McMaster-Carr logo
    Filter by
    System of Measurement
    Mount Type
    Probe Diameter
    Pipe Size
    Industrial Info Compare
    Probe Connection Pipe Size
    Industrial Info Snippet
    RTD Sensor Connection
    RTD Probe Resistance
    Probe Connection Gender
    Display Type
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    35 Products

    Thermocouple and RTD Connection Heads

    Image of Product. Front orientation. Thermocouple and RTD Connection Heads. Screw-On Cap with Retaining Chain.

    Screw-On Cap with

    Retaining Chain

    Attach these heads to your thermocouple or RTD probe to protect wiring from dust and moisture. The removable cap makes it easy to access your wiring when you need. Install an optional terminal block inside the head to keep your wiring organized.
    Hazardous Locations—Hazardous location connection heads are rated for use in Class I, Divisions 1 and 2, Groups A, B, C, and D; Class II, Divisions 1 and 2, Groups E, F, and G; and Class III, Divisions 1 and 2 environments with flammable gases, combustible dust, and combustible fibers.
    Probe
    Connection
    Conduit
    Connection
    Pipe
    Size
    Thread
    Type
    Gender
    Pipe
    Size
    Thread
    Type
    Gender
    Includes
    Environment
    Hazardous Location Rating
    Enclosure
    Rating
    Each
    Aluminum
    1/2
    NPT
    Female3/4
    NPT
    FemaleScrew-On Cap with Retaining ChainCorrosive, Dusty, Hazardous, Outdoor, Washdown, WetNEC Class I Divisions 1, 2 Groups A, B, C, D
    NEC Class II Divisions 1, 2 Groups E, F, G
    NEC Class III Divisions 1, 2
    NEMA 4X
    000000000000000
     
    Stainless Steel
    1/2
    NPT
    Female3/4
    NPT
    FemaleScrew-On Cap with Retaining ChainDusty, Hazardous, Washdown, WetNEC Class I Divisions 1, 2 Groups A, B, C, D
    NEC Class II Divisions 1, 2 Groups E, F, G
    NEC Class III Divisions 1, 2
    NEC Zone 1 Groups IIC, IIB, IIA
    NEC Zone 21 Groups IIIC, IIIB, IIIA
    IEC Zone 1 Groups IIC, IIB, IIA
    IEC Zone 21 Groups IIIC, IIIB, IIIA
    AEx D IIC Gb
    AEx Tb IIIC Db
    Ex D IIC Gb
    Ex Tb IIIC Db
    ATEX II 2 GD Ex Db IIC Gb Ex Tb IIIC Db
    IECEx Ex Db IIC Gb
    IECEx Ex Tb IIIC Db
    IP66
    00000000000000
     

    Threaded RTD Probes with Thermowell for Liquids and Gas

    To protect against vibration and shock during temperature measurements, these RTD probes come with a thermowell. Made of stainless steel, it acts as a shield for added protection from corrosion in liquids and gases. The thermowell also lets you replace the probe sensor without stopping flow or draining your system. For accurate readings, a spring pushes the probe tip forward, keeping the tip in constant contact with the thermowell. Rated IP65 and NEMA 4, these probes seal out dust and water from washdowns. Remove the cap on the head to wire the probe’s terminal block to your application.
    Screw-Terminal Connection
    Image of Product. Front orientation. Contains Annotated. RTDs. Threaded RTD Probes with Thermowell for Liquids and Gas.
    Image of Product. Front orientation. Contains Annotated. RTDs. Threaded RTD Probes with Thermowell for Liquids and Gas.
    Probe
    Thermowell
    Connection
    Conduit
    Connection
    RTD Probe Resistance,
    ohm
    Temp. Range,
    ° F
    Lg.
    Dia.
    Accuracy
    Response
    Time, sec.
    Pipe
    Size
    Thread
    Type
    Gender
    Pipe
    Size
    Thread
    Type
    Gender
    Overall
    Lg.
    Fitting
    Material
    Each
    Spring Loaded 304 Stainless Steel Probe with Thermowell and Cast Iron Head (IP65, NEMA 4)
    100-55 to 4006"1/2"±0.12%303/4
    NPT
    Male3/4
    NPT
    Female14 1/8"Iron00000000000000
    100-55 to 4009"1/2"±0.12%303/4
    NPT
    Male3/4
    NPT
    Female17 1/8"Iron0000000000000
    100-55 to 40012"1/2"±0.12%303/4
    NPT
    Male3/4
    NPT
    Female20 1/8"Iron0000000000000
     

    Threaded RTD Probe Transmitters for Liquids and Gas

    Send temperature readings directly to programmable logic controllers (PLCs)—with a built-in 4-20mA transmitter, these RTDs don’t require a separate signal converter. They have an NPT male probe connection, so they’re ready to screw into thermowells and other fittings on pipe and tanks. Made of 316 or 316L stainless steel, they resist corroding from harsh cleaning chemicals. This stainless steel also protects the RTD sensor inside from impact. They are also often installed in bores to measure the temperature of molds and dies. CE marked, they meet European safety standards.
    Circular DIN Connection
    Image of Product. Side1 orientation. RTDs. Threaded RTD Probe Transmitters for Liquids and Gas, Circular DIN Connection.
    Fixed Probe—Fixed RTDs can be used directly in liquid or steam because they’re welded to their fitting for a liquid-tight seal.
    Probe
    RTD Probe Resistance,
    ohm
    Lg.
    Dia.
    Accuracy
    Response
    Time
    Probe Connection
    Pipe Size
    Voltage,
    V DC
    Max. Pressure,
    psi
    Output Current,
    mA
    Overall
    Lg.
    Fitting Material
    Choose a Temperature, ° F
    Each
    NPT Male Probe Connection—Fixed 316 Stainless Steel Probe with Plastic Head (IP65)
    1001 3/4"1/4"±0.5%Not Rated1/2
    10 to 307254 to 205 3/4"316 Stainless Steel
    -40 to 120
    ,
    0 to 250
    ,
    50 to 400
    0000000000000
    1003 1/4"1/4"±0.5%Not Rated1/2
    10 to 307254 to 207 1/4"316 Stainless Steel
    -40 to 120
    ,
    0 to 250
    ,
    50 to 400
    000000000000
    1005 1/4"1/4"±0.5%Not Rated1/2
    10 to 307254 to 209 1/4"316 Stainless Steel
    -40 to 120
    ,
    0 to 140
    ,
    50 to 400
    000000000000
    1008 1/4"1/4"±0.5%Not Rated1/2
    10 to 307254 to 2012 1/4"316 Stainless Steel
    -40 to 120
    ,
    0 to 200
    ,
    50 to 400
    000000000000
    10011 1/4"1/4"±0.5%Not Rated1/2
    10 to 307254 to 2015 1/4"316 Stainless Steel
    -40 to 120
    ,
    0 to 250
    ,
    50 to 400
    0000000000000
     
    4-Pole Micro M12 Plug-In Connection
    Image of Product. Front orientation. Contains Annotated. RTDs. Threaded RTD Probe Transmitters for Liquids and Gas, Micro M12 Connection.
    Fixed Probe—Fixed RTDs can be used directly in liquid or steam because they’re welded to their fitting for a liquid-tight seal.
    IO Link Communication Protocol—RTDs with IO Link let you remotely adjust settings, read measurements, and receive error messages when connected to a PLC via an IO Link controller (not included). These RTDs meet EN 60751 Class A standards for temperature accuracy. UL and C-UL listed, they meet American and Canadian safety standards.
    Probe
    RTD Probe Resistance,
    ohm
    Lg.
    Dia.
    Accuracy
    Response
    Time, sec.
    Probe Connection
    Pipe Size
    Voltage,
    V DC
    Max. Pressure,
    psi
    Output Current,
    mA
    Communication
    Protocol
    Overall
    Lg.
    Fitting Material
    Temp.,
    ° F
    Each
    NPT Male Probe Connection—Fixed 316L Stainless Steel Probe (IP67, IP68, IP69K)
    1,00011/16"1/4"±0.5%31/2
    18 to 325,8004 to 20IO Link4 1/8"316L Stainless Steel
    0 to 30000000000000000
    1,0001 1/2"1/4"±0.5%31/2
    18 to 324,3504 to 20IO Link5"316L Stainless Steel
    0 to 3000000000000000
    1,0003 1/2"1/4"±0.5%31/2
    18 to 324,3504 to 20IO Link7"316L Stainless Steel
    0 to 3000000000000000
    1,0005 7/16"1/4"±0.5%31/2
    18 to 324,3504 to 20IO Link8 7/8"316L Stainless Steel
    0 to 3000000000000000
     
    Cords

    RTD Probes for Liquids and Gas

    Image of Product. Front orientation. RTDs. RTD Probes for Liquids and Gas.
    Obtain more precise and reliable liquid and gas temperature measurements than thermocouple probes. Some of these probes meet DIN standards for accuracy, meaning they’re precise even with fast temperature changes.
    IP68 Enclosure Rating and IP69K Enclosure Rating—IP68- and IP69K-rated probes have plug-in connections that can handle brief submersion and harsh washdowns.
    Probe
    RTD Probe Resistance,
    ohm
    Temp. Range,
    ° F
    Lg.
    Dia.
    Accuracy
    Response
    Time, sec.
    Enclosure
    Rating
    Specs. Met
    Each
    4-Pin Micro M12 Plug-In Connection—316L Stainless Steel Probe
    100-40 to 3002"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A00000000000000
    100-40 to 3002 3/4"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 3003 7/8"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 3005 7/8"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 3006 1/4"3/8"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 3007 7/8"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 3009 7/8"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 30010 1/4"3/8"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 30013 3/4"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 30014 1/8"3/8"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    100-40 to 30022"3/8"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    1,000-40 to 3006 1/4"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    1,000-40 to 3006 1/4"3/8"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    1,000-40 to 30010 1/4"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    1,000-40 to 30010 1/4"3/8"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    1,000-40 to 30014 1/8"1/4"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    1,000-40 to 30014 1/8"3/8"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
    1,000-40 to 30022"3/8"±0.1%3IP68, IP69K
    EN 60751 Class A0000000000000
     
    Cords

    Sanitary RTD Probe Transmitters with Digital Display for Liquids and Gas

    Check the temperature of liquids in hygienic applications such as food or pharmaceutical lines and tanks. Certified by 3-A to meet sanitary design standards, the parts of these probes that will touch liquid are highly polished to minimize spots where bacteria could grow. They're made of stainless steel, so they won't corrode from harsh cleaners and sanitizers. The housing is IP69K rated, meaning it withstands high-pressure, high-temperature washdowns that are common in hygienic cleaning practices. They have a flange that will connect to sanitary quick clamp fittings (also known as tri-clamp fittings); they're easy to connect and remove from your line.
    Program these probes with the touchscreen, and select one of three colors as a visual alert for events in your process such as irregular or fluctuating temperatures. The head swivels 345° and the face rotates all the way around, so you can mount the sensor at any angle and still see the display. To trigger actions in your process line, connect these probes to remote displays, programmable logic controllers (PLCs), and other control equipment with the M12 plug. These probes meet EN 60751, an industry standard for accuracy. They’re also CE marked, meaning they meet European Union safety standards.
    5-Pole Micro M12 Plug-In Connection
    Image of Product. Front orientation. Contains Annotated. RTDs. Sanitary RTD Probe Transmitters with Digital Display for Liquids and Gas.
    Image of Attribute. Three-Color Display. Front orientation. ZoomedIn view. Contains MultipleImages. Multicolored Backlit Display. Sanitary RTD Probe Transmitters with Digital Display for Liquids and Gas.

    Three-Color Display

    RTDs
    Cords
    Probe
    RTD Probe Resistance,
    ohm
    Temp. Range,
    ° F
    Lg.
    Dia.
    Accuracy
    Response
    Time, sec.
    Flange
    OD
    Max. Pressure,
    psi
    Overall
    Lg.
    Specs. Met
    Voltage,
    V DC
    Output Current,
    mA
    Features
    Each
    Each
    316L Stainless Steel Probe with 304 Stainless Steel Head (IP69K)
     
    For 1 1/2" OD Tubes
    100-55 to 4802"5/16"±0.1%251.988"5806 3/4"EN 60751 Class B8 to 354 to 20Multicolored Backlit Display, Touchscreen000000000000000000000000000
     
    back to top