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3-A Approved Sanitary RTD Sensors with Polypropylene or Stainless Steel Connection Heads

PRS-NB9W Sanitary RTD Sensors

3-A Approved Direct Immersion Sanitary RTD Sensors Pt100 with Connection Heads for use in Food, Dairy, Beverage and BioPharmaceutical Processes | PRS-NB9W Sanitary RTD Sensors

See All Models Below

  • 3-A Approved Design, Along with ASME-BPE-2007 Flange Geometry, Insures Trouble-Free Cleanability and Interchangeability
  • Can Be Used in Sanitary, Hygienic and Clean-In-Place Food, Dairy, Beverage and BioPharmaceutical Processes
  • Wetted Surfaces are 316L Stainless Steel, Surface Finish = 32 Microinch or Better
  • Standard Duty ¼" (0.250") Diameter or
    Heavy Duty Stepped 38" to 316" Diameter Probes Available
  • 4-Wire, Pt100, Class A Platinum RTD Sensor (100.00 ±0.06 Ω at 0°C) Standard
  • Process Measurement Temperature Range: -50 to 200°C (-58 to 392°F)
  • Compatible with 3-Wire and 2-Wire RTD Instruments & Transmitters
Sanitary - View related products


Sanitary Sensor Specifications Include:
  • 316L stainless steel process wetted surfaces with surface finishes of 32 microinches or better.

  • Probe lengths of 3, 4, 5 or 6 inches available from stock, other lengths available as special orders.

  • Sensor Output is a 4-wire, 100 ohm, Class A, Platinum RTD meeting the requirements of IEC 60751.

  • These sensors can also be used with 2-wire or 3-wire systems see information below.

  • Insulation resistance: 100 megohms minimum at 100 VDC.

  • Thermal response time of less than 2.5 seconds in water flowing at 3 ft/sec (63% response).

  • Optional stainless steel connection heads available.

  • 3-A approved The 3-A Approved OMEGA® PRS-S-NB9W and PRS-H-NB9W Series RTD Sensors are designed for use in Sanitary or Hygienic Clean-in-Place applications in the Food, Dairy, Beverage and BioPharmaceutical industries. These sensors are manufactured with 316L stainless steel housings that meet the dimensional and finish requirements of 3-A Standard 74-05 and ASME BPE-2007, and are welded and processed to provide a clean, smooth, 32 microinch or better surface finish in the wetted areas for Clean-in-Place processes.

    The probe stems are manufactured in two configurations; with a standard ¼" diameter probe for standard duty service, and a stepped 3/8" to 3/16" diameter probe design for good response times in heavy duty applications. A white polypropylene connection head provides a convenient 3/4" NPT threaded connection point for process wiring.

    Food process hygienic temperature sensors can be used to aid food safety inspection compliance and verification of time temperature control. Combined with a chart recorder model CTXL you can temperature monitor a CCP ( Critical Control Point) or sanitation time and move toward a HACCP (Hazard Analysis Critical Control Point) compliance plan.

    In addition to the standard 1½-16AMP process connection, these can be provided in the following sizes and styles:
    Process ConnectionModel Number Code
    1" and 1½"-16AMP-D1-

    If you need a process connection that is not listed above, please contact our sales department for availability.

    These sensors are supplied standard as 4-wire assemblies with two red wires and two white wires. When used in 3-wire applications simply connect to three of the wires (typically two red and one white). When used in 2-wire applications, connect to one of the red wires and one of the white wires.

    These sensors are also available with Thermistor and Thermocouple sensors to accommodate any process input requirement.
    Place Order(Specify Model Number)
    Part Number/ Desc.
    Straight Sheathed ¼" Diameter, Standard Duty Probe Assemblies
    PRS-3-100-A-S-0300-D1-NB9W Star
    Availability: In Stock
    3" long standard duty probe
    PRS-3-100-A-S-0400-D1-NB9W Star
    Availability: 3 weeks
    4" long standard duty probe
    PRS-3-100-A-S-0500-D1-NB9W Star
    Availability: 2 weeks
    5" long standard duty probe
    PRS-3-100-A-S-0600-D1-NB9W Star
    Availability: 2 weeks
    6" long standard duty probe
    Stepped 38" Diameter to 316" Diameter Sheath, Heavy Duty Probe Assemblies
    PRS-3-100-A-H-0300-D1-NB9W Star
    Availability: 1 week
    3" long heavy duty probe
    PRS-3-100-A-H-0400-D1-NB9W Star
    Availability: 2 weeks
    4" long heavy duty probe
    PRS-3-100-A-H-0500-D1-NB9W Star
    Availability: 2 weeks
    5" long heavy duty probe
    PRS-3-100-A-H-0600-D1-NB9W Star
    Availability: 2 weeks
    6" long heavy duty probe

    Order By Part Number

    Part Number
    Part Number

    All dollar amounts on this site are shown in Canadian currency. Note:
  • For a 3-A Approved stainless steel connection head, change "NB9W" to "NB15" in model number and add $37 to the price. For a medium sized stainless steel connection head, change "NB9W" to "NB13" in model number and add $55 to the price. For a white polypropylene flip top connection head, change "NB9W" to "NB16W" in model number and add $7 to the price.

  • For longer probe lengths on Standard Duty construction, change length in model number to required length in inches and add $1 per inch to the price (up to 24 inches).
  • For Heavy Duty construction, change length in the model number to the required length in inches and add $2.50 per inch to the price (up to 24 inches).
  • For other than the standard 1½-16AMP process connection, change "-D1-" in the model number to the code for the alternate process connection option listed above the "To Order" table and add $20 to the price
  • For lengths over 24 inches,or for other cap sizes and styles, please contact Sales.

  • Ordering Example: (1) PRS-3-100-A-S-0400-D1-NB9W Sanitary RTD with 1½, CAD131.00

    Part Number Builder

    Build Your Part Number Below
    Option Descriptions:

    (1) Nominal Element Resistance select from:
    100 for 100 ohm @ 0 C (standard)
    1000 for 1 kohm @ 0 C

    (2) Accuracy Class select from:
    A for Class A Accuracy

    (3) Probe Diameter select from:
    S for Standard Duty 1/4 inch
    H for Heavy Duty 3/8 to 3/16 inch stepped probe

    (4) Probe Length select from:
    0300 for 3 inch length
    0400 for 4 inch length
    0500 for 5 inch length
    0600 for 6 inch length

    (5) Sanitary Flange (Cap) Size select from:
    D1 for 1-1/2 inch Tri-Grip Flange (standard)
    B1 for 3/4 inch 16AMP Tri-Grip Flange
    E1 for 2 inch 16AMP Tri-Grip Flange
    F1 for 2-1/2 inch 16AMP Tri-Grip Flange
    G1 for 3 inch 16AMP Tri-Grip Flange
    H1 for 4 inch 16AMP Tri-Grip Flange

    (6) Protection Head select from:
    NB9W for White Polypropylene Head with Screw Cap (Standard)
    NB15 for Large Stainless Steel Head
    NB13 for Medium Stainless Steel Head (not 3A approved)
    NB16W for White Polypropylene Head with Flip Top (not 3A approved)
    Note: All combinations may not be valid, check spec sheet for valid part numbers.