Specifications
HFS01
| Measurand | heat flux, temperature |
| Measurement range | 0 to 800 x 10³ W/m² |
| Measurand in SI units | heat flux density /irradiance in W/m² |
| Heat flux sensor | thermopile |
| Temperature sensor | thermocouple type K |
| Sensitivity (nominal) | 9 x 10⁻⁹ V/(W/m²) |
| Calibration traceability | to SI units |
| Rated operating temperature ranges | |
| sensor and black coating | -30 to +650 °C |
| high-temperature cable | -30 to +900 °C |
| low-temperature extension cable | -30 to +240 °C |
| IP protection class | IP67 |
| Standard cable lengths | |
| high-temperature cable | 1 m (see options) |
| low-temperature extension cable | 3 m (see options) |
| Rated cooling water temperature range | 10 to 30 °C |
| Rated cooling water flow | > 30 l/h (0.01 l/s), preferably 100 l/h (0.03 l/s) |
| Output signal | DC voltage |
| Output signal range | 10 x 10⁻³ V at rated measurement range |
| Spectral range | 0 to 50 x 10⁻⁶ m |
| Full field of view angle | 180° |
| Black coating emissivity | 0.92 (estimate) |
| Order code | HFS01 - high-temperature cable length in m - low-temperature extension cable length in m |
Options
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HFS01 measures heat flux in the range of (0 to 800) x 10³ W/m²; the extremely high fluxes as generated by flames and solar concentrators.
Equipped with a black absorber, the instrument is designed for measurement in an environment in which heat flux includes radiation as well as convection. HFS01’s thermopile sensor generates an output voltage proportional to the total absorbed heat flux. The sensor must be water-cooled. Water cooling is usually supplied by tap water. A removable flange that can be used for mounting is supplied with the sensor. Also, a type K thermocouple is included, to measure the sensor body temperature.
The part of the cabling closest to the sensor is a special high-temperature metal sheathed cable with an interlocked spiral stainless steel armour. The high-temperature cable and armour withstand temperatures up to 900 °C. Because the sensor body is water cooled, it will remain relatively cool. The surface temperature of the sensor may reach 650 °C. The low-temperature extension cable has a jacket of PTFE type plastic.
The HFS01 sensor can also be ordered without black coating, so that HFS01’s absorption of radiation is reduced, while it remains sensitive to convective radiation. Users may also coat HFS01 with their own coating, to create a different response to radiation.
HFS01 has several advantages:
- very robust all-metal / ceramics instrument body and sensor
- high-temperature signal cable
- signal wires electrically insulated from the sensor body and from cooling water
Using HFS01 is easy. It can be connected directly to commonly used data logging systems. The heat flux, in W/m², is calculated by dividing the HFS01 output, a small voltage, by the sensitivity. The sensitivity is provided with HFS01 on its product certificate. Equipped with heavy-duty cabling and a fully stainless steel casing which prevents moisture from penetrating the sensor, HFS01 has proven to be very reliable.
HFS01 calibration is traceable to international standards. The factory calibration method follows the recommended practice of ASTM C1130-07 (2012).
Suggested use
- solar concentrators
- flame research
- fluidised beds
HFS01 high heat flux sensor
- robust all-stainless steel body
- high-temperature signal cable
- signal wires electrically insulated from the sensor body and from cooling water
