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High accuracy thermal resistance measurement system with 2 measurement locations.
TRSYS01 is a measurement system for analysis of thermal resistance and thermal transmittance of building elements by in-situ measurement. It can be used for measurements according to ISO 9869 and ASTM C1155 / C1046 standards. In its standard configuration the system is equipped with two heat flux sensors as well as two pairs of matched thermocouples for differential temperature measurements.

Contact person:

Eleni Apostolidou
tel. (+30) 2510462225
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The in-situ measurement of thermal resistance, thermal transmittance or U-Values of buildings is often applied in studies of building elements. The thermal resistance, TR, measurement is based on simultaneous measurement of time averaged heat flux (using a heat flux sensor).


The ISO and ASTM standards on the subject comment on applicability of the method, on installation and on data analysis. The TRSYS consists of high accuracy electronics (measurement accuracy up to 1 microvolt) as well as matched thermocouple pairs to make a differential temperature measurement with a total accuracy of better than 0.1 degrees C. It also includes HFP01 heat flux plates. HFP01 is the world’s most popular sensor for heat flux measurement through building envelopes. 




Test method


ISO 9869 and ASTM

C1155 / C1046

Measurement locations

2 (can be increased on request)


Power requirements

110-220 V, 0.5 Watt (max)


Differential temperature (∆T)

matched pairs thermocouple type

KX, 584.3:1989

Heat flux sensor: 


type HFP01


Cable length: 


20 m (3x) and 10 m (3x)


Storage capacity

> 30 days of data:

10 minute and 24

hour averages