IMPAC Pyrometer

Digital 2-color pyrometer with fibre optic for non-contact temperature measurement of a cast iron pouring stream. Temperature ranges between 750 and 2500 °C.


Pyrometer IMPAC ISR 12-LO View
Pyrometer IMPAC ISR 12-LO Inside View
Pyrometer IMPAC ISR 12-LO Cover View
Pyrometer IMPAC ISR 12-LO Cover Inside View
Pyrometer IMPAC ISR 12-LO With Protection View

Key Features

  • Accurate measurement of pouring stream 
  • Automatic recording of the pouring temperature 
  • Documentation of the temperature of each single pouring process 
  • Replacement or reduction of immersion lance measurements with expandable thermocouples
  • Minimum system maintenance required


The pyrometers ISR 12-LO/GS is a special foundry system for the measurement of the pouring stream in foundries. This system is useful in automatic or semi automatic pouring machines and displays the temperature after each single pouring process.

A ratio pyrometer is required for this application because:

  • molten metal has a very low and fluctuating emissivity
  • the position of the pouring stream is moving so that the measuring spot of the pyrometer is only partially filled.

The pyrometer has a special pouring stream mode which calculates one average temperature value for each single casting process. Temperature values in the beginning and the end of the casting process can be eliminated which can affect the correct measurement. The shape of the spot size of the optics is a line which guarantees that even a moving pouring stream is always within the spot.

The pyrometers are equipped with a lens contamination monitoring system. If the signal strength is too low caused by contamination of the lens or a sighting window, a signal output switches an alarm transmitter.

The pouring stream temperature of each single casting process and with that of each single casted part can be recorded automatically with the ISR 12-LO/GS. The temperature value of each finished casting process is displayed on the pyrometer and available as analog and digital output. With that the casting can be controlled very accurately to achieve the high quality requirements of casted parts. The measured values can be stored and displayed via analog and digital output.


Temperature ranges:

MB 18   750 - 1800°C 

MB 25   900 - 2500°C 

Sub range: any range adjustable within the temperature range, minimum span 51 °C
Spectral range: 0.8 µm / 1.05 µm 

Measuring modes:

Pouring stream / ratio- (2-color-) / mono- / metal mode switchable

Power supply: 24 V DC (15 - 40 V DC) or 24 V AC (12 - 30 V AC), 48 - 62Hz
Power consumption: max. 10 W
Analog output: 0 - 20 mA or 4 - 20 mA switchable, load 0 to 500 Ohm, test current 10 mA by pressing test key
Digital interface: Switchable: RS232 or RS485 addressable (half duplex), baud rate 2.4 up to 115.2 kBd
Resolution: Display: 1°C; interface: 0.1°C; analog output: < 0.025% of temperature range 
Isolation: Power supply, analog output and digital interface are galvanically isolated from each other

Built-in 4-digit 7-segment-LED, height 13 mm;

LED’s for: - °C/°F;

                 - clear mode “auto“,“ext“;

                 - ratio- (2-color) / mono- / metal mode


Adjustable or readable at the device or via interface:

     Emissivity slope K, emissivity ε, exposure time t90, clear times for maximum value storage tclear, automatically or external deletion of maximum value storage, switching measuring mode, switch-off limit, analog output 0 - 20 or 4 - 20 mA, sub range, address, baud rate, °C/°F

Readable at the device or via interface:

     Pouring stream temperature (in 1-color mode: measuring temperature)

Only adjustable via interface commands:

     Pre-run time, follow-up time, start condition, wait time tW, keyboard lock

Pre-run time: 0 - 9.9 s adjustable in steps of 0.1 s
Follow-up time: 0 - 9.9 s adjustable in steps of 0.1 s
Start condition:

0 - 99% (amount of measurement values in % that must exceed

The beginning of the adjusted temperature range)

Emissivity slope K: ε12: 0.8 - 1.2 (adjustable in steps of 0.001)
Emissivity ε:  0.1 - 1 (adjustable in steps of 0.001, only in mono mode)
Switch-off limit: 2% - 50% (in 1%-steps)
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), extern, via interface or automatically with the next measuring object, hold function to freeze the actual displayed pouring stream temperature
Switch contact: max. 0.15 A (only active with automatic clear mode or tclear ≥ 0.5 s)

Measuring uncertainty:

(ε = 1, t90 = 1 s)

0.4% of reading in °C + 1°C (< 1500°C)

0.6% of reading in °C + 1°C (> 1500°C)

Repeatability: 0.2% of reading in °C + 1°C
Control panel: 4 function keys, switch for serial interface, push button for test current

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

(measurement is stopped while laser targeting light is switched on)

Protection class: IP65 (DIN 40 050)
Ambient temperature:

Converter housing: 0 to 60°C

Optical head up to 250°C

Storage temperature: -20 to 70°C
Relative humidity: Non condensing conditions
Weight converter: 2.2 kg
CE-label: According to EU directives about electromagnetic immunity


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