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Solar Products Panel Heaters Temperature Sensing Options

Solar Products Flat-faced Radiant Panel Heaters
Solar Products, Inc.
228 Wanaque Ave 
Pompton Lakes, NJ 07442

We are a distributor for Solar Products, Inc.

Custom Thermocouples Available Upon Request

Thermowells are not required on all heaters. Heaters are sometimes controlled with percentage timing devices, which switch the heater on and off based on a time cycle or by means of an optical thermometer. The temperature sensitivity of the application dictates the need for a closed loop, which makes use of a temperature controller and a temperature sensing device, or an open loop, which does not make use of a temperature sensing device and commonly operates on a percentage on/off basis.

The end mount thermowell is the most common design. The thermowell is either a quartz tube (most common due to faster response) or ceramic tube located parallel to the heating element. The tube is typically 5" (127mm) long and has an inner diameter of 0.157" (4mm). A thermocouple bracket is mounted outside the thermowell tube for the purpose of properly positioning and holding the thermocouple in place. The thermocouple is then located 4" into the thermowell and fastened using the bracket. It is important to assure that the thermocouple is not over extended into the thermowell. This may result in incorrect temperature readings or heater failure. A thermocouple with a male plug is displayed.
The back mount design makes use of an L-shaped quartz tube that runs perpendicular to the coil toward the back of the heater. The thermowell then makes an arced 90 bend, continuing for a short distance parallel to the heating element. This design is used when the heaters are surrounded, not allowing side access, and requires the use of a .040" (1 mm) diameter thermocouple in order to make the 90 bend. A thermocouple with a male/female plug combination is displayed. This design is not available for the Q-Series.
The bayonet style thermowell is sometimes used with the metal, koramic, glass or quartz face heaters to measure the actual face temperature (emitting surface) as opposed to the heating element temperature. The thermocouple goes through a bayonet fitting and is compressed using a stainless steel spring. This approach assures that the tip of the T/C makes good contact with the heater face.


It is becoming more common for equipment manufacturers and end users to make use of optical pyrometers (non-contact thermometers) to sense the product temperature as opposed to the heater temperature. In virtually all applications, the product temperature is the temperature of choice. The heater temperature is only used as a reference in order to attain a particular product temperature. The price reduction of these devices and the quest for better process control has driven the use of optical pyrometers. For that reason, it is sometimes necessary to provide an opening (1.5" - 2" (38 - 51mm) diameter hole) through the heater where the optical pyrometer can be placed to monitor the product temperature. The hole size can vary based on the specific requirements. A smaller hole is always preferred to avoid non-uniform heating of the product.
Solar Products panel heaters are covered by a one year warranty against manufacturing defects.

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We are a distributor of infrared heaters. Always consult manufacturers installation instructions for proper installation of the products or systems shown on this website. © Copyright 1999-2019 Mor Electric Heating Assoc., Inc.

5880 Alpine Ave. NW - Comstock Park, MI 49321  USA
Tel 616-784-1121 - 800-442-2581 - Fax 616-784-7775

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