We all can appreciate the need for an accurate thermostat to regulate temperatures within a home or building. But for some industries, the accuracy of a thermostat is an absolute necessity for safety and to protect the equipment inside. Narrow differential thermostats are used in heat-treating ovens. Those industries include:

• Heavy construction machinery
• Aerospace
• Mining
• Metalworking
• Tool and die sectors

Typical heat-treating applications include aging, annealing, baking, brazing, drying, hardening, normalizing, solution-treating, tempering, and more.

The temperature differential refers to the variance between the temperature outdoors and whatever it is indoors. If you’re trying to cool the building to 72°F and it is 100°F outside, the thermostat will work harder to catch up. And with heat-treating ovens and furnaces that reach temperatures as high as 1400°F, you need a thermostat with a narrow differential to ensure the building is kept cool enough inside without error.

This is where Calco Electric’s narrow differential thermostats excel.

Narrow Differential Thermostats Require Extreme Precision

Narrow differential thermostats need the ability to turn on and off at close tolerances. A narrow differential allows the heat to turn on and off rapidly. Calco Electric’s narrow differential thermostats provide the following benefits:

• 100% regulated temperature
• Snap action and creep action
• Personalized wire length and type
• 100% RoHS Compliant
• 100,000 life cycles for long-term capacity
• Personalized terminals located at the same or opposite ends
• Use of a snap action with bimetal discs to open and close the contact
• 17AME-H thermal switch
• The lowest temperature is from 0°C to 180°C
• High resistance to shock and vibration

Thermostats have adjustable temperature settings that determine how often the system cycles. A low differential setting is similar to a narrow differential setting. The tighter this setting, the more the system will cycle and the tighter the temperature will remain. A broad differential setting will result in longer cycle times. But where heat-treating ovens are used, that wide setting can be problematic.

Three Advantages of Narrow Differential Thermostats

Though a wide differential can increase efficiency and extend equipment life in most circumstances, it’s not ideal for personal comfort. It can be dangerous where heat-treating ovens are in use. For this reason, a narrow differential thermostat will provide the following advantages.

• Ability to control the temperature of an application under a minimal range
• More comfort for personnel working close to ovens that can reach temperatures as high as 1400°F
• Heat-treating ovens do not have the same compressor minimum run-time constraints - rapid cycling from a wide differential would cause excessive wear, and tear - narrow differential thermostats are far more efficient and effective
• Safer working conditions for employees in close proximity to heat treating ovens

Contact Calco Electric for More Information

For more details about narrow differential thermostats and the benefits they can provide for your application, contact the team at Calco Electric. Our experienced, trained staff will gladly answer any questions you have about these thermostats.