Portable heat flux sensor, with read-out unit / datalogger

HF03 is a heat flux sensor that is applied in mobile measurements. It is combined with LI19, a high accuracy handheld read-out unit / datalogger. The combination HF03- LI19 is typically used to study heat flux levels of flares and fires, and to verify the performance of permanently installed flare radiation monitors and flare heat flux sensors.

  • Operation of HF03-LI19 is easy
  • Mobile measurements
  • High accuracy handheld read-out unit / datalogger


HF03 is a heat flux sensor commonly used in fire testing
HF03 is a heat flux sensor commonly used in fire testing. It is designed for short (< 10 min) monitoring and measurement in high flux environments in the heat flux range up to 10 x 10³ W/m². LI19 displays the measured heat flux. Once programmed with the sensitivity of the connected sensor, the display will show the actual value of the heat flux in W/m². LI19 is programmed via its PC user interface. It communicates over USB. We recommend downloading the latest software. LI19 may also be used to store measured data. LI19 is battery powered, using 2 x AA-type batteries. Fresh batteries allow 50 days of operation. HF03-LI19 is not rated for EEx (potentially explosive) environments; nevertheless it is often admitted, because the instrument operates on 3 VDC only.

Operation of HF03-LI19 is easy. As LI19 has already been programmed at the factory, measurements can start by switching on the LI19. The data storage interval is set by using the LI19 user interface software.

Suggested Use

  • Verification of performance of permanently installed flare radiation monitors such as HF02
  • Monitoring during fire-safety demonstrations

Areas of Application
Industrial monitoring and control / heat flux and heat transfer measurement



heat flux

Measurement range

0 to 10 x 10³ W/m²

Rated exposure time interval

0 to 10 min

Calibration traceability

to ITS90

Standard cable length

5 m

Output on display with HF03

heat flux in x 10³ W/m²

Stored measurement definition

minimum maximum and average over storage interval with conversion to W/m²

A/D conversion

16 bits

Temperature dependence

< 0.5 % + 3 x 10⁻⁶ V over rated range

Display refreshment rate

1 s⁻¹

Battery type

2 x AA

Internal power supply voltage


Battery life

> 50 days (on fresh batteries)

Storage interval range

2 to 65535 s (selectable)

Storage capacity

3518 measurements

Rated operating temperature range

-10 to +40 °C

User interface on PC

LI19 software

Connection to PC

USB 1.1 / 2.0 low speed


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