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The REOTEMP Model W Explosion Proof Field Mounted HART Temperature Transmitter features a local display, HART compatibility, and a 4-20mA output. The field mounted transmitter is available as a complete RTD or thermocouple assembly customized to your process.

Key Features

  • RTD or TC input, analog output
  • High definition local operator interface (LOI) with 3 optical buttons
  • Selectable red or white backlight
  • Ex d explosion proof / flame proof aluminum head
  • HART 7 functionality with HART 5 compatibility

High Definition Display

  • 0, 90, 180, & 270 degree position adjustments
  • Monitoring, programming and diagnostics view
  • Extensive diagnostics with flashing red or white backlight

Local Operator Interface (LOI)

  • 3 optical buttons; up, down and enter
  • Dynamically adaptive to wear or accumulation of dirt
  • Immune to interference from ambient light sources
  • Useable with or without gloves


  • From the LOI through guided menu
  • PReset and HART modem
  • HHC, DCS or AMS via HART

Mounting / Installation

  • For installation in zone 0, 1, 2 and zone 20, 21, 22 and in Class 1, Division 1 and 2 applications
  • Hardware assessed for use in SIL 2 applications
  • Mounting on 1.5”–2” pipe bracket or on wall / bulkhead


  • Linearized temperature measurement with TC and RTD sensors e.g. Pt100 and Ni100
  • HART communication and 4…20 mA analog PV output for individual, difference or average temperature measurement of up to two RTD or TC input sensors
  • Up to 63 transmitters (HART 7) can be connected in a multidrop communication setup

Technical Characteristics

  • NAMUR NE43 and NE89
  • HART protocol revision can be changed by user configuration to either HART 5 or HART 7 protocol
Environmental Conditions
Operating Temperature -40°C to +85°C
Storage Temperature -40°C to +85°C
Calibration Temperature  20…28°C
Relative humidity  0…100% RH (condensing)
Protection degree  IP54 / IP66 / IP68 / type 4X
Mechanical Specifications
Dimensions Ø 110 mm
Dimensions (HxWxD), aluminum 109.3 x 145 x 126 mm
Weight approx. 1.3kg
Wire size 0.13 x1.5 mm2 / AWG 26…16 stranded wire
Screw terminal torque 0.4 Nm
Vibration IEC 60068-2-6
  2…25 Hz ±1.6 g
  25…100 Hz ±4 g
Number of digits 5
Backlight Selectable ON/OFF
Backlight color Selectable white or red
Common Specifications
Supply voltage, DC: Ex ia, intrinsically safe 10 (12 – with backlight)…30 VDC
Supply voltage, DC: Other 10 (12 – with backlight)…35 VDC
Isolation voltage, test / working 1.5 kVAC / 50 VAC
Response time (programmable) 1…60 s
Signal / noise ratio > 60 dB
Programming HART
Start-up time, transmitter to display Max. 5 s
Long-term stability, better than ±0.1% of span / year
Transmitter Accuracy Better than 0.05% of selected range
Signal dynamics, input 22 bit
Signal dynamics, output. 16 bit
EMC immunity influence < ±0.1% of span
Extended EMC immunity: NAMUR NE21, A criterion, burst < ±1% of span
Max. offset. 50% of selected max. value
Input Specifications
RTD type Pt50/100/200/500/1000; Ni50/100/120/1000
Cable resistance per wire 5 Ω (up to 50 Ω per wire is possible with reduced measurement accuracy)
Sensor current Nom. 0.2 mA
Thermocouple type B, E, J, K, N, R, S, T
Cold junction compensation (CJC) Constant, internal or external via a Pt100 or Ni100 sensor
Output Specifications
Signal range 4…20 mA
Min. signal range 16 mA
Load (@ current output) ≤ (Vsupply – 10) / 0.023 [Ω]
Load resistance, with backlight ≤ (Vsupply – 12) / 0.023 [Ω]
Sensor error indication Programmable 3.5…23 mA
NAMUR NE43 Upscale/Downscale 23 mA / 3.5 mA
Updating time 440 ms
HART protocol revisions HART 7 and HART 5
Observed Authority Requirements
EMC 2014/30/EU
EAC TR-CU 020/2011
EU RO Mutual Recognition Type Approval MRA0000009
ATEX 2014/34/EU DEKRA 15 ATEX 0058 X
IECEx IECEx DEK 15.0039 X
FM FM16US0009X / FM16CA0010X
CSA 70024231
EAC Ex TR-CU 012/2011 RU C-DK.GB08.V.01316
NEPSI GYJ15.1336X, GYJ15.1337X and GYJ15.1338X
SIL Hardware assessed for use in SIL applications

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