IMPAC Pyrometer

Stationary, digital 2-color pyrometer with fibre optics for non-contact temperature measurement between 700 and 2500 °C

Пирометр IMPAC ISQ 5-LO View

Key Features

  • Temperature ranges between 700 and 2500 °C
  • High accuracy
  • Wide temperature ranges
  • Very small spot sizes, min 0.45 mm
  • Laser targeting light
  • Analog output 0 to 20 mA or 4 to 20 mA
  • Digital interface RS232 or RS485
  • Built-in maximum value storage
  • Bus control (RS485)
  • Fibre optic and optical head withstand up to 250 °C
  • Rugged mono fiber optic (max. length up to 30 m)


The pyrometer ISQ 5-LO is a digital, accurate 2-color pyrometer with fibre optic for non-contact temperature measurement.

The pyrometer measures in the 2-color principle (ratio principle) in which two adjacent wavelength are used to calculate the temperature. This technique offers the following advantages compared with the standard one-color pyrometers: the temperature measurement is independent of the emissivity of the object in wide ranges, it is unaffected by dust and other contaminants in the field of view, it is unaffected by dirty viewing windows, the measuring object can be smaller than the spot size.

Additionally the pyrometer can be switched to 1-color mode and used like a conventional pyrometer. The instrument is equipped with an optical fibre (length up to 30 m), which can be used in very high ambient temperatures up to 250°C without cooling and it is unaffected by electromagnetic interferences.

Two different optical heads for different measuring distances and very small spot sizes are available. The response time of only 10 ms facilitates the measurement of fast heating processes. The most important parameters can be set directly in the instrument, all instrument’s parameters can be adjusted with the portable parametrizing device HT 6000 or with the digital indicator DA 6000-N. The parametrizing can also be done with the PC and the standard operating software InfraWin. Additionally the software offers online temperature display and data storage.

Typical Applications:

  • Induction heating
  • Welding
  • Casting
  • Forging
  • Annealing
  • Sintering
  • Rolling mill
  • Rotary kilns
  • Pouring stream


Temperature range: (MB 18)   700 to 1800°C
(MB 25)   800 to 2500°C 
Sub range: Any range adjustable within the temperature range, minimum span 51°C
Spectral Range: Channel 1: 0.7 ... 1.15 μm; channel 2: 0.97 ... 1.15 μm
Power Supply: : 24 V DC ± 25%, stabilised, ripple < 50 mV
Max load:  ≤ 3 VA (incl. active laser targeting light)
Analog Output: 0 to 20 mA or 4 to 20 mA, switchable, linear in temperature, load independent DC
Interface: RS232 or RS485 (addressable), half duplex, baud rate 1.2 up to 38.4 kBd
Resolution: 0.1°C at the interface at the analog output < 0.1% of the adjusted temperature range but min. 0.1°C
Isolation: Power supply and digital output and analog output are galvanically isolated against each other
Parameters Adjustable on the converter’s rear side: emissivity slope, response time, analog output 0 to 20 mA or 4 to 20 mA, online / offline mode
Additionally via interface adjustable and readable: 2-color / 1-color temperature signal, according to this emissivity slope or emissivity, temperature sub range, settings for maximum value storage, address, baud rate, switch off limit, warning level lens contamination monitoring system.
Via interface readable only: measured value, internal temperature of the unit
Maximum Value Storage Built in single or double storage, clear modes: time (off; 0.01 s; 0.05 s; 0.25 s; 1 s; 5 s; 25 s),
external clear contact, via interface or automatic „hot object mode“, hold-function for freezing the
current temperature reading (not for ISQ 5-LO-C)
Emissivity slope K: 0.800 to 1.250
Emissivity ε (mono channel mode): 0.05 to 1.00
Response time t90: < 10 ms, adjustable to 0.01s; 0.05s; 0.25s; 1s; 3s; 10s
Switch off limit: Adjustable via interface: 2% to 50%
Contamination Warning: Relay contact, max. continuous current 0.4 A, setting of the switch level: 0 (off) ... 99%
(K=1, t90=1 s, Tamb.=25°C)
< 1500°C: 0.5% of reading in °C + 2°C
> 1500°C: 1.0% of reading in °C
Repeatability: 0.2% of reading in °C + 2°C (K = 1, t90= 1 s, Tamb.= 25°C)
Noise equivalent temperature
difference (NETD):
(K=1, t90=10 ms, Tamb.=10...40°C)

MB 18: 0.4°C (at 710°C meas. temperature)    0.1°C (at 800°C meas. temperature)

MB 25: 0.4°C (at 810°C meas. temperature)    0.1°C (at 900°C meas. temperature)

Temperature Dependence: ± 0.25°C per °C deviation of ambient temperature from 25°C
Sighting System: Laser targeting light (max. power level < 1 mW, λ= 630-680 nm, CDRH class II)
Operating Temperature: 0 to 70°C at the converter housing, up to 250°C at optical head and fiber
Storage Temperature: -20 to 70°C
Housing: Stainless steel
Weight: Converter: approx. 550 g; optical head: approx. 140 g; fiber (2.5 m): approx. 250 g
Protection system: IP65 (according to DIN 40050)
CE-label: According to EU directives about electromagnetic immunity

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