Hukseflux HF02 Heat Flux Sensor
HF02 is a sensor that measures radiant heat flux or thermal radiation in the outdoor environment. A common application is monitoring the radiation emitted by flares. HF02 is certified for use in potentially explosive atmospheres, and is rated for radiation levels up to 15 x10³ W/m². We recommend use of HF02 in a decision-supporting role only, and not to use measurements of HF02 as the main or sole source of information for judging safety.
Suggested use
- outdoor flare monitoring
HF02 is certified for use in potentially explosive atmospheres
HF02 is used in alarm systems, using the heat flux measurement to issue a warning in case of high thermal radiation exposure of equipment or personnel. It is typically installed close to a flare. A common assumption is that the heat flux level in a safe environment for personnel must not exceed 5 x 10³ W/m² (or 1.5 x 10³ BTU/(hr∙ft²)). Above that heat flux level, or when the temperature of the sensor body exceeds 70°C, an alarm is activated. A typical alarm system will include multiple HF01 sensors, all aimed at the main source of radiation, as well as other decision-supporting devices such as camera systems and temperature sensors. The sensor in HF02 measures the heat flux to its black (absorbing) surface, in the plane of the sensor, from a source in the field of view angle. It offers a measurement of the effective exposure for personnel and equipment from a source in the direction it is aimed at the location of the sensor. As the detector is essentially open (it has no protective windows) the measurement is influenced by wind in the same way as any exposed surface such as clothing worn by personnel or the surface of equipment; increased wind speed leads to a reduction of the measured heat flux. Rain on the detector can also lead to cooling and a reduction of the measured heat flux.
| Measurand: | heat flux temperature |
| Measurement range: | -30 to + 100°C 0 to 15 x10³ W/m² |
| Sensitivity (nominal): | 0.3 x10⁻⁶ V/(W/m²) |
| Model names according to EU type examination: | LEX35A, LEX35B or LEX35C |
| Heat flux sensor: | thermopile |
| Temperature sensor: | thermocouple type KX |
| EC type examination certificate: | included in delivery |
| ATEX rated operating conditions: | II 2 G EEx d IIC T6 |
| Electrical data: | U[max] 5 V, I[max] 5 x 10⁻³ A |
| Rated process temperature range: sensor and high temperature cable: | -50 to +300°C |
| Rated operating temperature range: transition piece, low temperature extension cable and cable end: | -20 to +70°C |
| -High temperature cable: | 3 m (see options) |
| -Low temperature extension cable: | 3 m (see options) |
| IP protection class: | |
| -Sensor and high temperature cable: | IP68 |
| -Low temperature extension cable: | IP67 |
| Safety notes: | see manual |
| Maintenance requirements: | see manual |
| Options: |
|