IMPAC Pyrometer
IGA 320/23-LO

Small, short wavelength digital infrared thermometer with fiber optics for non-contact temperature measurement between 85 and 1200 °C.

IMPAC Pyrometer IGA 320/23-LO View
IMPAC Pyrometer IGA 320/23-LO With Fiber Optics 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 via USB converter or machine control (PLC)
  • Analog output adjustable to 0 or 4 to 20 mA for connection of standard analyzing instruments
  • Internal digital signal processing for high accuracy and long temperature ranges
  • High quality optics for measurement of small objects
  • Built-in LED targeting light for easy alignment to the measuring object


The IGA 320/23-LO is a short wavelength infrared measuring instrument with fiber optics and internal digital signal processing capabilities. This pyrometer is used for measurements of metallic surfaces, graphite and ceramics, etc.

For optimal match of the instrument to the application 2 different optics are available. The small dimensions of the optics allow easy integration into compact production machines.

The instrument is equipped with a fiber and an exchangeable optical head. The fiber and optical head are unaffected by electromagnetic interferences (e.g. induction) and can be used in high ambient temperatures up to 200 °C without additional

The included InfraWin software enables graphical display and storage of measurement values, as well as easy set-up of all instrument parameters.

Typical Applications

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


Technical Data

Measurement Specifications
Temperature Ranges:

(MB 6)      85 to    600 °C 

(MB 7)     100 to   700 °C  

(MB 12)   150 to 1200 °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

Note: The temperature of fiber and optical head must be at least 30 °C lower than the measuring temperature to get a correct temperature reading


(ε = 1, t90 = 1 s, Tamb. = 23 °C)

0.1% of reading in °C + 1°C

Note: The temperature of fiber and optical head must be at least 30 °C lower than the measuring temperature to get a correct temperature reading

Environmental Specifications
Protection Class: IP 65 (IEC 60529)
Operating Position: Any
Ambient Temperature: 0 to 70 °C at housing; up to 200 °C on side of fiber and optical head
Storage Temperature: -20 to 70 °C
Relative Humidity: Non condensating conditions
Weight: 0.53 kg incl. optical fiber and lens assembly
Housing: Stainless steel
CE Label:
According to EN 61326-1:2006-10
Connection: 8-pin connector


Optical head Type I or Type II (short distances only, see table); 

Ø 0.6 mm (green fiber mark) for MB 6,

Ø 0.4 mm (blue fiber mark) for MB 7,

Ø 0.2 mm (red fiber mark) for MB 12,

DIN connector electronics side and

SMA connector optics side

Sighting: Built-in LED targeting light  (default continuously on)
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, targeting light
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 0.5 V.
Power Consumption: Max. 1 W 
Switch Contact: Opto relays; max. 50 V DC, 0.2 A; Pmax = 300 mW
Hysteresis: 2 to 20 °C
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.  

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