PMC’s Latest Tech Tip: ‘Changing the Temperature Sensing Unit on a Heated Hose’

spray foam tipFounded on the principle of “designed with the customer in mind,” PMC engineers a complete product line for urethane spray systems, including proportioning units, a uniquely designed heated hose system, transfer pumps, spray guns and the auxiliary equipment required by a contractor to successfully and economically apply residential foam insulation, roofing and more.

Manufactured in the U.S., all of PMC’s products, which we are proud to say we offer in our online store, are the direct result of customer input, innovation, creativity and the “perfectionist spirit of its engineers.”

With this said, much of today’s equipment used for spraying plural component spray foam and coatings provide the means to preheat the A and R chemicals, pressurize the chemical to the manufacturers’ recommended PSI, and deliver that conditioned and heated chemical to the gun via a heated hose.

Most of these units utilize a system which provides automatic hose heat. The proportioners are equipped with a controller, which receives a signal from a temperature sensing unit (TSU). The signal indicates the temperature of the chemical in the hose from a remote distance from the proportioner and ideally just before the gun.

These sensing units are better known as TSU, FTS or RTD. They are installed on the hose – and in most cases – are very close to the gun. Since the hoses are dragged over obstacles, dropped, and often experience rough use, the sensing units can break and must be replaced, according to a Technical Service Manager spokesperson at PMC.

And while some other equipment manufacturers provide a sensing unit that is one piece, they typically require that all the hoses be disconnected to replace the unit. Unfortunately, this approach can be time consuming, costly and messy.

PMC’s Solution

PMC offers a Slim Line TSU housing that allows for the thermocouple to be replaced without removing the hoses. When replacing a PMC thermocouple, experts recommend that you place the TSU on a bucket, which can prevent chemical from leaking on the floor.

Here are the next steps to take:

  • Bleed down the pressure on your system
  • Unplug the TC or RTD harness
  • Remove the old thermocouple and insert a replacement
  • Tighten the fitting, reconnect the harness, bleed the system and you are ready to spray.

For more information, or for details about spray foam equipment, including mobile spray rigs, visit Intech Equipment and Supply today.