The short wavelength high performance pyrometer with wall mounting monitors temperature of metal inside the reheating furnace and ensures slabs are optimally heated. Direct temperature measurement of metal is made possible with option to have a video view of the inside of the furnace. |
Measuring temperature inside metal in Reheating Furnace
Accurate temperature measurement of Runner stream
- 500nm short wavelength of sensor minimize influence of changing emissivity of hot metal
- 1000-2000°C instrument measuring range
- 3 options available: Portable, Fixed Type and Thermal Camera
- Plug and play system that works in high dusty environment
Application and Pyromter installation photos
Challenges
- Fast and accurate temperature measurement
- Traces of slag present on the top surface
- Changing emissivity of hot metal
- High dusty environment
Solution
- Pyrometer selected with a very short wavelength at 500nm to reduce the influence of emissivity adjustment
- Peak-hold functionality holds the maximum temperature, which is of hot metal as the slag is typically lower temp
- Accessories:-
- 300mm pipe to prevent dust accumulation on the lens
- Air purging collar
- Water cooling jacket (nitrogen air can also be used)
- Multi-colour (red, green and yellow) LED display along with junction box
Technical Specifications
- Measuring range: 1000-2000°C
- Spectral range: 500nm
- Resolution: 150:1
- Response time: 1ms
- Accuracy: 0.3% of reading + 2°C
Optris: Thermal camera for Multiple temperature
points and visualisation in control room
Products and Accessories
Case Study Number
- TP3
Challenge
- The increasing flexibility of production lines requires a high adaptability of sensors. Continually changing object geometries, different temperatures and very high radiation or surrounding temperatures are no rarity.
- In a pilger mill those rough conditions can be found, among others in the production of seemless steel pipes. The raw steel blocks, each weighing a few tons are heated up first in a round oven at a temperature of 1300 °C.
- After descaling of the surface, the steel block is prepunched in a hole press with a strength from a converted 2000 t. In the next sloping rolling mill the growing pipe rotates between two rollers that are positioned at an angle to each other. The punching is widened to the size of the mandrel diameter.
Previous solution / Competitor product
- N/A
Solution
- The sensor that was installed at this application is the HMD OKA 2038.38 G with tube OL 19.
- The signal of the infrared sensors controls the movement of centering device and abutment. The point of view is restricted by the tube and prevents disturbances by steam in the cooling phase.
- An optimum adaptation to the operating conditions is given due to the adjustable response temperature. The HMD with self-learning response temperature (Auto-Teach function) is suited to continually changing conditions.
- The compact sensor with a stainless steel housing can withstand surrounding temperatures of up to 75° C. The use of a cooling jacket raises this up to 200° C.
- Alternatively sensors with fibre optic cables are available which permit an application at ambient temperatures up to 600° C without cooling.
Customer Benefits
- Maintenance-free
- High temperature stability
- Recognition of hot objects at big distances
- Self adjustment with Auto-Teach or step switch for the response temperature
Product Part number
- OKA 2038.38 G
Brand
- Proxitron
Accessories
- Piros swivel stand HM2
- Tube OL 19
- Pilot light unit (for alignment) DAK 308 + OL 26
- Different cable lengths (e.g. 15 m)
Customer Testimonial
compared to previous solution or competition
Case Studies
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