Heat Flux Sensors of HFx series
Heat Flux Sensors of HFX series – the series of high sensitive and self- calibrating miniature sensors for conductive, convective and radiation heat fluxes. The Sensors are developed as a series of a range of sizes: 7×7, 12×12, 17×17 amd 22×22 mm2. Optional dimensions (size and thickness) as well as customized performance parameters are available on request. The Sensors were developed for measurement of conductive, convective and radiation heat fluxes in a wide range of heat flux intensities. The high sensitivity of the Sensors of the series provides accurate experiments and data on objects of investigations.
One of the feature of the Sensors is the self-calibration method (patent pending RU2014145948 dated 17.11.2014). It means possibility to calibrate precisely the Sensor by measurement of its thermoelectric performance parameters. It is not necessary to remove it and send to labs.
The calibration procedure is possible with use of Datalogger device of the DX8140 series, specially developed for thermoelectric Heat Flux Sensors, or by use of Z-meters. The calibration procedure is described in HTx Sensors Manual, Chapter 9.
HEAT FLUX SENSORS HFX SERIES KEY ADVANTAGES
The Heat Flux Sensors of the HFX series – the series of high sensitive and self-calibrating miniature Sensors. The Sensors were developed for measurement of conductive, convective and radiation heat fluxes in a wide range of intensities.
The Sensors have a square shape. Electric connections come from the parts by a miniature FEP Flat Ribbon Cable (0.025” Pitch, 32 AWG). The standard length is 180 cm (6”). The cable output is ended by a six-pin miniature connector of the type DFMC 0,5/ 6- ST-2,54 (Phoenix). Both sides of the Sensors are ceramics (AlN) covered with black paint stable for working in wet ambient and even under water.
Internal ambient of the Sensor is potted by a silicon compound of high temperature stability.
Specification
| Product name | Units | HFD03-032-05L07 | HFD03-128-05L12 | HFD03-288-05L17 | HFD03-512-05L22 |
| Detector Type | Thermoelectric | ||||
| Surface material | Aluminum, painted black | ||||
| Protection2) | IP67 | ||||
| Surface dimensions AxB | mm2 | 7x7 | 12x12 | 17x17 | 22x22 |
| Sensing area | mm2 | 49 | 144 | 289 | 484 |
| Thickness H | mm | 2.3 | 2.3 | 2.3 | 2.3 |
| Pellet pairs | 32 | 128 | 288 | 512 | |
| Sensitivity S e | uV/(W/m2 ) | 25 | 95 | 210 | 375 |
| Integral sensitivity S a | V/W | 0.56 | 0.66 | 0.74 | 0.78 |
| Heat Flux Range P e , ± | W/m2 | 4500 | 5000 | 5500 | 5500 |
| Integral Heat Flux Range P a , ± | W | 0.2 | 0.8 | 1.6 | 2.7 |
| Thermal Time Constant t | s | 2.6 | 2.4 | 2.2 | 2.2 |
| Thermal Resistance R T | K/(W/m2) | 0.00209 | 0.00182 | 0.00181 | 0.00179 |
| Integral Thermal Resistance R T | K/W | 42.7 | 12.6 | 6.3 | 3.7 |
| Electrical Resistance ACR | Ohm | 3.6 | 14.2 | 32 | 56.9 |
| Temperature Dependence3)dS/dT | %/°C | 0.25 | 0.25 | 0.25 | 0.25 |
| Linearity with Power dS/dP, ± | %/(W/m2) | 0.000523 | 0.000455 | 0.000452 | 0.000447 |
| Homogeneity dS/dA, ± | % | 1 | 1 | 1 | 1 |
| Calibration Accuracy, ± | % | 3 | 3 | 3 | 3 |
| Calibration Temperature Range | °C | -40 … +85 | -40 … +85 | -40 … +85 | -40 … +85 |
| Operating Temperature Range | °C | -50 … +150 | -50 … +150 | -50 … +150 | -50 … +150 |
| Max. compressive force for clamping | kg | 3 | 12 | 26 | 46 |
| Integrated thermistor | no | ||||
| Cable4) Length L, | cm | 180 | 180 | 180 | 180 |
| Connector5) | FMC 0,5/6-ST-2,54-18211355 | ||||
1)Performance data shown in specifications are given for ambient temperature Ta=300 K (27 °C)
2)Application in water - not more than 1 hour. Maximal temperature 100°C
3)Average value. Detailed temperature dependence is given in table
4)Sensor is equipped with thin FET cable 1.8 m, standard length.
5)Cable is ended (optional) by miniature connector FMC 0,5/6-ST-2,54-18211355. The female part - MCV 0,5/6-G-2,54 SMD R44-1821588