PR Electronics 3337 – HART 7 Temperature Converter, Loop-Powered

Features

  • High accuracy, better than 0.05% of span
  • Slimline housing of 6 mm
  • Excellent EMC performance
  • Selectable 60 ms / 60 s response time
  • Pre-calibrated temperature ranges selectable via DIP-switches
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PR Electronics 3337 – HART 7 Temperature Converter, Loop-Powered

Application

  • PR Electronics 3337 temperature converter supports standard Pt100, TC J, and K temperature sensors, offering isolated passive analog current and HART signal outputs.
  • High 2-port isolation ensures surge suppression, protecting the control system from transients and noise.
  • PR Electronics 3337 can be installed in safe areas or Zone 2 / Division 2 environments.
  • Approved for marine applications.

Technical Specifications

  • Flexibly loop-powered by 6.2 to 35 VDC via connectors.
  • Fast response time of 60 ms with simultaneous sensor error detection option.
  • Internal/external Cold Junction Compensation (CJC) selectable.
  • Excellent conversion accuracy across all ranges, exceeding 0.05% of span.
  • Compliant with NAMUR NE21 recommendations, delivering high measurement performance in challenging EMC conditions.
  • Conforms to NAMUR NE43 standard for defining out-of-range and sensor error outputs.
  • Terminals protected against overvoltage and polarity errors.
  • High galvanic isolation of 2.5 kVAC.
  • Signal-to-noise ratio exceeds 60 dB.

Mounting / Installation / Programming

  • Selectable HART mode with HART 7 revision protocol for advanced device programming.
  • DIP-mode available for easy configuration of over 1000 factory-calibrated measurement ranges with HART read-only capability.
  • Compact 6 mm housing allows up to 165 units per meter of DIN rail without gaps.
  • Wide ambient temperature range from -25°C 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 6.2…35 VDC
Max. required power 0.80 W
Internal power dissipation 22 mW…0.8 W
Isolation voltage
Isolation voltage, test / working 2.5 kVAC / 300 VAC (reinforced)
Zone 2 / Div. 2 250 VAC
Response time
HART mode, (0…90%, 100…10%) 60 ms…60 s, programmable
DIP mode, (0…90%, 100…10%) < 60 ms
Voltage drop 6.2 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
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
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 – 6.2) / 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
HART protocol revisions HART 7
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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