The PR Series RTDs are sensors whose electrical resistance changes with a change in temperature. They measure temperatures from -200 to +650°C (-320 to +1200°F) and are calibrated to either ASTM (IEC, DIN) or SAMA standard curves. The resistance output from the element may be directly connected to a variety of resistance temperature measurement instruments.

• Functional Specifications:
  • Temperature Limits:
    • The maximum temperature limit is determined by the lowest upper range limit (URL) of the element, connection head, or sheath.
  • Element:
    • -200 and +650°C (-330 and +1200°F)
  • Connection Head:
    • -40 and +105°C (-40 and +220°F)
  • 316 ss Sheath:
    • -200 and +480°C (-320 and +900°F)
  • Inconel Sheath:
    • -200 and +650°C (-320 and +1200°F)
  • ASTM Calibration:
    • Per ASTM E1137-87. Resistance at 0°C (32°F) is as follows (also conform to DIN and IEC calibrations):
      • for ASTM-B, 100.00 ± 0.10 _
      • for ASTM-A, 100.00 ± 0.05 _
    • Refer to Technical Information Sheet TI 005-028. Alpha is 0.00385 _/_/°C.
  • SAMA Calibration:
    • SAMA Standard RC 21-4-1966. Curves PR 279 (°C) and PR 278 (°F). Alpha is 0.003923 _/_/°C. Resistance of 98.129 ±0.1 _ at 0°C (32°F). Refer to TI 5-27a.
  • External Pressure:
    • The detector sheath can be exposed to an external pressure of 21 MPa (3000 psi, 210 bar or kg/cm2)
      without a change in resistance of more than the amount equivalent to 0.05°C (0.1°F). There will be no permanent change in the resistance at the ice point after this exposure.
  • Vibration:
    • A detector, with 76 mm (3 in) of its sheathed length unsupported or overhanging, will withstand 250 m/s2 (25 “g”)
      vibration from 20 to 2000 Hz in any axis for 25 minutes without damage..