Envco – Environmental Equipment

Suggested Use
• Meteorology
• Building physics
• H-value and R-value determination
• Building climate control

Using HFP01 is easy. For readout one only needs an accurate voltmeter that works in the millivolt range. To calculate the heat flux, the voltage must be divided by the sensitivity; a constant that is supplied with each individual instrument.

HFP01 can be used for in-situ measurement of building envelope thermal resistance (R-value) and thermal transmittance (H-value) according to ISO 9869, ASTM C1046 and ASTM 1155 standards.

Traceability of calibration is to the "guarded hot plate" of National Physical Laboratory (NPL) of the UK, according to ISO 8302 and ASTM C177.

A typical measurement location is equipped with 2 sensors for good spatial averaging. If necessary two sensors can be put in series, creating a single output signal.

Heat flux sensor specifications:
Nominal Sensitivity 50 μV/Wm2
Nominal Resistance 2 W
Temperature range -30 to +70 °C
Sensor thermal resistance < 6.25 10-3 km2/W
Range -2000 to +2000 W/m2
Calibration traceability NPL, ISO 8302 / ASTM C177
Expected typical accuracy (12 hr totals) within +5%/-15% in most common soil, within +5%/-5% on walls

If measuring in soil, in case a more accurate measurement is needed the model HFP01SC should be considered.

Ordering Information
HFP01 Heat flux plate

Options
Additional cable length x metres (add to 5m)
AC100 amplifier
LI 18 hand held readout.