PyroUSB Infrared Temperature Sensor with 4~20mA Output

Product Code: HLUA

The PyroUSB Series measures temperatures from -40°C to 2000°C accurately and consistently, with an outstanding response time of 200 ms.

The 4 to 20 mA output is compatible with almost any indicator, controller, recorder or data logger, without the need for special interfacing or signal conditioning. A choice of measurement wavelengths is available to suit a range of applications.

All models have USB communications. A USB cable and Windows software is included. All data is transmitted via Modbus, so it is easy to configure and read temperatures from the sensor using third-party software. The USB cable has an IP65 connector at the sensor end. An IP65 cap protects the sensor when the USB cable is not connected.


The sensor is supplied with configuration software which is Windows® compatible (Vista onwards). The software will configure emissivity, Peak/Valley hold processing, Reflected Energy Compensation, 4~20mA output temperature scale, and show averages. It displays temperature readings, temperature charts and logs data from the USB connection in real time. Multi-channel software for sensors with digital communications is available for free download. The sensor’s Modbus protocol allows it to be used with other 3rd-party Modbus software.

HLUA8 General-purpose

HLUA8-301 (8-14 μm) models can measure from -40°C to 1000°C. They are suitable for measuring high-emissivity materials such as paper, thick plastics, food, pharmaceuticals, rubber, asphalt and painted surfaces. These models are capable of measuring very low temperatures, so they are ideal for sub-zero measurements in the food, logistics and storage industries. 30:1 optics supplied as standard.

HLUA2 Short-wavelength

HLUA2 (2.2 μm) models have a choice of temperature ranges from 45°C to 2000°C. They provide a more accurate reading when measuring low-emissivity materials such as many reflective metals. They are also capable of measuring through glass viewports. 15:1 and 25:1 optics options available.

HLUA5 Glass

HLUA5 (5 μm) models have a choice of temperature ranges from 50°C to 1650°C. They are filtered at a wavelength where glass is least reflective, making them an ideal pyrometer for glass surface temperature measurement. 25:1 optics supplied as standard.

This product can be supplied with a calibration certificate. Contact sales for further information. This product can be supplied with a calibration certificate. Contact sales for further information.
  • Features
  • Technical
  • Options
  • Documents
  • Software
    • Temperature ranges from -40°C to 2000°C
    • 2-wire 4-20 mA output
    • Fully configurable via USB using Modbus protocol. Cable/software included
    • Specialised models for measuring metals, high-temperature objects or glass surfaces
    • General-purpose models for most other applications
    • Peak and valley hold mode allows easy measurement of objects on conveyors
    • Stainless steel housing, sealed to IP65
    • Quick and easy installation
  • General Specification
    Model HLUA8 HLUA2 HLUA5
    Spectral Response 8 to 14 μm 2.2 μm 5 μm
    Application General purpose Ferrous metals and high-temperature targets Glass
    Temperature Range -40°C to +1000°C +45°C to +2000°C +50°C to +1650°C
    Response Time 200 ms 200 ms 200 ms
    Accuracy ±1°C or 1% of reading ±2°C or 1% of reading ±1°C or 1% of reading
    Output 2-wire, 4~20mA, linear with measured temperature
    Communications USB 2.0 (removable USB cable and software included) using the Modbus protocol
    Optics Choice of divergent or focused optics for small or large targets at short or long distances
    Repeatability ±0.5°C or ±0.5% of reading, whichever greater
    Emissivity Setting 0.1 to 1.0
    Min. Span (4~20mA output) 100°C
    Max. Span (4~20mA output) Full temperature range


    Mechanical Specification
    Construction Stainless steel
    Dimensions 27.6mm diameter x 61mm length including cable glands
    Thread Mounting M20 x 1mm pitch, length 15mm
    4~20mA Output Cable Length 1m (standard), up to 30m (optional)
    Weight with 1m Output Cable 155g
    USB Cable Length 1.8 metre


    Environmental Specification
    Environmental Rating IP65
    Ambient Temperature Range 0°C to +70°C (cooled models are available for higher temperatures)
    Relative Humidity 95% max. non-condensing


    Electrical Specification
    Supply Voltage 24 V DC (28 V DC max.)
    Min. Sensor Voltage 6 V DC
    Max. Loop Impedance 900 Ω @ 24 V DC
  • HLUA8 General-Purpose Code
    Optics 30:1 301
    Range -40°C to 1000°C ST


    HLUA2 Short-Wavelength Code
    Optics  15:1 151
    25:1 251
    Range    45°C to 300°C* LT
    100°C to 400°C* PT
    250°C to 1000°C* MT
    450°C to 2000°C* HT

    * 15:1 optics models only 


    HLUA5 Glass Code
    Optics 25:1 251
    Range  50°C to 1000°C GLT
    200°C to 1650°C GHT


    Order Code Example (Glass, 25:1, 200°C to 1650°C): HLUA5-251-GHT

  • Software


    Compatible with 32-bit and 64-bit versions of Microsoft Windows XP, Vista, 7, 8 and 10