Heat Flow Plates

Universal applications

General description:
Suitable for determination of the thermal flux density in a range up to 150°C. Heat flow plates must be homogenously coupled with the test object. For attachment, e.g. to a crooked or rough surface, either thermally conducting paste, Vaseline, silicone adhesive or double-sided adhesive tape is used as required.

Technical features:
Heat flow plates consist of a meander of many duplex-connected thermocouples which are imbedded in a supporting material. If the material is thick, the plates are constructed in such a way that there is sufficient edge next to the meander, which prevents a lateral deviation of the heat flow. The heat flows always refer to the surface covered by the meander and form its average value.

Measuring principle:
When the heat flow plate is placed on the metering point to be tested, it forms a thermal resistance to the heat flow. While the heat flow is passing a temperature gradient, proportional to the thermal flux density, is generated in the thickness of the plate.

Calibration value:
A calibration value is assigned to each heat flow plate, which correspond to the thermal flux density in W/m if the plate generates 1 mV. The calibration value is programmed out of works in the ALMEMO® connector. By this, the actual heat flux density in W/m2 is displayed when using ALMEMO® instruments.

Heat Flow Plates Technical Data / Ordering Chart (FQ 90xx-x)
Type	Application	Dimensions (mm)	Meander size (mm)	Supporting material	Treshold sensitivity (W/m)	Thermal stability (-20°C to)	approx. cal. val. (W/m2 1 mV)	Acc. of cal. val. (%, 25°C)	Order No.
117	for smooth surfaces, e.g. window sections	100 x 30 x 1.5	80 x 20	epoxy resin	0.5	80	30 - 50	5	FQ A017 C
118	for universal applications, e. g. solar systems and insulated plates	120 x 120 x 1.5	100 x 100	dto.	0.2	80	10 - 20	4	FQ A018 C
119	especially suited for the construction industry, masonry,  insulated plates and old buildings	250 x 250 x 1.5	180 x 180	dto.	0.1	80	2 - 8	3	FQ A019 C
120	small heat flow plates, e.g. for medical use and electronic parts	33 Ø x 1.5	20 Ø	dto.	0.5	80	40 - 60	5	FQ A020 C
117SI	flexible heat flow plate, well suitable for smooth surfaces, e.g. window sections	100 x 30 x 3	80 x 20	silicone	0.5	80	30 - 50	5	FQ A017 SI
118SI	flexible heat flow plates, well suitable for smooth surfaces, e. g. solar systems and insulated plates	120 x 120 x 3	90 x 90	silicone	0.2	80	10 - 15	4	FQ A018 SI
150-1	flexible heat flow plate, especially suitable for high temperatures, e. g. masonry, insulated boilers and pipes	180 x 100 x 0.6	170 x 90	Teflon	1	150	50 - 80	4	FQ A080 1H
150-2	especially suitable for high temperatures, e. g. construction industry, walls and insulated plates	500 x 500 x 0.6	490 x 490	Teflon	0.1	150	5 - 10	3	FQ A080 2H

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