IMPAC Pyrometer
IS 50-LO plus

Pyrometer with fiber optics for non-contact measurements on metals, ceramics, graphite etc. with temperature ranges between 550 and 3300 °C

Pyrometer IMPAC IS 50-LO plus View 1
Pyrometer IMPAC IS 50-LO plus View 2
Pyrometer IMPAC IS 50-LO plus Display View

Key Benefits

  • Very short response time below 1 ms
  • Extremely short spot sizes, min. 0.45 mm
  • Built-in LC display
  • Laser targeting light
  • Parameter adjustments via integrated key pad or interface
  • Interface RS232 / RS485 switchable
  • Test current output


The pyrometer IS 50-LO plus is a digital, highly accurate pyrometers with fiber optics for non-contact temperature measurement on metals, ceramics, graphite etc. between 500° and 3300 °C.

The instrument is equipped with a fiber and an exchangeable optical head. The fiber and optical head are unaffected by electromagnetical interferences (e.g. induction) and can be used in high ambient temperatures up to 250 °C.

Two different types of optical heads for different measuring distances and very small spot sizes are available. A laser targeting light enables the exact alignment onto the measuring object.

The very short response time of below 1 ms facilitates the measurement of fastest heating processes. The pyrometer is equipped with a display which shows in measuring mode the current temperature. Additionally all parameters can be read if they are changed via the integrated keys at the instrument.

Via serial interface and the provided software InfraWin the temperature can be displayed and stored on a PC, parameterizing can also be done.

Typical Applications

  • metal molds
  • pressing tools
  • bearings, bearing housings
  • preheating
  • annealing
  • tempering
  • sintering
  • soldering
  • rolling
  • brazing
  • normalizing


Technical Data


Temperature Range:


MB 14: 550...1400 °C

MB 16: 600...1600 °C

MB 18: 650...1800 °C

MB 25: 750...2500 °

MB 33: 900...3300 °C

MB 18L: 550...1800 °C

MB 20L: 600...2000 °C

Subrange: Any range adjustable within the temperature range, minimum span 51 °C
Spectral Ranges:

0.7 ... 1.1 µm

Signal Processing: Fotoelectric current, digitized immediately

Measuring uncertainty:

(at ε=1, t90=1 s,

Tamb.=23 °C)

below 1500 °C: 0.3% of measured value in °C + 1 °C

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


Interface and display: 0.1°C, analog output:

< 0.1 % of the adjusted temperature range


(at ε=1, t90=1 s,

Tamb.=23 °C)

0.1% of reading in °C + 1°C
Emissivity ε: 20 ... 100% adjustable inside the instrument or via interface in steps of 0.1%
Exposure Time t90: < 1 ms adjustable to 0.01 s; 0.05 s; 0.25 s; 1 s; 3 s; 10 s
Maximum Value Storage:

Single or double storage; cleared by: preselected time interval or external deletion contact or via digital interface or automatically with the next measuring object

Sighting: Laser targeting (max. power level < 1 mW, λ = 630-680 nm, CDRH class II) 

Note: The calibration / adjustment of this pyrometer is carried out in accordance with VDI/ VDE 3511, Part 4.4. See for more information.


Analog Output:

Linear 0 ... 20 mA or 4 ... 20 mA, DC, switchable; load max. 500 Ohm

Serial Interface: Switchable: RS232 or RS485 (addressable), half duplex; baud rate 1.2 up to 115 kBd
Display: Illuminated LC display for temperature indication or parameter settings
Switch contact: Max. 0.15 A (to recognize a hot object in the measuring beam)
Test Current Output: 

Fixed 10 mA (for 0 to 20 mA analog output) or

fixed 12 mA (for 4 to 20 mA analog output) for

inspection of wiring and connected instruments


Adjustable at the instrument or via serial interface:

emissivity ε,  exposure time t90, analog output, address, baud rate, waiting time, °C / °F, setting of the maximum value storage, temperature sub range

Power Supply:

24 V AC or DC (12 - 30 V AC or DC)

(AC: 48 - 62 Hz)

Power Consumption: max. 2 W
Isolation: Power supply, digital interface, analog output are galvanically isolated against each other
Ambient Temperature:

0 ... 60 °C on the converter, up to 250 °C on side of fiber/ optical head


Storage Temperature: -20 .... 70 °C
Rel. Humidity: Non condensing conditions
Protection Class: IP54

Converter: 600 g; optical head II: 140 g;

fiber (2.5 m): 250 g

CE-Label: According to EU directives about electromagnetic immunity
IMPAC Pyrometer IS 50-LO plus
Fixed Optics I a=120 mm
Fixed Optics I a=260 mm
Fixed Optics I a=700 mm
Fixed Optics II a=87 mm
Fixed Optics II a=200 mm
Fixed Optics II a=600 mm
Fixed Optics II a=4500 mm
Focusable Optics II a=88...110 mm
Focusable Optics II a=95...129 mm
Focusable Optics II a=105...161 mm
Focusable Optics II a=200...346 mm
Focusable Optics II a=247...606 mm
Focusable Optics II a=340...4500 mm

Display of optical path:

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