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ExTempMini – Miniature Intrinsically Safe Infrared Temperature Sensor for High Ambient Temperatures

ExTempMini – Miniature Intrinsically Safe Infrared Temperature Sensor for High Ambient Temperatures


  • Temperature range: -20°C to 1000°C
  • Sensing head for use in ambient temperatures up to 180°C
  • ATEX, IECEx and UKEX certified up to Zone 0 (gas)
  • JapanEx certified
  • 4-20 mA output, two-wire, loop-powered
  • Optional RS-485 network adapter and USB configuration tool
  • Supplied with 5 m, 10 m or 25 m sensing head cable
  • Stainless steel 316 housing, ideal for offshore applications
  • Not designed or approved for fever detection

Brand : Calex


Hazardous Area Classification:

Area Temperature Rating (Ta) Range ATEX Classification IECEx Classification (Gas)
Main Enclosure -20°C ≤ Ta ≤ 70°C Ex II 2 G Ex ia [ia Ga] IIC T4 Gb
Sensing Head (ambient temperatures below 115°C) -20°C ≤ Ta ≤ 115°C Ex II 1 G Ex ia IIC T4 Ga
Sensing Head (ambient temperatures below 180°C) -20°C ≤ Ta ≤ 180°C Ex II 1 G Ex ia IIC T3 Ga
Maximum DC Input Voltage Ui = 28 V
Maximum Input Current Ii = 93 mA
Maximum Input Power Pi = 0.651 W
Maximum Internal Capacitance Ci = 5.17 nF
Maximum Internal Inductance Li = 1.99 µH
ATEX Certificate Number CML 22ATEX2007X
IECEx Certificate Number IECEx CML 22.0001X
JapanEx Certificate Number CML 22JPN2009X
UKCA Certificate Number CML 22UKEX2008X

General Specifications:

Specification Value
Measurement Temperature Range -20°C to 1000°C (see table of Model Numbers)
Output Two-wire 4 to 20 mA (loop powered)
Maximum Temperature Span 1000°C
Minimum Temperature Span 100°C
Accuracy ± 1°C or 1%, whichever is greater
Repeatability ± 0.5°C or 0.5%, whichever is greater
Emissivity Setting Range 0.20 to 1.00 (pre-set to 0.95)
Emissivity Setting Method User configurable via optional USB / RS-485 adapters
Response Time, t90 240 ms (90% response)
Spectral Range 8 to 14 μm
Supply Voltage 12 to 24 V DC ± 5%
Minimum Sensor Voltage 11.4 V DC
Maximum Current Draw 25 mA

Field of View Diagrams

Note: The given measured spot size contains 90% of the energy detected by the sensor. We normally recommend the target is at least twice as large as the given measured spot for maximum accuracy. Sensors may be used at longer distances than the above diagrams show. There is no maximum measurement distance in clean air; this is because the ExTempMini detects only the wavelengths of infrared radiation that are not absorbed by the atmosphere.

Mechanical Specifications:

Specification Value
Construction Main Enclosure: Painted Aluminium
Sensing Head: Stainless Steel 316
Major Dimensions Main Enclosure: 99 x 65 x 35 mm
Sensing Head: Ø 20 x length 69 mm including cable gland (see Dimensions)
Mounting Main Enclosure: 2 x mounting holes, use M4 socket head screws
Sensing Head: M20 x 1.5 mm thread, length 20 mm, supplied with two mounting nuts
Cable Length (Sensing Head) Choice of 5 m, 10 m, or 25 m factory-fitted. Contact Calex for information about extending cable.
Weight with Cable 475 g (5 m cable), 625 g (10 m cable), 1075 g (25 m cable)
Cable Connections Removable screw terminal blocks (see Connections). Conductor size 22 AWG to 14 AWG (0.326 mm2 to 2.08 mm2)
Output Cable Gland Suitable for cable diameters 3.5 to 7.0 mm

Environmental Specifications:

Specification Value
Environmental Rating Main Enclosure and Sensing Head: IP65 (NEMA 4)
Ambient (Operating) Temperature Range Main Enclosure: 0°C to 70°C
Sensing Head: 0°C to 180°C
Ambient Pressure Range Main Enclosure and Sensing Head: 80 kPa (0.8 bar) to 110 kPa (1.1 bar)
Relative Humidity Main Enclosure and Sensing Head: Max. 95% non-condensing
CE Marked Yes
RoHS Compliant Yes

Data Sheet