HTX datasheet(28/36 Pages) RMT

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THERMOELECTRIC HEAT FLUX SENSORS

Page 28 of 36

SELF-CALIBRATION PROCEDURE

9.1 Method

Sensitivity of thermoelectric Heat Flux Sensor Sa:

�� =

��

= �� × �� × ��

(10.1)

where U – Sensor signal at total heat flux Pa; N – number of

thermoelement pairs in the Sensor; S – sensitive surface area; RT –

thermal resistance of Sensor ;  – averaged Seebeck coefficient for

pair of n- and p-type thermoelements.

Figure-of Merit Z of thermoelectric Sensor

�� =

(�� × ��)2 × ��

��

(10.2)

where ACR – AC resistance of the heat fux Sensor.

The calibration expression with use of Z, ACR and Seebeck coefficient

are the following

�� =

�� × ��

(10.3)

�� = �� × �� =

�� × ��

(10.4)

where S – sensitive surface area.

Thus, according to the formulas (10.3-10.4) the sensitivity calibration of

the thermoelectric Heat Flux Sensor is available with use:

Construction parameters of the Sensor: number of pellets pairs N;

and size of sensitive surface S. The parameters are given in

datasheets and Specifications (Chapter 3. Specifications);

HTX Datasheet(PDF) 28 Page - RMT Ltd.