Cooled heat flux transducers - CHF Series
Download the technical datasheet:
CHF sensors are liquid-cooled by an internal heat exchanger fed by a remote thermostatic circulating bath (thermocryostat) connected by two insulated flexible hoses. Internal exchanger allows the backside of the sensor to be perfectly maintained at a set-point temperature, even for the most elevated heat flux (>10MW/m²). Length of flexible hoses can be adapted to your application up to a few dozen meters. Their thermal insulation is achieved by a multilayer sheath made of a silicon-coated fiberglass core. CHF sensors are equipped with fast connectors for easy dismounting of the cooling circuit
Product details
Sensors of the CHF (Cooled Heat Fluxmeters) series are intended for long duration measurement or continuous thermal monitoring. CHF devices are derived from the IHF series, and are characterized by an optimized circulation cooling system integrated in the sensor body. CHF sensors can be declined in radiative (radiometers), convective and total fluxmeters. They are supplied with a dedicated thermostatic circulating bath.
CHF sensors are characterized by a continuous measurement capability, allowing thermal heat flux monitoring in industrial processes (e.g. power generation, fluidized bed, fluid flow, heat exchanger, burners, etc.), but also where usual IHF sensors reach their duration limit (see IHF series datasheet for more information). A single configuration can cover a wide range of heat flux measurement needs, from “low” intensities (some kW/m²) up to ultra-high flux (>10MW/m²). Nevertheless, some applications needs more time-resolution, which in turns require low rise-time. To achieve this, three standard models are available with different sensitive element thicknesses, ranging from 2mm to 6mm thickness. Three version are also available:
- In their convection-type version, the sensitive element of the sensor is made of a highly reflecting surface treatment (emissivity <0.05) in order to suppress any radiative contribution ;
- In their radiation-type version (radiometers), the sensitive element of the sensor is isolated from the external environment by the means of a window, so as to suppress any convective contribution. Window transmissivity in characterized in our laboratory over a large spectrum. In that case, the sensitive element is made of a highly absorbing surface treatment (emissivity >0.95), also spectrally characterized ;
- In their total-type version, the sensitive element is analogous to the radiation-type version, but directly exposed to the external environment so as to catch combined radiative-convective heat transfers. If convection can be neglected in your application, this version can be turned into a large view angle radiometer.
CHF Series heat flux transducers are available in two standard mechanical configurations (threaded and flange mounted), but Nextherm can provide tailor designed units.
