HTX datasheet(24/36 Pages) RMT

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THERMOELECTRIC HEAT FLUX SENSORS

Page 24 of 36

It is easy to obtain them as for all thermoelectric Heat Flux Sensors of RMT

the temperature dependences are investigated and general formulas are

advised in the Specifications and Datasheets.

The temperature dependence of sensitivity is given as a polynomial of the

3-rd order:

�� = ��0 × [(A2 × (�� − ��0 )2 + A1 × (�� − ��0) + A0)]

(9.1)

where ��0- is always =1; ��0 - sensitivity at “standard” calibration

temperature

��0 (= 300��); �� – sensitivity at working

temperature ��.

In the expression (9.1) value in brackets is a temperature correction factor.

��(��) = [(A2 × (�� − ��0 )2 + A1 × (�� − ��0) + A0)]

(9.2)

Sensitivity Se [mV/(W/m

2)] is also given in the Sensor Specification

(Chapter 3. Specifications) and it correlates with the integral sensitivity Sa

[V/W] as

�� = �� × ��

(9.3)

where �� – sensitive surface of the Heat Flux Sensor.

Thus the temperature correction factor ��(��) is the same for both

sensitivities

�� = ��0 × ��(��)

(9.4)

�� = ��0 × ��(��)

(9.5)

The coefficients of the polynomial expression are common and are given in

the Datasheet of the Heat Flux Sensor series (table 2).

Table 9.1. Polynomial expression of temperature dependence of Sensors

sensitivity

HTX Datasheet(PDF) 24 Page - RMT Ltd.