Test Chamber

Environmental Test Chamber Service

Why DENMARK is the best value anywhere… We respond to emergencies immediately and are world-class troubleshooters. We are committed to saving our customers money through wise choices. The counsel we provide our customers is drawn from the perspective of: “How would we proceed if it was OUR money we were spending?”

These are some of the Brands we service

We provide expert care for all the industry’s premium manufacturers, including: Allegan, American Research, Associated Environmental, AES, B-M-A, Bemco, Blue M, Cincinnati Sub-Zero, CSZ, Conrad, Despatch, ESI, Environmental Specialties, Espec, Forma, FTS, Harris, Hotpack, Kelvinator, Labline, Lunaire Environmental, Missimers, Neslab, New Brunswick Scientific, Norlake, PGC Aminco, Polycold, Precision Scientific, RapidTherm, Ransco, Revco, Rush, Russells, Sexton, Shrader Scientific, So-Low, Standard Environmental, SES, Telemark, Tenney, TestEquity, Thermodynamic Engineering, Thermotron, Virtis, Vista, Webber Environmental, Weiss and Western Environmental.

Test Chamber

Denmark Heating and Cooling Test Chamber Group located in Michigan, Specializes in Environmental Chamber Service. Repair, Calibration, Installation of Environmental Test Equipment and Low and Ultra-Low Temperature Refrigeration Systems. We are fully equipped to provide repair and NIST Traceable Calibration services for all sensitive environmental test equipment.

Denmark Heating and Cooling have over 20 years experience supporting service for several leading manufacturers of Environmental Test Equipment. All phases of Installation, Calibration, Preventative maintenance and repairs for Chambers, VOC Recovery, Stability Rooms, Burn-In systems, ECA’s and Vacuum systems. We are experts in Cascade Refrigeration and Microprocessor Controls. Make Denmark of Michigan your choice for servicing your Environmental Test Equipment.

Do You Really Need Service?

Sometimes it seems the equipment needs servicing but in reality it’s a minor problem that can be corrected by the user. We at Denmark would like to offer a few checks for our customers and potential customers. 1. Make sure power is on. Sounds simple but sometimes the main power could trip due to a power surge or spike. 2. Is the controller set properly for the desired conditions? 3. All circuit breakers in the on position? After confirming all of the above and chambers still does not operate you may need service. Feel free to contact us at 734.722.3870 to arrange for a service call.

We are Leaders in servicing low temperature, ultracold freezers, super cold freezers, sub-zero medical freezers, biomedical freezers, laboratory freezers, lab freezers, blood plasma freezers, hospital freezers, specimen freezers, pharmacy freezers, cell culture storage freezers, cryogenic freezers, freezer cabinets, concrete freeze/thaw testing equipment, concrete test systems, industrial freezers, freezer manufacturers

Our Customers Love to Say: “I like the fact that you provide warranty and after-warranty support for our chambers. We own quite a few chambers from many manufacturers and already have a good relationship with Denmark. I can’t stand Therxxxxxx (another environmental chamber manufacturer) who will only let their own service group repair their brand for ridiculously high prices.”

Denmark Environmental Test Chamber Group Special Service Offer

Denmark Test Chamber Program offers an all-inclusive service agreement for emergency service, refrigeration retrofits, calibrations, preventive maintenance, equipment relocation, instrument upgrades, equipment startups, installations, parts, and materials. In addition, our service program offers many additional valuable cost-saving benefits. Of course some of the chamber manufacturers will claim their service is better but we here at Denmark have been servicing all brands of chambers for over 30 years, therefore our factory trained service department technicians are highly skilled and can get your chamber back on-line quicker for less money than you would spend with a chamber manufacturers service department with their high overhead costs.

  • Test ChambersEquipment Start-Up
  • Preventive Maintenance Contracts
  • Instrumentation Upgrades
  • Refrigerant Modifications
  • Instrument Calibration
  • Emergency Service
  • Equipment Modifications
  • Equipment Relocation

By Becoming a Denmark Heating and Cooling Service Customer You Can Take Advantage of:

  • Labor rate: 16% off current local labor rate
  • Travel time: 26% off current service rate
  • Mileage: No charge
  • 11% discount on all parts and materials
  • 16% discount on selected instrument calibrations
  • 4 hour emergency chamber service if ordered by 2:00 PM Eastern Standard Time M-F
    (applies within a 45 mile radius of Westland Michigan.)
  • 24 hour service available

Denmark Heating And Cooling Preventive Maintenance Program (P.M.)

Our comprehensive maintenance checklist addresses every part, system and function of the environmental chamber. These include the chamber cabinet, electrical system, refrigeration system, humidity system and all accessories and options the chamber was ordered with. Bi-annual PM’s are recommended. Current “PM” customers experience much fewer or no repairs between bi-annual(twice a year) PM’s, thus eliminating emergency service calls and testing interruptions.

Chamber cabinet

  1. Remove plenums and check heaters, circulators, and condition of refrigeration coils. Also, check and reseal any openings through a rear wall for piping, tubing and electrical wiring pass-thru’s.
  2. Check condition and location of all sensors.
  3. Ensure all drains and drain tubing are clear.



  • Check all electrical connections and tighten wiring.
  • Check all electrical components for proper resistance and continuity.
  • Check input voltages, fuses and amperages of all components.
  • Check condition and operation of all SSR’s and relays.



  • Remove rear access panels and inspect refrigeration solenoids, capillaries, tubing and components.
  • Adjust refrigerant lines and capillaries from chaffing.
  • Inspect compressors oil levels, refrigerant charges, temperatures and pressures.
  • Check refrigerant systems for leaks.
  • Confirm operation of solenoids and adjustment of pressure regulators.



  • Clean and flush humidity generator, piping and related accessories.
  • Check high limit cut-out switches
  • Adjust water float levels and replace wet socks.

“NIST” Certified Calibrations


  • Calibrate/verify controller TC and or RTD inputs.
  • Calibrate/verify controller DC voltage and milliamp inputs such as Rotronic and Vaisala humidity sensors.
  • Calibrate chart recorders.
  • Calibrate product saver/high limit controls.

PM Agreements can be quoted with or without calibrations. Minor repairs and adjustments are included with the PM work. If the chamber needs a major repair, a reasonable, cost-effective on the spot quote will be given and repairs can be completed immediately. This avoids additional travel time expenses and further chamber downtime.

  • custom, standard, retrofitted environmental test chambers
  • ess chambers
  • accelerated stress chambers
  • agree chambers
  • altitude simulation
  • temperature and humidity chambers
  • humidity simulation
  • stability chambers
  • thermal chambers
  • climatic/climate chambers
  • vibration test chambers
  • drive-in chambers
  • vehicle test chambers
  • medical incubators
  • explosion-proof chamber
  • emc test systems
  • stability rooms
  • lab freezers
  • liquid nitrogen freezers
  • ultra cold freezers
  • cooling tunnels
  • environmental simulation chambers
  • environmental stress screening chambers
  • walk-in chambers
  • altitude chambers
  • temperature chambers
  • humidity chambers
  • humidity control systems
  • temperature cycling chambers
  • thermal shock chambers
  • custom climatic control systems
  • vacuum chambers
  • dynamometer chambers
  • scientific incubators
  • lab incubators
  • laboratory test chambers
  • environment test rooms
  • industrial freezers
  • cryogenic freezers
  • super cold freezers
  • low temperature freezers

Since 1972, We have serviced custom and standard environmental chambers, retrofitted environmental and test equipment for laboratory, product testing, manufacturing testing applications. We at Denmark service environmental simulation equipment, ess, walk-in, environmental stress screening, agree chambers, altitude chambers, altitude simulation, temperature chambers, temperature and humidity chambers, environmental test chamber manufacturers, humidity chambers, humidity simulation, humidity control systems, stability chambers, temperature cycling, thermal test chambers, solar panel test chambers, thermal shock, climatic/climate chambers, vibration test chambers, drive-in and dynamometer (dyno) chambers, scientific incubators, cell culture incubators, explosion-proof chambers, laboratory test chambers, emc test systems, environment test rooms, stability rooms, industrial freezers, lab freezers, cryogenic (cryo) freezers, liquid nitrogen freezers, super cold freezers, ultra cold freezers, low temperature freezers, cryo traps .

Testing methods can range from as simple as temperature testing or can be extremely complex such as those with combined environmental testing applications. The following is a brief overview of only some of the most popular testing methods being used today.

Temperature Temperature change is one of the most common stresses applied to a product. Temperature cycling is the process in which a product is subjected to multiple cycles of changing temperatures between predetermined extremes at relatively high rates of change fatiguing and causing inferior products to fail. It provides an excellent way to determine failure and analyze reliability of a product. Cycling will show at what temperature, both high and low, a product will cease to function properly. Most manufacturers have a standard high temperature range from +177°C to +190°C for reach-in chambers and welded walk-ins; however, it is possible for higher temperatures to be achieved with special construction and materials. To achieve low temperatures, manufacturers offer several refrigeration options. Liquid Nitrogen (LN2) is one popular refrigerant that allows temperatures to be as low as -184°C. Carbon Dioxide (CO2) is another popular refrigerant however it can only achieve a low temperature of -68°C. A final option is mechanical refrigeration. Mechanical refrigeration uses compressors to lower the temperature of the chamber and is available in two configurations: single stage and cascade. Single State uses only one compressor and is able to bring the temperature down to -40°C. Cascade uses two compressors in order to bring the chamber temperature down to -73°C or lower. A cascade refrigeration system consists of two interdependent refrigeration systems. The low-stage provides cooling to the chamber interior through a finned evaporator coil, which is located in the air plenum. The high-stage provides cooling to the cascade condenser. The cascade condenser is a heat exchanger that has one circuit which is the evaporator of the high-stage, and another circuit which is the condenser of the low-stage.

Humidity Excess moisture is very damaging to a multitude of products especially electronics causing corrosion and oxidation. Low humidity levels can cause brittleness as well as interact with certain to cause high electrostatic discharge (ESD) conditions. Humidity testing allows a manufacturer to see how their product will perform in these conditions. Most manufacturers offer environmental test chambers ability to achieve 10% to 98% RH although, similarly to temperature, humidity levels can also be customized.

Thermal Shock Rapid temperature changes from extreme cold to hot environments thermally shocks and stresses a product. This causes permanent changes in electrical performance and can cause sudden overloading of materials. Thermal shock can be liquid-to-liquid, a product is immerse and transferred between hot and hold baths, or air-to-air, where the product is moved from a hot chamber to cold chamber. Thermal shock failures are due to thermal mismatches or materials with differences in rates of thermal expansion and contraction.

Altitude Testing for altitude allows a manufacturer to simulate the effects of low pressure and high altitude on their product. Most environmental test chambers are able to simulate altitudes of up to 200,000 feet above sea level. Altitude testing is important for manufacturers of products that might be shipped via air and is especially important for the defense and aerospace applications.

Vibration At some point in its life a product will come in contact with vibration whether during production, transport or use by the end user. By performing vibration testing, manufacturers can determine if a product can withstand the rigors of its intended use environment. Most manufacturers offer shakers that are able to perform Sine, Random, and Shock vibration tests. Oftentimes, vibration is combined with another test method during testing.

Highly Accelerated Stress Testing (HALT) HALT uses step-by-step cycling of environmental variables such as temperature, shock and vibration in order to force products to fail. It performs vibration testing in all three axes using a random mode of frequencies. HALT testing can include the simultaneous cycling of multiple environmental variables (an example: temperature cycling and vibration testing) providing a closer approximation of real-world operating environments. Used as part of the product design process, HALT subjects a product to increasing stresses to ensure the basic design is reliable.

Highly Accelerated Stress Screening (HASS) HASS testing applies stresses similar to those used in HALT and is an on-going screening test, performed on regular production units. However, this type of testing does not wish to damage the product instead it aims to verify that actual production units continue to operate properly. HASS uses environmental variables such as fast temperature cycling, shock and multi-axis vibration as a means of screening 100% of production units. It ensures that the entire final product will be reliable.

Environmental Stress Screening (ESS) ESS is a means of screening products to expose detects (such as defective parts or process problems) that can’t be detected by visual inspection or electrical testing. It was developed as a means of detecting product defects and production flaws in electronics. Typically ESS uses thermal cycling or vibration to expose failures. ESS can be performed as part of the manufacturing process.

AGREE The Department of Defense Advisory Group on Reliability of Electronic Equipment or AGREE method of testing was originally designed to perform specific temperature, humidity and vibration tests in order to improve the quality and reliability of military hardware and to conform with MIL-STD 781 and 883. Today, AGREE test equipment is used to perform reliability, qualification and ESS for many industries including electronics, automotive and telecommunications equipment. AGREE chamber manufacturers usually offer chambers capable of temperatures ranging from-73°C +177°C and humidity levels ranging from 20% to 95% RH. Types of Environmental Test Chambers The environmental testing industry offers many types of test chambers ranging from small benchtop style chambers to chambers as large as a room. The test application and product loading requirements will primarily determine the type of chamber needed.

Benchtop Chambers Benchtop chambers are the smallest size of environmental test chamber typically ranging from 0.5 cubic foot to 5.5 cubic feet. Designed to provide a compact chamber for testing small components and products, benchtop chambers are able to simulate a full range of temperature and sometimes humidity conditions. Benchtop chambers are great for testing small products, sub-assemblies and components in laboratories with limited space.

Upright or Reach-In Chambers Upright or reach-in chambers are another popular chamber configuration on the market today. These chambers can range from 4 to 70 cubic feet or larger and are able to simulate almost any environment. Temperature, humidity, altitude, rain, solar and vibration are just some of the environments that can be produced by an upright or reach-in chamber.

Walk-In Chambers Walk-in chambers are environmentally conditioned rooms ranging in size from those big enough to step into or those large enough to drive into. They can be used to test large components, assemblies and finished products, from computers and copiers to automobiles and satellites throughout a wide range of temperature and humidity environments. Walk-ins can also be used as a laboratory environment for conducting test procedures in food processing, pharmaceutical, and scientific applications. Walk-in chambers are able to be built to almost any size or configuration. There are two major types of walk-in chambers constructions: modular and welded. A modular or panel walk-in is made from pre-fabricated panels. This type of walk-in is made for fast and simple installation. Modular walk-ins offer great flexibility in designing interior work space and can assembled to meet virtually any test or size requirement. However, due to this construction the temperature and humidity range is limited. Solid or welded walk-ins are made similarly to upright chambers. The chamber is welded together internally which makes this chamber more apt for high temperature testing. This style of walk-in chamber also may withstand altitude conditions. Welded walk-ins are often custom designed to best fit a clients testing requirements.

Thermal Shock Chambers Thermal shock chambers have the ability to shock a product by moving it from a high temperature to a low temperature. With two or three separately controlled temperature zones between which products are automatically transferred, they thermally shock and stress a product quickly, exposing its reliability in the process. These chambers are available in different sizes and configurations depending on testing requirements. Traditionally, temperature shock tests were performed in accordance with military test standards for components such as electronic chips, integrated circuits and printed circuit boards.

However, today most commercial reliability and quality control programs require rapid and extreme temperature change testing. Environmental test chambers and environmental testing allow organizations to design and produce products that are more reliable and safer for their intended end use. It also saves money and time as well as the organization’s reputation through improved in customer satisfaction. While there are many things to consider when choosing an environmental test chamber and many different methods of tests that can be performed, the decision to perform testing is critical to the success of a product.