HTX datasheet(29/36 Pages) RMT

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OPERATING MANUAL. HTX SERIES

Page 29 of 36

Property of thermoelectric material of the Sensor  (Seebeck

coefficient). This parameter measured at standard temperature is

given in the Sensor Specification. Moreover, temperature

dependence of the parameter is also given in Specifications and

datasheets (Table 10.1).

Measurement of Figure-of-Merit Z and AC Resistance ACR of the

Sensor. The measurements can be done with use of DX8140

Datalogger or Z-meters of RMT, any model.

That is really a self-calibration method as it does not require any external

heat source. And it can be done at the user setup.

Table 10.1 Averaged (for pair of n- and p-types pellets) Seebeck coefficient

of thermoelectric Sensors

Typical value

a0, мкВ/К

T0, K

410

+1,291E-03

-8,647-06

+7,843E-08

300

Temperature range -40…+80 °С

Common formula

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

9.2 Measurement Scheme

The self-calibration is made by measurement of Figure-of-Merit and ACR

resistance of thermoelectric Heat Flux Sensor by the four-wire method

which is provided by four wires of the FET cable connected to the Sensor.

Fig. 10.1 Connection scheme for self-calibration procedure.

HTX Folha de dados(PDF) 29 Page - RMT Ltd.