Monitoring heat flux sensor HF03-LI19

Overview
The HF03-LI19 is a portable heat flux measuring system that combines the HF03 mobile heat flux sensor with the LI19 high-accuracy handheld readout unit and data logger. It is typically used in fire testing to study heat flux levels of flares and fires, as well as to verify the on-site performance of permanently installed flare radiation monitors (such as model HF02). The HF03 sensor is rated for short exposures (less than 10 minutes) in high-flux environments up to 10 x 10³ W/m². The battery-powered LI19 unit displays actual heat flux directly in W/m² using factory-programmed sensor sensitivity, logs measurements internally, and communicates with a PC via USB. Operating at just 3 VDC, the system is frequently admitted into industrial facilities where mobile verification is needed.

Key features
• Mobile heat flux measurement: Designed for portable, on-the-spot monitoring in high-flux environments up to 10 x 10³ W/m² with short exposure intervals (< 10 min).
• Handheld readout and logging: LI19 readout unit displays real-time heat flux in W/m² and stores up to 3,518 measurements (logging minimum, maximum, and average values over user-selected intervals).
• High-resolution conversion: Features 16-bit analog-to-digital conversion with low temperature dependence (< 0.5 % + 3 x 10⁻⁶ V over the rated range) and a 1-second display refresh rate.
• USB connectivity: Connects to a PC via USB (1.1 / 2.0 low speed) for configuration, setting storage intervals, and exporting logged data using dedicated LI19 software.
• Long battery autonomy: Powered by 2 x AA batteries providing over 50 days of continuous field operation.
• Safe low-voltage operation: Operates on a 3 VDC internal power supply, facilitating site admission for spot checks.
• Sensor protection: Supplied with a dedicated protection cap to verify sensor zero signals and shield the detector during transport.
• Field verification reference: Serves as an ideal mobile reference tool for checking the performance of permanently installed flare monitors like the HF02.

Applications
• On-site performance verification and calibration checking of permanently installed flare radiation monitors (e.g., HF02).
• Fire testing and safety demonstrations.
• Mobile spot-checking of high-intensity industrial radiant and flame sources.
• Short-term thermal exposure investigations for safety personnel and equipment.

Specifications
HF03 Sensor:
• Measurand: Heat flux
• Rated measurement range: 0 to 10 x 10³ W/m²
• Rated exposure time interval: 0 to 10 min
• Calibration traceability: To ITS-90
• Standard cable length: 5 m

LI19 Readout Unit / Data Logger:
• 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
• Internal power supply voltage: 3 VDC
• Battery type: 2 x AA
• Battery life: > 50 days (on fresh batteries)
• Storage interval range: 2 to 65,535 s (user selectable)
• Storage capacity: 3,518 measurements
• Rated operating temperature range: -10 to +40 °C
• PC user interface: LI19 software
• Connection to PC: USB 1.1 / 2.0 low speed

Standard delivery items
• HF03 heat flux sensor with protection cap (5 m cable)
• Programmed LI19 readout unit with 2 x AA batteries
• 2 x spare AA-type batteries
• Rugged transport case with cutouts for sensors and accessories
• LI19 product certificate
• HF03 calibration/product certificate
• Strip with measurement unit markers
• USB cable
• LI19 software package