PR Electronics 3331 – Temperature Converter, Loop-Powered – Isolated

Features

  • Excellent accuracy, better than 0.05% of span
  • Slimline housing of 6 mm
  • Excellent EMC performance and 50/60 Hz noise suppression
  • Selectable < 30 ms / 300 ms response time
  • Pre-calibrated temperature ranges selectable via DIP-switches
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PR Electronics 3331 – Temperature Converter, Loop-Powered – Isolated

Application

  • PR Electronics 3331 temperature converter supports standard PT100, TC J, and K temperature sensors, offering an isolated passive analog current output.
  • It features high 2-port isolation for surge suppression, protecting against transients and noise, suitable for installation in safe areas or Zone 2 / Division 2 areas.
  • Approved for marine use.

Technical Specifications

  • Operates flexibly on 5.5 to 35 VDC via connectors, powered by the loop.
  • Provides fast response (< 30 ms) with optional simultaneous sensor error detection.
  • Offers selectable 300 ms response time for signal damping.
  • Allows internal/external CJC selection.
  • Ensures excellent conversion accuracy (< 0.05% of span) across all ranges.
  • Meets NAMUR NE21 recommendations for top measurement performance in challenging EMC environments.
  • Complies with NAMUR NE43 for defining out-of-range and sensor error output values.
  • All terminals are safeguarded against overvoltage and polarity errors.
  • Provides high galvanic isolation (2.5 kVAC) and a signal/noise ratio of > 60 dB.

Mounting / Installation / Programming

  • Features selectable DIP settings for convenient configuration of over 1000 factory-calibrated measurement ranges.
  • The compact 6 mm housing allows dense mounting (up to 165 units per meter of DIN rail) without air gaps between units.
  • Operates effectively within a wide ambient temperature range (-25 to +70°C).

Specification

ENVIRONMENTAL CONDITIONS
Operating temperature -25°C to +70°C
Storage temperature -40°C to +85°C
Calibration temperature 20…28°C
Relative humidity < 95% RH (non-cond.)
Protection degree IP20
Installation in Pollution degree 2 & meas. / overvoltage cat. II
MECHANICAL SPECIFICATIONS
Dimensions (HxWxD) 113 x 6.1 x 115 mm
Weight approx. 70 g
DIN rail type DIN EN 60715/35 mm
Wire size 0.13…2.5 mm2 / AWG 26…12 stranded wire
Screw terminal torque 0.5 Nm
Vibration IEC 60068-2-6
2…25 Hz ±1.6 mm
25…100 Hz ±4 g
COMMON SPECIFICATIONS
Supply
Supply voltage 5.5…35 VDC
Max. required power 0.80 W
Internal power dissipation 19 mW…0.8 W
Isolation voltage
Isolation voltage, test / working 2.5 kVAC / 300 VAC (reinforced)
Zone 2 / Div. 2 250 VAC
Response time
Response time (0…90%, 100…10%) < 30 ms / 300 ms (selectable)
Voltage drop 5.5 VDC
Signal / noise ratio Min. 60 dB
Programming DIP-switches
Signal dynamics, input 23 bit
Signal dynamics, output 18 bit
EMC immunity influence < ±0.5% of span
Extended EMC immunity: NAMUR NE21, A criterion, burst < ±1% of span
Incorrect DIP-switch setting identification 3.5 mA
INPUT SPECIFICATIONS
RTD input
Temperature range, Pt100 -200…+850°C
Min. measurement range (span) 10°C
Accuracy: the greater of Better than 0.05% of span or 0.1°C
Temperature coefficient: the greater of 0.02°C/°C or ≤ ±0.01%/°C
Sensor current < 150 µA
Sensor cable resistance < 50 Ω per wire
Effect of sensor cable resistance (3-/4-wire) < 0.002 Ω / Ω
Sensor error detection Yes – selectable via DIP-switch
Broken sensor detection > 800 Ω
Shorted sensor detection < 18 Ω
TC input
Temperature range, TC J -100…+1200°C
Temperature range, TC K -180…+1372°C
Min. measurement range (span) – TC J & K 50°C
Accuracy: the greater of Better than 0.05% of span or 0.5°C
Temperature coefficient: the greater of 0.1°C/°C or ≤ ±0.01%/°C
Sensor cable resistance < 5 kΩ per wire
Cold junction compensation (CJC): Accuracy @ external Pt100 input Better than ±0.15°C
Cold junction compensation (CJC): Accuracy @ internal CJC Better than ±2.5°C
Internal CJC error detection Yes
External CJC error detection Yes – selectable via DIP-switch
Open Thermocouple detection Yes – selectable via DIP-switch
OUTPUT SPECIFICATIONS
Common output specifications
Updating time 10 ms
Current output
Programmable signal ranges 4…20 and 20…4 mA
Load (@ current output) ≤ (Vsupply – 5.5) / 0.023 [Ω]
Load stability ≤ 0.01% of span / 100 Ω
Sensor error indication 3.5 mA or 23 mA / acc. to NAMUR NE43 or OFF
I.S. / EX MARKING
ATEX II 3 G Ex nA IIC T4 Gc
IECEx Ex nA IIC T4 Gc
FM, US Cl. I, Div. 2, Gp. A, B, C, D T4 or Cl. I, Zone 2, AEx nA IIC T4
FM, CA Cl. I, Div. 2, Gp. A, B, C, D T4 or Cl. I, Zone 2, Ex nA IIC T4
EAC Ex 2Ex nA IIC T4 Gc X
OBSERVED AUTHORITY REQUIREMENTS
EMC 2014/30/EU
LVD 2014/35/EU
RoHS 2011/65/EU
EAC TR-CU 020/2011
EAC Ex TR-CU 012/2011
APPROVALS
ATEX KEMA 10ATEX0147 X
IECEx KEM 10.0068X
c FM us FM17US0004X / FM17CA0003X
UL UL 61010-1
DNV-GL Marine TAA00001RW
EAC Ex RU C-DK.HA65.B.00355/19

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PR Electronic 3331 Temperature converter, loop-powered – isolated-DpstarGroup

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