The NF02 Miniature needle type heat flux and temperature sensor is a small version of model NF01, and is typically used in (injection) moulds. Measuring heat flux as well as temperature with one sensor is much more accurate and practical than using distributed temperature measurements. The same technology is used to manufacture heat flux sensors for different applications.
NF02 is used for monitoring the energy balance of industrial installations, in particular in steel moulds. The sensors inside NF02, a thermopile and a thermocouple, are protected by a fully sealed stainless steel “needle” body. 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 sensor as well as the high temperature cable and armour withstand temperatures up to 450°C. Optionally the sensor and cable temperature range can be extended to 700°C. The low temperature extension cable is made of PTFE. The sensor outputs are heat flux (an analogue voltage signal in the millivolt range) and temperature (using a thermocouple type K). The user must know the thermal conductivity of the surrounding material to calculate the heat flux.
The usual approach to measurement of heat flux is to estimate it from distributed temperature measurements. This leads to large measurement errors and is not practical.
|Measurand:||Heat Flux, Temperature|
|Measurement Range:||0.05 to 50 x10³ W/m² (typical)|
|Heat flux sensor:||thermopile|
|Temperature measurement:||thermocouple type KX|
|Needle diameter:||3 x10⁻³ m|
|Rated Operating Temperature Range|
|-Sensor and high temperature cable:||-30 to +450°C|
|-Sensor optional (no spring):||-30 to +700°C|
|-Low temperature extension cable:||-30 to +240°C|
|Standard Cable Lengths|
|-High temperature cable:||0.1 m (see options)|
|-Low temperature extension cable:||2.5 m (see options)|
|Product order code:||NF02/L1/L2/L3 L1 to L3 in x10⁻³ m|
|Design:||user-specific: in cooperation with the user for the specific application|