Heat Transfer U-co-oefficient

STM210U – set for measurement of Heat Transfer U coefficient (includes the U COEFFICIENT MODULE)

The STM210U is supplied as a set.
It features a backlit digital display, 4-channel temperature module for thermocouple K/J/T (-200 to +1300°C), 2 PT100 channels (-100 to +400 °C) and it is supplied with: 3 FK-PFA-2-MM thermocouple wire probes, 1 SKA110 ambient thermocouple probe, 1 PT100 wireless ambient probe, 1 CE200 protection cover, fixing paste, 5 calibration certificates (one with each probe) with 3 points each, transport case.

The STM210U thermometer can display simultaneously :
U coefficient
External temperature (°C)
Surface temperature of wall face (°C)
Ambient temperature (°C)

The U coefficient is the most important value for the evaluation of construction elements thermal features.
To calculate U coefficient, 3 temperature values are needed : the outside temperature, the surface temperature of the wall face, ambient air temperature. The wireless probe allows to determine the outside temperature easily and quickly when windows are closed. The probe is directly positioned outside and transmits the measurement value to the STM210U instrument trough the wireless system.
The two others necessary values are determined with three thermocouple wired probes fixed to the wall face thanks to the fixing paste and to the thermocouple probe of ambient temperature of the room, connected to the module of STM210U instrument.

Once the three required temperatures are transmitted to STM210U, the device calculates and displays U coefficient.

Module Coefficient U with 3 wire Thermocouple T probes, length 2m, 1 integrated ambient probe, Smart-2014 recognition system.

U coefficient module allows to calculate the thermal transmittance coefficient of a wall (U coefficient) thanks to the average of 3 contact temperature probes, the T thermocouple ambient temperature and the measurement of external temperature (manually entered or measured by a wireless temperature probe). U characterises the quantity of heat that goes through a wall in continuous operation. It is a key point to determine thermal leak. So it allows to estimate the insulation of a wall : the lower the value, the more insulated the wall.

For building renovations, this coefficient is one of the most important values to estimate the their loss and their energy use.

Operating principle :

To estimate the thermal resistance of a wall, the outside temperature (Te), the room temperature (Ti) and the inside surface temperature of the wall must be measured. If

measurement conditions are respected, these 3 temperatures, by way of an empirical formula, gives the U value of thermal transfer of a wall and so its total thermal resistance Rt (U=1/Rt).

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