HTX datasheet(14/36 Pages) RMT

14 / 36 page

THERMOELECTRIC HEAT FLUX SENSORS

Page 14 of 36

Checking of the Figure-of-Merit requires a special device – Z-Meter.

DX8140 Datalogger. It has a special function of Figure-of-Merit checking.

Contact RMT for the devices and checking. And visit RMT website for more

literature on checking of Figure-of-Merit of thermoelectric modules -

http://rmtltd.ru/technology/publications/.

The specification of every Sensor contains Z measured at vendor factory

before shipment.

5.3 Checking Pt1000 thermistor

Electrical resistance testing is done using a standard multimeter via a two-

wire probe resistance measurement.

The resistance must be in the range specified in the Sensor’s respective

datasheet. These values include the resistance of cables. Resistance below

0.5 ohm indicates a short circuit, while a resistance higher than the value

stated in the datasheet indicates physical wearout of the Sensor and/or its

cables. In both cases, the Pt1000 thermistor is not functional.

5.4 Checking of Sensor behavior

Connect the Sensor to a voltmeter (resolution preferably in the 0.1mV

range). Place the Sensor on a metallic surface at room temperature. When

touching the Sensor with a warm finger on the upper surface, you should

get a signal in the mV range.

A Sensor signal below 0.1 mV indicates a short circuit. Check whether the

resistance of the Sensor is > 0.1 ohm as described above.

If the signal randomly fluctuates between a positive and negative signal, or

the voltage is in the +/- 1 V range, you may have an open circuit. Check the

connection of your electrical probes.

If the signal shows one of the three described features above, the Sensor is

not functional and has to be replaced.

In this case, please contact the vendor.

HTX Datasheet(PDF) 14 Page - RMT Ltd.