-262-567-7256


The History of Sentry Equipment Corp

Sentry Equipment Corp began in 1924 as The Henszey Company, a primary supplier to The Carnation Company, which was in need of dairy/power plant components and milk evaporators. In 1959, The Henszey Company changed its name to Sentry Equipment Corp, and restructured and focused its efforts toward 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 systems used to sample steam and continually monitor water pH – two very important elements necessary to generating power.

Sentry Equipment Corp is an innovative company responsible for many "firsts" including:

  •  compact helical coil sample coolers
  •  adjustable ultra high pressure reducers
  •  radiation-shielded sampling stations; and
  •  non-coring needle samplers

1986 - Began employee ownership

Company ownership was transferred to the employees through an ESOP (Employee Stock Ownership Plan). Today, the company is completely employee-owned. The company employee-owners participate in making continual improvements to our products and processes at every level. This is emphasized in our corporate vision statement: Every Employee an Owner, Every Customer a Commitment.

2002 - Acquired the dual heat transfer coil

Sentry Equipment Corp acquired this product line from Parker–Hannifin Corp. This tube-in-tube heat exchanger expanded Sentry Equipment Corp’s offerings of specialty heat exchangers – we now offer sample coolers and spiral tube, custom helical coil and tube-in-tube heat exchangers.

2003 - Acquired Bristol Equipment Company ISOLOK

Sentry Equipment Corp acquired Bristol, which had a well-respected reputation in the industry for providing unique solutions for the sampling of liquid & slurry and powder materials with the ISOLOK® automatic sampler.

2005 - Acquired Gustafson Automatic Samplers

Sentry Equipment Corp acquired this product line from Bayer CropScience. The Gustafson sampler line provided sampling solutions for a variety of solid materials including granules, flakes, powders, pellets and slurries, and served a range of industries including cement, chemical, plastic, coal, feed/grain, food, dairy and fertilizer. This addition to Sentry Equipment Corp’s existing line of manual and automatic samplers for gases, liquids, slurries and solids created the most comprehensive line of products for process sampling applications in the world.

2007 - Built new headquarters building

Due to the above acquisitions and organic business growth, Sentry Equipment Corp was bursting at the seams in its previous location. A new site and new building were designed to fit Sentry's needs and in August of 2007 the entire company was relocated to the 62,000 square-foot facility located 3.5 miles from the original, and just off the interstate. 

Summer 2010 - Acquired AquatiPro Water Chemistry Services

As the need for water chemistry instrument sustainability and employee productivity became a key initiative for power plants, Sentry Equipment Corp met that need by acquiring AquatiPro™ Water Chemistry Services. AquatiPro Water Chemistry Services is the only multi-vendor service organization to maintain and support all brands of water quality instrumentation, analyzers and sampling equipment. As many water chemistry departments are discovering, the services of the AquatiPro team are key to helping circumvent the challenges caused by unplanned downtime, maintenance, and repairs related to the water cycle chemistry processes. As a result, power plant chemistry departments and water treatment facilities have experienced an increase in employee productivity and instrument uptime, while seeing a decrease in costs associated with maintaining their equipment.

Spring 2011 - Acquired Waters Equipment

Sentry Equipment Corp acquired Waters Equipment™ from Neptune Chemical Pump Company, Inc. The addition of the Waters Equipment brand significantly expanded Sentry Equipment Corp’s global portfolio of steam & water sampling products. Together, the Sentry Equipment Corp and Waters Equipment product lines offer the highest degree of expertise related to the application, design and manufacture of sampling systems and products. This not only ensures the specific needs of each customer and application continue to be met, but improves the availability of products, engineering expertise and numerous aftermarket services.

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

In December 2011, Sentry Equipment Corp acquired 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.

Fall 2013 - Acquired Accurate Tool Company

The addition of Accurate Tool Company’s products significantly expanded Sentry Equipment Corp’s process products and systems portfolio to include Pipeline Integrity Products, which monitor corrosion in, inject chemicals into, 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. The Accurate Tool acquisition positioned Sentry Equipment Corp for significant future growth in the global energy field.

Every Employee an Owner
Every Customer a Commitment



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Sentry Equipment Corp  |  966 Blue Ribbon Circle North  |  Oconomowoc, WI 53066 USA  |  +1-262-567-7256  |

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