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THERMOELECTRIC HEAT FLUX SENSORS

Page 20 of 36

DATA ACQUISITION

The HTX Heat Flux Sensors’ output is an analog voltage signal. Depending

on the measurement task, the voltage signal can be in the μV to mV range.

To read-out the Sensor signal, three options are available: the DX8140

Datalogger, a voltmeter, or a third party read-out device. The following

section describes each option separately.

7.1 Datalogger DX8140

The DX8140 Datalogger is specifically developed for reliable and

straightforward heat flux measurements in combination with the HTX and

HFX Heat Flux Sensors. The DX8140 Datalogger works as a complete

solution with included software. The DX8140 Datalogger can be set to

measure either an analog voltage signal (in V) or heat flux signal (in W/m

2).

Please follow the Instruction Manual, which is available for the DX8140

Datalogger.

Applicability

The DX8140 Datalogger is compatible with all HTX Heat Flux Sensors with a

plug.

7.2 Voltmeter as a read-out device

Voltmeters are used for simple measurement tasks and/or for Sensor

functionality tests. In order to read the output voltage of the Sensor with

high accuracy, you need a voltmeter with high resolution. The resolution of

the heat flux measurement is limited by the voltmeter resolution and

noise. Table 1 demonstrates the relevance of voltmeter resolution.

The voltmeter resolution is the most critical feature when choosing the

optimal device. Due to the low electrical resistance of the Sensor, there

are no special requirements regarding the input resistance of the

voltmeter.

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