IMPAC Pyrometer
IGA 140/23

Pyrometer with focusable optics for non-contact temperature measurements on metals, ceramics, graphite etc. between 50 and 1800 °C

IMPAC Pyrometer IGA 140/23 (different optics)
IMPAC Pyrometer IGA 140/23
IMPAC Pyrometer IGA 140/23  (Front)
IMPAC Pyrometer IGA 140/23 With Laser Targeting Light
IMPAC Pyrometer IGA 140/23 With Laser Targeting Light (Back)
IMPAC Pyrometer IGA 140/23 With Through Lens View Finder
IMPAC Pyrometer IGA 140/23 With Through Lens View Finder (Side)

Key Features

  • Temperature ranges between 50 and 1800 °C
  • Short response times < 1.5 ms
  • Very small spot sizes, min 0.5 mm
  • Built in digital display
  • Parameter adjustments via integrated key pad or interface
  • Optimized thru-lens view finder or laser targeting light
  • Test current output
  • Housing with precision mounting rail for safe mounting and accurate alignment
  • Interface RS232 / RS485 switchable
  • Focusable optics


The pyrometer IGA 140/23 is a digital, highly accurate pyrometers for non-contact temperature measurement on metals, ceramics, graphite etc.

The pyrometer are equipped with RS232 and RS485 serial interfaces (switchable inside the pyrometer). This enables additionally the reading of temperature and pyrometer parameters via the provided InfraWin PC-software. If necessary the parameters can be changed via PC.

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

The pyrometer parameters can be selected via the integrated key pad, the settings are indicated on the built-in LC-Display. In measuring mode the actual temperature is indicated.

A laser targeting light or a thrulens view finder for exact alignment of the pyrometer is available.

Typical Applications

  • Preheating
  • Annealing
  • Tempering
  • Welding
  • Forging
  • Hardening
  • Sintering
  • Melting
  • Soldering
  • Rolling
  • Brazing
  • Normalizing


Technical Specifications

Measurement Specifications
Temperature Range:

MB 7:    50 to 700 °C 

MB 9:    75 to 900 °C 

MB 13:  100 to 1300 °C 

MB 18:  150 to 1800 °C 

Sub Range: Any range adjustable within the temperature range, minimum span 51 °C
Spectral Ranges 2.0 to 2.6 µm
IR Detector: Indium Gallium Arsenide photodiode (extended InGaAs)
Signal processing: Photoelectric current, digitized immediately

Measurement Uncertainty:

(ε = 1, t90 = 1 s, Tamb. = 23 °C)

Up to 400 °C: 2 °C

400 to 1500 °C: 0.3% of reading in °C + 2 °C

Above 1500 °C: 0.5% of reading in °C


(ε = 1, t90 = 1 s, Tamb. = 23 °C)

0.1% of reading in °C + 1 °C
Resolution: 0.1 °C on interface and display; 16 bit D/A converter for analog output
Emissivity ε: 10.0 to 100.0% adjustable via interface in steps of 0.1%
Sighting:  Laser targeting  light (max. power level < 1 mW, λ =  630-680 nm, CDRH  class II) or thru-lens view finder
Operation signal: Green LED
LC display: Illuminated LC display for temperature indication or parameter settings 

Adjustable at the device  or via interface: Emissivity, Transmittance τ, exposure time t90, 0 to 20 or 4 to 20 mA, sub range, clear times for maximum value storage, automatically or external deletion of maximum value storage, address, baud rate, wait time tW

Readable at the device or via interface: Measuring temperature, internal instrument temperature.

Analog Output: 0 to 20 mA or 4 to 20 mA (linear), switchable; Test current 10 mA or 12 mA by pressing test key
Digital Interface: RS232 or RS485 addressable (half duplex), switchable; Baud rate 1200 up to 115200 Bd Alternatively: Profibus, Profinet, or Ethernet
Exposure Time t90: < 1.5 ms;  with dynamical adaption at low signal levels
Maximum Value Storage: Built-in single or double storage. Clearing with adjusted time tclear  (off; 0.01 s; 0.05 s; 0.25 s; 1 s; 5 s; 25 s), extern, via interface or automatically with the next measuring object
Power Supply: 24 V AC/DC (12 to 30 V AC/DC)  (AC: 48 to 62 Hz) 
Power Consumption: max. 7.5 W
Load:  0 ... 500 Ω 
Switch Contact: Max. 0.15 A (only active with automatic clear mode or tCL ≥ 0.25 s) 
Isolation: Power supply, digital interface, analog output are galvanically isolated against each other and housing
Environmental Specifications 
Protection Class: IP65 (DIN 40 050)
Ambient Temperature: 0 to 70 °C  at housing
Storage Temperature: -20 to 80 °C
Weight:  Approx. 550 g 
CE Label:  According to EU directives about electromagnetical immunity
Note: The determination of the technical data of this pyrometer is carried out in accordance with VDI/VDE IEC TS 62942-2, the calibration / adjustment in accordance with VDI/VDE 3511, Part 4.4. See for more information. 
IMPAC Pyrometer IGA 140/23
MB 7: Foc. Optics 1 a=105...150 mm
MB 7: Foc. Optics 2 a=190...440 mm
MB 7: Foc. Optics 3 a=320...4300 mm
MB 9: Foc. Optics 1 a=105...150 mm
MB 9: Foc. Optics 2 a=190...440 mm
MB 9: Foc. Optics 3 a=320...4300 mm
MB 13: Foc. Optics 1 a=105...150 mm
MB 13: Foc. Optics 2 a=190...440 mm
MB 13: Foc. Optics 3 a=320...4300 mm
MB 18: Foc. Optics 1 a=105...150 mm
MB 18: Foc. Optics 2 a=190...440 mm
MB 18: Foc. Optics 3 a=320...4300 mm

Display of optical path:

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