Over one million of these accurate, affordable surface thermometers are in service throughout the world. For more than fifty years, PTC has been manufacturing this series of specialized thermometers. With many temperature ranges to choose from, the dual magnet surface thermometer is the logical choice for making surface measurements.

Model 313F

Single Ancillary Hand

This handy, resettable peak reading hand is available as an accessory on PTC’s dual magnet mount, four magnet mount, and tab mount surface thermometers. The ancillary hand is reset by turning the reset knob on the front of the thermometer. A non-impeding magnetic clutch holds the hand in place at either the maximum or minimum temperature reached during a cycle.

Dual max-min ancillary hands

Max-min hands are available on PTC's dual magnet mount, four magnet mount, and tab surface thermometers as an accessory. The max-min hands remain at the highest and lowest temperatures reached until they are reset. Hands are reset by using the reset knob and magnetic wand (part number 314.5 MM).

Magnetic Wand
314.5 MM (left)
Model  312MM
(right)

• Accuracy ±2% of full-scale range
• 2" diameter x 1/2" high
• Weighs only 1-1/2 oz.

• Select Fahrenheit or Celsius ranges
• Optional single or dual Max-Min hands
• Optional tab mounts

Features

• Accuracy ±2% of full-scale range
• 2" diameter x 1/2" high
• Weighs only 2 oz
• Select Fahrenheit or Celsius ranges
• Optional single or dual Max-Min hands

Model 350FRR

Tab mounts can be ordered in place of the standard dual magnets. Two types of tabs are available for these thermometers. Tab 1 is an on-surface mount and tab 2 is an in-surface type mount. The drawings below show both styles of mounting.

For in-surface mounting, a hole 1-1/8"diameter by 1/4" deep needs to be machined in the surface to be measured. Pilot holes also need to be drilled for the tab mounting screws. Both styles of tabs have holes for the screws. When ordering, please specify whether tab 1 or tab 2 mounting is required.
 

These handy surface temperature thermometers have served the industry for over fifty years. With their unique design, the bimetal sensor is protected from contaminants and damage from handling. With an accuracy of ±2% of full scale range, these thermometers give fast and accurate temperature measurements with an inexpensive instrument.

Model 310C

Cross-section of fully enclosed surface thermometer shown with optional magnet lead spring accessory.

• Fully enclosed -- bimetal protected from damage
• Accuracy ±2% of full scale range
• 2" diameter x 1/2" high
• Weighs only 1 oz
• Select Fahrenheit or Celsius ranges

Accessories

Part No. 310.7 Magnet & Leaf Spring.
Part No. 310.8 Silicone Grease Adhesive.

These accessories can be used to attach the thermometer to almost any flat non-horizontal surface. The magnet and leaf spring will hold the thermometer to any magnetic (ferrous) surface. Applying a thin coat of the silicone grease to the back of the thermometer will hold it to a nonmagnetic surface.
 

• Very fast response time
• Accuracy ±2% of full scale range
• 1-3/4" diameter x 1/2" high

• Weighs only 1/2 oz.
• Select Fahrenheit or Celsius ranges
• Optional dual Max-Min hands

These handy pipe-surface thermometers will fit pipes having OD's of 3/4" and up. An included spring kit allows the instrument to be attached to a pipe or cylinder up to 6" in diameter. Additional kits can be ordered and the springs combine to accommodate larger diameters.

The spring kit (Part No. 486.84), shown to the right, includes three stainless steel springs 3/4", 2", and 4" in length. Clips are also included to attach the springs to the thermometer.

The bimetal sensor is protected from drafts by an insulating cup which also acts as the unit's base. The cup is made from high temperature plastic for the lower ranges. Models 488F and 488C have an aluminum insulating cup for higher temperatures (up to 500°F).
   

Model 483F

Cross section of spring held pipe surface thermometer shown mounted to pipe
   

• For pipes with OD's of 3/4" and up
• Accuracy ±2% of full-scale range
• 2" diameter x 1" high
     

• Weighs only 1-1/2 oz
• Select Fahrenheit or Celsius ranges
• Spring kit included with each thermometer
     

• Accuracy ±2% of full scale range
• Snaps instantly into place
• Sizes to fit 3/4" to 2-3/8"OD pipes
• 2" diameter x 1" high
• Weighs approximately 1 oz.
• Select from six temperature ranges
• Fast response time
     

These thermometers will measure surface temperatures in a space as small as 1" x 1"; with an accuracy of ±2% of full scale range. The small size of these instruments allows minimum "heat-stealing" from the heated surface.
   

US nickel next to
Model 675F

The bimetal sensor is protected from drafts with a cup which also acts as the units base. The bimetal sensor comes in close thermal contact with the surface to be measured, providing the thermometer with a fast response time.

The 675 series can be used for testing the temperature of electronic parts. An isotherm of an area can be constructed by employing several of these instruments and then plotting the readings.

• 3/4" diameter x 3/8" high
• Weighs only 0.2 oz
• Accuracy ±2% of full scale range
• Select Fahrenheit or Celsius ranges

   
Cross section of thermometer on heated surface
   

These I/R thermometers are designed to measure the radiation temperature of a source. Although specifically intended for radiation temperatures, these thermometers will also accurately measure surface temperatures.

Radiation temperatures from sources such as: calrods, wire and ribbon resistance heating elements, gas operated heat transfer panels, and incandescent lamps can be measured. These models come with a maximum reading hand, which will retain the highest temperature reached during a cycle.

Features

• I.R. oven & surface thermometer
• Accuracy ±3% of full-scale range
• 1-21/32" diameter x 9/16" high
• Weighs approximately 0.2 oz.
• Very fast response
• Models 580FM & 580CM come with magnet & leaf spring

Model 580F