HF02
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Catalog excerpts

HF02 - 1

HF02 FLARE RADIATION MONITOR / HEAT FLUX SENSOR HF02 (formal indication LEX35A, B or C), is a temperature sensor than can be used for sensing heat flux or thermal radiation in an outdoor environment. It is designed in particular for flare radiation monitoring and activation of alarm systems. The design is certified for use in an explosive environment, and can cope with radiation levels up to 15.000 W/m2. Hukseflux recommend use of HF02 as a qualitative measurement, and not as a tool for decision making or safety, but always combined with single source. 90 10 5 Figure 1 HF02 overview: HF02 consists of a sensor (1) with both temperature and heat flux output, a body (3), a radiation screen (2) and radiation / rain screen (10) to protect the sensor against the environment, a mineral insulated cable (4), potting (5), a plastic cable (6), mounting holes (3/8 UNC) (9) and spacers (11). Area 8 must be between -20 and +70 degrees C, and area 7 must be certified according to the area of installation of the connection box, both within the responsibility of the user. All dimensions are in mm. INTRODUCTION HF02 is intended to be used as a sensor in alarm systems in case of possible high thermal radiation exposure. A typical application is close to flares. A common assumption is that the heat flux level for a safe environment for personnel must not exceed 5 kW/m2 (or 1500 BTU/hr ft2), or otherwise an alarm is activated. The rain- and radiation screen act to locally reduce the effect of wind, preventing the false indication of a safe situation. Rain on the detector can also lead to cooling and a reduction of the measured flux. This again could lead to a false indication of a safe situation. The rain screen will in most cases prevent this from happening. A typical alarm system will include multiple sensors, each aimed at the main source of radiation. To perform a representative measurement, the sensor temperature should be as close as possible to ambient temperature. A secondary purpose of the radiation screen (in combination with cooling fins) is to reduce heating of the sensor. The sensor in HF02 will measure the heat flux to the black (fully absorbing) surface of the sensor itself. It thus provides a reasonable measure of the worst-case effective exposure for personnel and equipment from the particular direction that the sensor aims at, at the location of the sensor. As the detector is essentially open (no windows) the measurement is influenced by wind in much the same way as any exposed surface; increased wind reduces the effective exposure and leads to reduced measured flux. (Continued on the next page) V ers io n 1003 (page 1 of 2 ) Huks ef lux re serv es th e r ig ht to alter s pec if ic atio ns w ithout pr ior no tic e HUKSEFLUX™ THERMAL SENSORS. WWW.HUKSEFLUX.COM . INFO@HUKSEFLUX.COM

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HF02 - 2

HF02 INTRODUCTION (CONTINUED) It can be debated if compensation or correction of the measurement for the influences of solar radiation is necessary. As the maximum solar radiation level is about 1.3 kW/m2, it is certainly significant. It is however not part of the source that is usually monitored. On the one hand the safety is determined by the total heat flux that personnel or material is exposed to. On the other hand the determination of the contribution of solar radiation is virtually impossible because the solar source is moving. Solar radiation might therefore have its maximum in a...

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