CHR Inc. offers a wide variety of heating solutions approved for Classified Environments’ often these can be referred to as Explosion Proof Heaters or Hazardous Location Heaters.

Each heating application performed in a Classified Environment needs to be evaluated carefully to ensure that the safety requirements of environment are met and of course the heating task is successfully accomplished.

The staff at CHR Inc. is well prepared to design and deliver heating solutions which comply with the needed regulations, accomplish the heating task and most solutions are maintenance free.

CHR Inc. offers two main types of Hazardous Location Heaters for classified environments – Heating Jackets and Induction Heaters.

Explosion-Proof Heating Jackets are available in both Standard or Custom sizes.

Standard sized containers

  • 5 gallon pails & buckets
  • 30 & 55 gallon drums
  • 275 gallon IBC Totes
  • Gas Cylinders – size A, K, B, C & FX

Custom-sized built to order Explosion Proof Heaters are common for CHR Inc. and we are always available to quote to meet your needs.

The Heating Jackets are made in two different styles, Self-Limiting Heating Element or Temperature Controlled.

Self-Limiting Heating Jackets for Classified areas

These approved Heating Jackets are ideal for gentle warming or to avoid winter freezing.

They are constructed with a silicone coated fiberglass outer fabric and utilize a high density fiberglass insulation. Safe operating conditions are maintained even in the presence of potentially explosive gases. No transformers are required as they operate using a standard 120v or 240vac supply.

CHR Inc.’s line of self-regulating Heating Jackets are designed to fit around containers of size 5, 15, 30 and 55 gallon drums and other common sized containers .  Custom sizes are always available!!!

A self-limiting temperature of around 75°F above the ambient temperature will be maintained on the drum wall (with a 68°F ambient temperature, the drum wall temperature will be around 140°F). If lower temperatures are required, the heating jacket may be fitted with a thermostat (0-122°F), allowing the user to reduce the heating jacket temperature. The thermostat must be adjusted whilst the jacket is situated within a safe area.

Temperature Controlled Heating Jackets for Classified areas

CHR Inc.’s line of Temperature Controlled Heating Jackets can be used when more power is required or more precise temperature control is needed.  These specialized Heating Jackets can be designed for Class 1, Division 1, Zone 1 or Class 1 Division 2 Classified Hazardous locations.

The most economical method is to utilize an internal thermostat to regulate the Heating Jacket’s temperature.  As with all Classified heating applications the maximum allowable temperature the Heating Jacket can reach needs to be carefully evaluated looking at the T-code rating (or Temperature Code) for the material being heated.

Should different temperatures be required at different times or more precise control is needed we can offer Digital Temperature Controller options as well.

Induction Heaters – These specialized Hazardous Location Heaters offer some distinct advantages to traditional heating solutions. Utilizing a single induction coil, completely encapsulated in a cylinder made from a glass reinforced resin, this Induction Heater was specifically developed for chemical plants. The cylinder is simply placed over the drum. Contact is not required. Induction Heaters create heat in metals with magnetic properties without the heater itself getting hot.

This allows the Induction Heater to provide a great deal of heat/power, heat the contents very evenly and comply with Class 1, Division 1, Zone 1 requirements.

CHR Inc. offers 3 common sizes of Induction Heaters

  • Full Height 55 gallon drum heater
  • Half Height 55 gallon drum heater
  • Base Drum Heater

The weight of Full Height Induction Heater is far less than the weight of a full drum and can be easily lifted and placed over the full drum.

CHR’s Induction Heaters will heat the metal vessel to a temperature of 250°F. If allowing the system to run to its maximum potential is not desired, our Explosion Proof Heaters can be run for specified amount of time and then shut off or a Digital Temperature Controller can be used.

Should the application require accurate temperature sensing and control it is possible to utilize a Digital Temperature Controller and comply with the requirements of the classified area.

There are two ways to incorporate a Digital Temperature Controller

  • An ordinary environment Temperature Controller can be used but since it is only approved for an ordinary environment it must be placed outside the Classified Environment and connected with a power cable of sufficient length.
  • A classified area Temperature Controller can be used in the same area as our Hazardous Location Heaters. It should be understood that the Induction Heater itself is inherently safe and the classified area approved Temperature Controller is not what is making the system compliant; it is only providing an accurate temperature control method.

Whatever your application CHR Inc.’s line of Classified Hazardous Location Heaters can provide a solution. Give us call today to get the proper heater quoted to you today.

Class 1, Div 2 Hazardous Location Approvals

  • Class I Division 2, Groups ABCD, T3
  • Class I Zone 2, IIC, T3
  • Class II Division 2, Groups EFG, T3
  • Class II Zone 22, IIIB, T3
  • Class III Division 1 and 2, T3 (T4 rating available on request)

Class 1, Div 1, Zone 1 Hazardous Location Approvals

  • Class I, Div 1, Zone I, IIC, T3
  • AEx e IIB+H2 T3 Gb
  • Ex e IIIB+H2 T3 Gb

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