IMPAC Pyrometer
IPE 140/39

Special version of IPE 140 with a spectral range of 3.9 µm for non-contact temperature measurement through flames and combustion gas as well as penetrating measurement into glass. Temperature ranges between 20 to 1800 °C.

IMPAC Pyrometer IPE 140/39

Key Features

  • 3 temperature ranges between 20 to 1800 °C
  • Measurement through flames and combustion gas without influencing the measurement 
  • Penetrating measurement into glass
  • Reduction of emissivity errors


The IPE 140/39 is a special pyrometer for non-contact temperature measurement of metal parts in flame heated furnaces. Like the basic IPE 140, the IPE 140/39 is a highly accurate digital pyrometer.

The narrow spectral range of 3.9 µm avoids the influence of humidity and CO2 and enables a correct measurement through flames and combustion gases. Also humidity and CO2 do not have any influence on measurements with long measuring distances.

Another application is the measurement of glass if a small penetration into the glass is necessary (e.g. glass drop). Measurement errors caused by partially cooled down surfaces can be avoided.

For optimal match of the instrument to the application 3 different focusable optics with extremely small spot sizes are available.


Technical Data

Temperature ranges:

MB 7: 20 ... 700 °C     

MB 12: 75 ... 1200 °C      

MB 14.5S: 300 ... 1450 °C      

MB 18: 200 ... 1800 °C      

Subrange: any range adjustable within the temperature range, minimum span 51 °C

Spectral ranges:

3.9 µm

Signal processing: photoelectric current, digitized immediately


(ε = 1, t90 = 1 s, Tamb. = 23°C)

MB 3.5:
below 250 °C: 1 °C
above 250 °C: 0.4% of reading in °C +1°C

All others:
below 400 °C: 2.5°C
above 400 °C: 0.4% of reading in °C +1°C


MB 3.5:
0.1% of reading in °C + 0.2°C

All others:
0.1% of reading in °C + 1°C 

Resolution: interface and display: 0.1°C, analog output: < 0.03 % of temperature range
Exposure time t90: 1.5 ms, with dynamical adaption at low signal levels; adjustable up to 10 s
Emissivity ε: 10 to 100% adjustable in steps of 0.1%
Analog output: linear 0 to 20 mA or 4 to 20 mA, DC, switchable; load max. 500 Ohm
Test current output: fixed 10 mA (for 0 to 20 mA analog output) or fixed 12 mA (for 4 to 20 mA analog output)
Power supply: 24 V AC/DC (12 to 30 V AC/DC) (AC: 48 to 62 Hz)
Power consumption: max. 6 VA
Serial interface: switchable inside the pyrometer: RS232 or RS485 addressable, half duplex; baud rate up to 115 kBd
Parameters: adjustable at the instrument or via serial interface: emissivity; response time; analog output; address; baud rate; waiting period tW; temperature unit °C or °F; setting of the maximum value storage; temperature sub range
Maximum value storage: single or double storage; cleared by: preselected time interval; external deletion contact or via digital interface; automatically with the next measuring object
Isolation: power supply, digital interface, analog output are galvanically isolated against each other and housing
Protection class: IP65 (DIN 40 050)  
Sighting: laser targeting light (max. power level < 1 mW, λ = 630-680 nm, CDRH class II) or thru-lens view finder
Ambient temperature: 0 to 53°C at housing
Storage temperature: -20 to 60°C
Weight:  approx. 550 g
Dimensions [mm]: 195 x 56 x 62.5 (l x W x D)
Mechanical tests: vibration proof corresponding DIN EN 60068-2-6, shock proof corresponding DIN EN 60068-2-27
Relative humidity: Non condensing conditions
CE-label: according to EU directives about electromagnetic immunity




IMPAC Pyrometer IPE 140/39
MB 7 Foc. Optics 1-PE a=105...150 mm
MB 7 Foc. Optics 2-PE a=200...440 mm
MB 7 Foc. Optics 3-PE a=345...4300 mm
MB 12 Foc. Optics 1-PE a=105...120 mm
MB 12 Foc. Optics 2-PE a=200...440 mm
MB 12 Foc. Optics 3-PE a=345...4300 mm
MB 14.5S Foc. Optics 1-PE a=105...150 mm
MB 14.5S Foc. Optics 2-PE a=200...440 mm
MB 14.5S Foc. Optics 3-PE a=345...4300 mm

Display of optical path:

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