IMPAC Pyrometer
IGA 320/23

Small, short wavelength digital infrared thermometer for non-contact temperature measurement of metallic surfaces, graphite or ceramics between 75 and 1800 °C.

IMPAC Pyrometer IGA 320/23 View
IMPAC Pyrometer IGA 320/23 With Built-in LED View

Key Features

  • Small housing dimensions for easy installation, suitable for use in confined spaces
  • RS485 interface for long transmission networks for connection to a PC
  • Analog output adjustable to 0 or 4 to 20 mA for connection of standard analyzing instruments
  • Internal digital signal processing for high accuracy
  • High quality optics for measurement of small objects
  • Built-in LED targeting light for easy alignment to the measuring object


The IGA 320/23 is a short wavelength infrared measuring instrument with internal digital signal processing. It is used for measurements of metallic surfaces, graphite and ceramics, etc.

The very small housing dimensions enable the integration of the pyrometer into compact production machines and the solid and robust design guarantees reliability even in rough industrial environments.

The instruments are equipped with a choice of optics for small spot sizes. Using an additional close-up lens these spot sizes can be reduced even more, with a measuring distance 50 or 120 mm.

The LED targeting light enables precise alignment on the measurement object. It is automatically active and can be used during measurement.

Additional to the analog output the pyrometer is equipped with a digital RS485 interface. This enables secure data transmission to a PC or an PLC, over long distances. The provided InfraWin software enables the graphical display and storage of measurement values; plus the setting of all instrument parameters.

Typical Applications

  • preheating
  • annealing
  • tempering
  • welding
  • forging
  • hardening
  • sintering
  • melting
  • soldering
  • brazing
  • rolling
  • tempering


Technical Data

Measurement Specifications
Temperature Ranges:

MB 5.5    75 to 550 °C  

MB 7      100 to 700 °C   

MB 12    150 to 1200 °C 

MB 18    200 to 1800 °C 

Sub Range: Any range adjustable within the temperature range, minimum span: 51 °C

Spectral Ranges:

2 to 2.6 μm (main wavelength 2.3 μm)  

IR Detector:

Extended InGaAs

Resolution: 0.1 °C on interface; < 0.025% of the adjusted temperature sub range at the analog output
Emissivity ε: 10.0 to 100.0% adjustable via interface in steps of 0.1%
Transmittance τ: 10.0 to 100.0% adjustable via interface in steps of 0.1%
Measurement Uncertainty:
(ε = 1, t90 = 1 s, Tamb. = 23 °C) Note: the pyrometer must operate at least 30 min before these values are valid

Up to 400 °C: 2 °C

above 400 °C: 0.3% of measured value in °C + 1 °C

above 1500 °C: 0.5% of measured value in °C


(ε = 1, t90 = 1 s, Tamb. = 23 °C)

0.1% of reading in °C + 1°C
Environmental Specifications
Protection Class: IP 65 (IEC 60529)
Operating Position: Any
Ambient Temperature: 0 to 70 °C at housing
Storage Temperature: -20 to 70 °C
Relative Humidity: Non condensating conditions
Weight: 0.3 kg
Housing: Stainless steel
CE Label: According to EU directives about electro-magnetical immunity
Connection: 8-pin connector
Sighting: Built-in LED targeting light
Parameters: Adjustable via interface: Emissivity ε, transmittance τ, exposure time t90, max./min. value storage, analog output, sub temperature range, ambient temperature compensation, pyrometer address, switch contact, hysteresis, baud rate, wait time tw
Analog Output: 0 to 20 mA or 4 to 20 mA (linear) swtichable
Digital Interface: RS485 addressable (half-duplex), baud rate 1200 up to 38400 Bd
Exposure Time t90: 2 ms (with dynamical adaptation at low signal levels); adjustable to 0.01 s; 0.05 s; 0.25 s; 1 s; 3 s; 10 s
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), via interface, automatically with the next measuring object
Power Supply: 24 V DC (10 to 30 V DC), ripple must be less than .5 V.
Power Consumption: Max. 1 W 
Switch Contact: Opto relays; max. 50 V DC, 0.2 A; Pmax = 500 mW
Hysteresis: 2 to 20 °C, adjustable
Load (analog output): 0 to 500 Ω
Isolation: Power supply, analog output and digital interface are galvanically isolated from each other

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 320/23
MB 5.5 Optics 250 without close-up lens
MB 5.5 Optics 250 with close-up lens 1
MB 5.5 Optics 250 with close-up lens 2
MB 7 Optics 250 without close-up lens
MB 7 Optics 250 with close-up lens 1
MB 7 Optics 250 with close-up lens 2
MB 12 Optics 250 without close-up lens
MB 12 Optics 250 with close-up lens 1
MB 12 Optics 250 with close-up lens 2
MB 18 Optics 250 without close-up lens
MB 18 Optics 250 with close-up lens 1
MB 18 Optics 250 with close-up lens 2
MB 5.5 Optics 800
MB 7 Optics 800
MB 12 Optics 800
MB 18 Optics 800

Display of optical path:

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