The HFM1 Heat Flux Meter 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. For ISO 9869 and ASTM C1155 / C1046 standards, the HFM1 is equipped with two Heat Flux Plates (HFP01) as well as two pairs of matched thermistors for differential temperature measurements (four total thermistors).
Thermistor excitation voltage is measured at every measurement interval for increased accuracy, this voltage reading is used in the thermistor scripts to remove errors introduced from possible voltage fluctuations.
- building physics
- H-value and R-value determination
- building climate control
|Analogue Channels||6 Single Ended (SE) and 2 Differential (channel 1 of 10 total is 2.5V thermistor excitation measurement)|
|Minimum Logging Interval||1 second|
|Delayed Start||Suspend Logging, Customised Intervals|
|Test method||ISO 9869 and ASTM C1155 / C1046|
|Differential temperature (DeltaT)||matched pairs calibrated thermistors, Part Number THERM-SS-10 and THERM-SS-30.|
|Heat flux sensor||type HFP01|
|Protection: sensors and logger||IP 65|
|Cable length||30m and 10m (Thermistors), 10m (HFP01)|
|Storage capacity||Micro SD card, expandable up to 16GB, 4GB microSD card included.
> 30 days of data.
|Data analysis||to be performed by the user according to ISO and ASTM standards|
|Internal Battery Specifications|
|960mAh Lithium Polymer, 4.20 Volts fully charged|
|External Power Requirements|
|Bus Power||8-30 Volts DC, non-polarised, current draw is 190mA maximum at 17 volts per logger|
|USB Power||5 Volts DC|
|Internal Charge Rate|
|Bus Power||60mA – 200mA Variable internal charge rate, maximum charge rate of 200mA active when the external voltage rises above 16 Volts DC|
|USB Power||100mA fixed charge rate|
|Internal Power Management|
|Fully Charged Battery||4.20 Volts|
|Low Power Mode||3.60 Volts – Instrument ceases to take measurements|
|Discharged Battery||2.90 Volts – Instrument automatically switches off at and below this voltage when no external power connected.|
|CH24 Power Supply is supplied in the HFM1 package.|
|Battery Life varies|