HFX datasheet(21/36 Pages) RMT

21 / 36 page

OPERATING MANUAL. HFX SERIES

Page 21 of 36

DATA ANALYSIS

This section contains the basic analysis methods needed to interpret data

from the HFX and HFX Heat Flux Sensors. All the information necessary for

it can be found in the following documents:

Specifications. The Specification is delivered with every Heat Flux

Sensor for R&D Applications. It contains the Sensor sensitivity Se0

[V/(W/m

2)] and integral sensitivity Sa

0 [V/W] at calibration

“standard” temperature T0, and all correction factors that are

needed to increase accuracy of the results.

Datasheet. The datasheet provides an overview for all technical

parameters of HFX Heat Flux Sensor. It also states the Sensor area,

which is necessary for calculating heat flux.

8.1 Temperature corrections

The sensitivity of the thermoelectric Heat Flux Sensors depends on the

temperature at which they are used. For thermoelectric Heat Flux Sensors

of the HFX series averaged temperature dependence of 0.25%/°C is given

in the Specifications and Datasheets (Table 9.1). The standard calibrated

Sensitivity is given in the specification at temperature 300K (27°C) which is

selected as “standard”.

Thus, if using the Sensors at temperatures below or above 300K (27°C),

with every degree of Centigrade accuracy becomes worse by 0.2-0.25% per

degree.

For temperature range close to the “standard” temperature, i.e. +/-1 °C,

the inaccuracy of the measurements in the general case is negligible –

about ±1%.

But for a wider range of temperatures and for precise measurements the

temperature corrections are recommended.

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