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HF03-LI19 heat flux sensor

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.


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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.


Measurand heat flux
Measurement range 0 to 10 x 10³ W/m²
HF03 :
Rated exposure time interval 0 to 10 min
Calibration traceability to ITS90
Standard cable length 5 m
LI19 :
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 3 VDC
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


Suggested use

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