loop-powered Temperature Converter

Model : PR 3331

Brand: PR Electronics

  • RTD Pt100 input
  • Thermocouple (TC) input type J, K
  • Current output ranges: 4…20 and 20…4 mA
  • Excellent accuracy, better than 0.05% of span
  • Only 6.1mm width
  • Excellent EMC performance and 50/60 Hz noise suppression
  • 5kVAC galvanic isolation
  • Selectable fast response time (< 30ms / 300ms)
  • Configuration via DIP-switches and selectable calibrated temperature ranges

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PR Electronics

Number of Inputs


Input Type

RTD, Thermocouple

Number of Outputs


Output Type

DC Current


DIP switch


< ±0.05% of span


ATEX, Zone2, DNV, EAC, FM, Zone2 – DIV2, IECEx, Zone2, UL 61010

Power Supply

Input loop-powered


2.5 kVAC

Operating Temperature

-25 to +70°C

Temperature Coefficient

< ±0.01% of span /°C

Protection Degree

IP 20


113x 6.1×115 mm



Other product features

70 g


175 × 150 × 15 mm


  • The 3331 temperature converter measures a standard Pt100, TC J, and K temperature sensor and provides an isolated passive analog current output signal.
  • High 2 port isolation provides surge suppression and protects the control system from transients and noise.
  • The 3331 can be mounted in the safe area or in Zone 2 / Division 2 areas.
  • Approved for marine applications.

Technical characteristics

  • Flexible loop powered by 5.5…35 VDC via connectors.
  • < 30 ms fast response time with simultaneous sensor error detection when selected.
  • Selectable 300 ms response time when signal dampening is needed.
  • Selectable internal/external CJC.
  • Excellent conversion accuracy in all available ranges, better than 0.05% of span.
  • Meeting the NAMUR NE21 recommendations, the 3331 provides top measurement performance in harsh EMC environments.
  • The device meets the NAMUR NE43 standard defining out-of-range and sensor error output values.
  • All terminals are protected against overvoltage and polarity error.
  • High galvanic isolation of 2.5 kVAC.
  • Excellent signal/noise ratio of > 60 dB.

Mounting / installation / programming

  • Selectable DIP settings for easy configuration of more than 1000 factory-calibrated measurement ranges.
  • The narrow 6 mm housing allows up to 165 units to be mounted per meter of DIN rail without any air gap between units.
  • Wide ambient temperature range of -25…+70°C.

Source: PR3331 Official Page

Product Documents:


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