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Phone: 1-800-284-3769

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RTD Design Guide

Custom RTD Design Guide. ThermX is a manufacturer of custom RTD probes used for applications in analytical test equipment, heating & cooling systems, aerospace, automotive, transportation, medical, pharmaceutical, chemical processing, food processing, semiconductor processing, power generation and fabrication machinery.

Use our custom RTD design guide as a starting point for your probe. Available in various styles, dimensions and ohmic values, we offer custom designs for monitoring surface temperature, air temperature and direct immersion liquid temperature with a variety of probe types and housings. Housing options include closed end tubes, flanged tubes, ring lug/terminal, flag terminal, hex fitting, threaded hex screw, aluminum block, air flow birdcage and transition probes. We offer both Pt100 ohm thin film and Pt100 ohm wire wound Class A elements for most constructions as well as Pt1000 ohm thin film Class A elements.

For higher temperature industrial applications, we offer mineral insulated probes which are more robust and can be shaped and formed to each application. These sensors are available in longer lengths than the traditional tube and wire RTD design. They are available in 3- or 4-wire designs with 316 SS sheath material. Available sizes include 1/8", 3/16" and 1/4" diameter sheath material. Most constructions can be terminated with a 3-prong plug, 3- and 4-wire Teflon or fiberglass leads and industrial protection heads.

Call for Technical Design Support | Built to Your Specification | OEM Thermocouples
Contact Us With Your Design Requirements 1-800-284-3769

Style "SM" Stick-On RTD
Stick-On RTD
  • Adhesive backing ideal for flat or 
    curved surfaces
  • Rated to temperatures up to 500°F
  • Thin film RTD element
  • 100 & 1000 ohm Platinum 
  • Class "'A" tolerance

Small Diameter RTD Probes

Small Diameter RTDs
  • Rated to temperatures up to 500°F
  • Thin film RTD element
  • 100 ohm Platinum 
  • Class "'A" tolerance

Style "FTR" Flag Terminal RTD

Flag Terminal RTD_
  • Ideal for a variety of surface temperature applications
  • #4, #6, #8, #10 Flag Lug
  • 100 & 1000 ohm Platinum RTD elements
  • Class "A" tolerance

Style "RTR" Ring Terminal RTD

Ring Terminal RTD_
  • Ideal for a variety of surface temperature applications
  • #4, #6, #8, #10 Ring Lug
  • 100 & 1000 ohm Platinum RTD elements
  • Class "A" tolerance

Style "HW" Heavy Duty Ring Lug RTD

Heavy Duty Ring Lug RTD
  • Ideal for a variety of surface temperature applications
  • Low cost
  • 100 & 1000 ohm Platinum 
  • Class "A" tolerance

Style "SR" Surface Mount RTD

Button Surface RTD Probe
  • Ideal for a variety of surface temperature applications
  • Low cost
  • 100 & 1000 ohm Platinum 
  • Class "A" tolerance

Style "HB" Hex Bolt RTD

Hex Bolt RTD
  • Easy installation for surface temperature measurement
  • 100 & 1000 ohm Platinum
  • Class "A" tolerance

Style "HF" Hex Fitting RTD

Hex Fitting RTD
  • Brazed or Welded 316 SS fittings & tubing
  • 100 & 1000 ohm Platinum
  • Class "A" tolerance

Style "PW" Tube & Wire RTD

Straight Tube & Wire RTD
  • General purpose OEM RTDs
  • 100 & 1000 ohm Platinum
  • Class "A" tolerance

Style "PT" Transition RTD

Transition RTDFlex Armor Lead RTD Probe
  • Made from tube & wire or mineral insulated (650°C)
  • 316 stainless steel sheath
  • 100 & 1000 ohm Platinum 
  • Class "A" tolerance

Style "FP" Freezer RTD

Deep Freezer RTD
  • Ideal for freezers, refrigerators & incubators (-90°C to 90°C)
  • 100 ohm wire wound Platinum elements
  • Class "A" tolerance

Style "FR" Flanged RTD

Flange Tube RTD Probe
  • Ideal for air duct temperature measurements
  • 100 & 1000 ohm Platinum
  • Class "A" tolerance

Style "PP" Plug & Jack RTD

Miniature Connector RTD ProbePlug & Jack RTD
  • Low cost 316 SS tube & wire (300°C) or mineral insulated to (650°C)
  • 100 & 1000 ohm Platinum thin film RTD elements
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance

Custom RTD Housing

Custom RTD Housings
  • Custom RTD Housings
  • Send your design for quote or call

Style "RI" Industrial Replacement RTD

Fixed Fitting Replacement Industrial RTDReplacement Spring Loaded Industrial RTD
  • Hex fittings are stainless steel
  • Spring-loaded, Brazed or Weled configurations
  • 100 & 1000 ohm Platinum RTD elements
  • Class "A" tolerance 

Style "PI" Industrial RTD

Industrial Thermocouple
  • Great selection of head styles
  • Hex fittings are stainless steel
  • Spring-loaded configurations
  • Also available with in head 4-20 mA transmitters

Style "AP" Waterproof Air Probe RTD

Waterproof Airway RTD
  • Ideal for measuring wet gas applications & validation of cold storage rooms
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance

Style "AP" Birdcage Air Probe RTD

Birdcage RTD Air Probe
  • Ideal for measuring dry gas applications & electrical cabinets
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance

Style "AB" Aluminum Block RTD

Aluminum Block Surface ProbeDual Aluminum Block Surface Probe
  • Good thermal conductivity for a variety of surface temperature applications
  • 100 & 1000 ohm Platinum thin film RTD elements
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance 

Style "HC" Adjustable Hose Clamp RTD

Adjustable Hose Clamp RTD
  • Ideal for measuring pipe & tubing temperatures in heating & cooling systems
  • 100 & 1000 ohm Platinum thin film RTD elements
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance

Style "ST" Sanitary Cap RTD

Sanitary Cap RTD
  • Ideal for inline sterilization
  • High polish 316 SS sheath & sanitary cap
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance

Style "SH" Industrial Sanitary Cap RTD

Industrial Sanitary Cap RTD
  • High polish 316 SS sheath & sanitary cap
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance

Style "FB" Fixed Bayonet RTD

Fixed Bayonet RTD
  • Ideal for injection molding & composite industries
  • 100 & 1000 ohm Platinum thin film RTD elements
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance

Style "RS" Spring Bayonet RTD

Bayonet Spring RTD
  • Ideal for injection molding & composite industries
  • 100 & 1000 ohm Platinum thin film RTD elements
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance

Style "RB" Adjustable Flex Armor Bayonet RTD

Adjustable Flex Armor Bayonet RTD
  • Ideal for injection molding & composite industries
  • 100 & 1000 ohm Platinum thin film RTD elements
  • 100 ohm Platinum wire wound elements
  • Class "A" tolerance
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