EKO HF-10S Інструкція з експлуатації - Сторінка 11

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5-3. Measurement

1. Data Collection

For typical measurements, the output of the heat flow sensor is very small; therefore, selecting an appropriate
measurement device, such as a data logger is critical (in a typical indoor measurement, the heat flow is
generally less than few a dozen W/m
to a few hundred μV; thus it is ideal to have more than 10μV for the minimum resolution on the measuring
device).
Although it depends on the installed location, there are large fluctuations in heat flow sensor output, thus an
average or an integration value of a certain interval is used instead of using an instantaneous value.
It is important to select a measurement device which is suitable for the above purpose.
2. Measurement
By using the following equation, calculate the heat flow from the output voltage of the sensor.
Q = E / K
Where:
Q:
Heat flow flux
E:
Output voltage from a sensor
K:
Sensitivity of the sensor
 Important Points of Measurement:
All of the Heat Flow Sensors are made of thermal resistive elements; therefore, the heat resistance of
the object to be measured must be sufficiently larger than the Heat Flow Sensor, or it will cause an
error.
The table on the following page shows the examples of wall materials and measurement
errors. Also, when the Heat Flow Sensor is attached on a surface, the convective flow by the air current
and radiation of the surrounding area will cause a measurement error.
EKO INSTRUEMTNS CO., LTD. Heat Flow Sensors Instruction Manual Ver.7
2
).
The output from this heat flow sensor would be from a few dozen
[W/m
2
]
[mV]
[mV/W・m
-2
]
Pg. 10