The NF01 needle type heat flux and temperature sensor is used for monitoring in high temperature environments, typically in walls and shells of blast furnaces and smelters. Measuring heat flux as well as temperature with one sensor is more accurate and practical than using distributed temperature measurements. The same technology is used to manufacture heat flux sensors for different applications.
NF01 is used for measurement of the energy balance of industrial blast furnaces and smelters, in steel shells as well as in the graphite and brick refractory. It has been applied successfully in iron furnace emergency response systems and in smelters for titania slag production. The sensors inside NF01, a thermopile and a thermocouple, are protected by a fully sealed stainless steel “needle” body. The needle can withstand temperatures up to 700°C, as well as the aggressive chemical environment of a furnace. Optionally the sensor temperature range can be extended to 1000°C. The cable is made of PVC. 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)|
|Sensitivity (nominal):||2 x10⁻⁶ V•m/K|
|Heat flux sensor:||thermopile|
|Temperature sensor:||thermocouple type K|
|Needle length:||specified by the user|
|Needle diameter:||8 x10⁻³ m|
|Needle diameter optional:||4 x10⁻³ m|
|Sensor design:||swaged SS 310 sheath|
|Rated measurement range:||0.05 to 50 x10³ W/m² (typical)|
|Rated Operating Temperature Range:|
|-Sensor:||-30 to +700°C|
|-Sensor optional:||-30 to +1000°C|
|-Cable:||-30 to +85°C|
|Standard cable length:||10 m (see options)|
|Design:||user-specific: in cooperation with the user for the specific application|
|Installation:||see the manual for recommended parts for installation|