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3331
 
 

3331

 

Temperature converter, loop-powered - isolated

 

  • 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
  1. Overview +

  2. Technical details +

  3. Accessories +


Application

  • 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

  • Flexibly 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.

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 x 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

Observed authority requirements

  • EMC

    2014/30/EU

  • LVD

    2014/35/EU

  • RoHS

    2011/65/EU

  • EAC

    TR-CU 020/2011

Approvals

  • ATEX 2014/34/EU

    KEMA 10ATEX0147 X

  • IECEx

    KEM 10.0068X

  • FM

    FM17US0004X / FM17CA0003X

  • DNV-GL Marine

    Stand. f. Certific. No. 2.4

  • UL

    UL 61010-1

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