IMPAC Pyrometer
IN 5/5 plus
IN 5/5-L plus
IN 5/5-H plus

Digital, precise, compact. Compact pyrometer for temperature measurement of glass and quartz glass surfaces. Temperature ranges: 100 to 2500 °C. These pyrometers offer analog output 0 or 4 to 20 mA, digital interface RS232 or RS485 and a laser targeting light sighting system 

Pyrometer IMPAC IN 5/5 plus Front View

Key Features

  • High accuracy due to digital linearisation of the output 
  • Small spot sizes, min. 1.1 mm 
  • Adjustable exposure time 
  • Compact housing


The pyrometer IN 5/5 as well as the instruments of series IN 5/5 plus are specially designed for non-contact temperature measurement of glass surfaces and quartz surfaces.

The instruments differ in their specification:

The IN 5/5 is a digital pyrometer in two wire technique. This technique combines the high accuracy of the digital signal processing with the simple connection and operating with two wires.

Additionally to the analog output the plus types are digital pyrometers equipped with a digital interface, enabling temperature indication and storage on a PC. Also a temperature sub range can be configured and the instrument parameters can be adjusted remotely.

The version IN 5/5-L plus is equipped with optics with better fields of view for the measurements of small objects.

The high-speed version IN 5/5-H plus has a shorter exposure time of only 10 ms and is suited for fast measuring tasks.

For optimal match of the instrument to the application (size of the measuring object, distance) different optics are available.

For a precise alignment of the pyrometers to the measuring object, most of the plus types are equipped with a laser targeting light.

Typical Applications:

  • Float glass
  • Hollow glass
  • Glass drop
  • Glass hardening
  • Glass bending
  • Bulb production
  • Heat treatment 


Temperature range:

IN 5/5 plus:

100 to 1300°C (MB 13)

400 to 2500°C (MB 25)

IN 5/5-H plus; IN 5/5-Lplus: 

200 to 1300°C (MB 13)

400 to 2500°C (MB 25)

IN 5/4plus: 

300 to 1300°C (MB 13)

500 to 2500°C (MB 25)

Sub range: The plus instruments are user adjustable with minimum span of 51°C
Spectral Range:

IN 5/5plus; IN 5/5-Hplus; IN 5/5-Lplus : 5.14 μm

IN 5/4plus 3.9 μm

IR Detector: Thermopile
Data handling: Digital
Optics: Zinc-Sulfide lens (ZnS)
Power Supply: : 24 V DC (18 to 30 V); nominal, ripple must be less than 0.5 V
Power Consumption: max. 70 mA
Analog Output: 0 to 20 mA or 4 to 20 mA (linear), adjustable
Load: max. 500 Ω at 24 V (max. 200 Ω at 18 V)
Interface: RS232 or RS485 (addressable, half duplex), baud rate 1.2 up to 19.2 kBd, resolution 0,1°C
Isolation: Power supply, analog outputs and digital interfaces are electrically isolated from each other
Parameters Adjustable on the pyrometer: Emissivity, exposure time. Additionally on plus instruments: analog output to 0 or 4 to 20 mA, online- / offline switch.
Via interface / PC adjustable and readable (only plus instruments in online mode): Emissivity, exposure time, 0 or 4 to 20 mA analog output, sub temperature range, max./min value storage with different clear times or automatic or external clearing mode, address, baud rate, internal temperature, display in °C or °F, activation of ambient temperature compensation
Maximum / Minimum value
storage (plus instruments):
Built-in single and double storage. clearing with clear time tclear (0.1 s; 0.25 s; 0.5 s; 1 s; 5 s; 25 s),
external contact or via interface or also automatically with each new item to be measured
Emissivity ε: 0.2 to 1 adjustable

Exposure Time t90:


IN 5/5plus: 0.08 s

IN 5/5-Hplus: 0.01 s

IN 5/5-Lplus: 0.18 s

Adjustable in the pyrometer: 0.5 s; 1 s; 2 s; 5 s,

Adjustable via interface: 0.5 s; 1 s; 2 s; 5 s; 10 s; 30 s

Measurement uncertainty:
Dependent on object temperature T and
ambient temperature Tamb
(ε= 1, t90= 1 s)

T < 1300°C:

0.6% (IN 5/5-Lplus: 0.8%) of reading in °C or 2°C (Tamb=15 to 30°C) *) 

1% of reading in °C or 1.5°C (Tamb=0 to 15 or 30 to 63°C) *)

T=1300 to 1800°C: 

0.8% of reading in °C (Tamb=15 to 30°C)

1.2% of reading in °C (Tamb=0 to 15 or 30 to 63°C)

T=1800 to 2500°C: 

1% of reading in °C (Tamb=15 to 30°C)

1.4 % of reading in °C (Tamb=0 to 15 or 30 to 63°C)
*)Whichever value is greater. The instrument must be at a constant ambient temperature for a minimum of 15 minutes(30 min for IN 5/5-Lplus for 200 to 1300°C at Tamb = 0 to 15 or 30 to 63°C) and has to be connected to the power supply.

Repeatability: (ε = 1, t90= 1 s)
0.3 % of reading in °C or 0.6 °C
Whichever value is greater. The instrument must be at a constant ambient temperature for a minimum of 15 min. (30 min for IN 5/5-L
plus for 200...1300°C at Tamb= 0 to 15 or 30 to 63°C
Noise Equivalent Temperature Difference
(NETD): (ε = 1, Tamb= 23°C)

IN 5/5Plus:

At t90= 80 ms: 0.7°C (at 110°C measuring temperature)

At t90= 1 s: 0.4°C (at 110°C measuring temperature)

IN 5/5-HPlus:

At t90= 10 ms: 0.5°C (at 500°C measuring temperature)

At t90= 10 ms: 0.3°C (at 1100°C measuring temperature)

IN 5/5-LPlus: 

At t90= 80 ms: 1.5°C (at 300°C measuring temperature)

At t90= 80 ms: 0.6°C (at 500°C measuring temperature)

At t90= 1 s: 0.4°C (at 300°C measuring temperature)

At t90= 1 s: 0.2°C (at 500°C measuring temperature)

IN 5/4Plus:

At t90= 80 ms: 0.6°C (at 500°C measuring temperature)

At t90= 80 ms: 0.2°C (at 1100°C measuring temperature)

Ambient Temperature: 0 to 63°C; IN 5/5 plus MB 25: 0 to 60°C
Sighting: Laser targeting light (max. power level < 1 mW, λ= 630-680 nm, CDRH class II)
Storage Temperature: -20 to 70°C
Housing: Stainless steel
Weight: 410g
Protection class: IP65 (DIN 40050)
Relative humidity: Non condensing conditions
CE-label: According to EU directives about electromagnetic immunity

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