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Calex PyroUSB Series Infrared Thermometer

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Part Number: PyroUSB
PyroUSB is a PC Configurable Non-Contact Temperature Sensor with 4 to 20 mA Output and a scalable temperature range from -40 to 1000°C


The PyroUSB Series measures temperatures from -40°C to 1000°C accurately and consistently, with an outstanding response time of 240 ms.
The 4 to 20 mA output is compatible with almost any indicator, controller, recorder, data logger etc. without the need for special interfacing or signal conditioning.
PyroUSB-151 has 15:1 optics making it suitable for most applications. PyroUSB- 301 is specially designed for distant targets and has an optical resolution of 30:1. PyroUSB-CF is designed for small targets and measures a spot size of ø5mm at 100mm distance.
All PyroUSB Series sensors are fully configurable from a PC using the CalexSoft software and USB cable supplied. This user friendly software enables the user to set the range and emissivity, compensate for reflected energy; apply filtering; select max, min, average or instantaneous readings; and peak or valley hold processing. These features can also be monitored and adjusted by an OPC Client. Other features include Data Acquisition, Alarms and a Scrolling Graphical Display.
The sensor will operate with either the 4 to 20 mA cable connected, the USB cable connected, or both. TheUSB cable has an IP65 connector at the sensor end.
An IP65 cap protects the sensor when the USB cable is not connected.


  • Configurable temperature range, emissivity setting etc. from a PC via CalexSoft software and USB cable (supplied)
  • Features max; min; average and instantaneous readings; peak or valley hold; reflected energy compensation
  • OPC Server capabilities
  • Temperature range –40 to 1000°C
  • Emissivity: 0.1 to 1.0
  • Response time: 240 ms to 90%
  • Stainless steel housing, sealed to IP65
  • Field of view: 15:1, 30:1 or Close Focus
  • 4 to 20 mA output
  • Quick and easy installation
  • Optional air/water cooled housing, air purge collar, laser sighting tool and mounting brackets

Temperature Range -40°C to 1000°C
Field-of-View 15:1 (PyroUSB-151)
30:1 (PyroUSB-301)
ø5mm @ 100mm (PyroUSB-CF)
Output 4 to 20 mA (linear with temperature)
Configuration Via PC port conforming to USB 2.0
Accuracy ±1% of reading or ±1°C whichever is greater
Repeatability ±0.5% of reading or ±0.5°C whichever is greater
Emissivity 0.1 to 1.0
Response Time, t90
240 ms (90% response)
Spectral Range 8 to 14 µm
Supply Voltage 24 V DC (28Vdc max)
Sensor Voltage 6 V DC min
Max Loop Impedance 900 Ω

Construction Stainless Steel
Dimensions 25 mm diameter x 106.5 mm long
Thread mounting M20 x 1 mm pitch
Weight with Output Cable 175 g
Output Cable Length 1 m
USB Cable Length 1 m

Environmental Rating IP65
Ambient Temperature Range 0°C to 70°C
Relative Humidity 95% max. non-condensing

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