High rejection rate due to inaccurate temperature. Due to moving process difficult define measuring point, where the temperature has to measured. Thermal camera provides multiple ROIs (areas) for full profile measurement. Auto HOT SPOT tracker for max process temperature.
Home Case Studies Accurate Temperature measurement in Induction Heating using Ratio Pyrometer
Accurate Temperature measurement in Induction Heating using Ratio Pyrometer
Pilger mill in tube rolling mills - hot and cold pipe detection
Next generation Ratio pyrometer for accurate temperature measurement
- Accurate temperature even at recycled/oxidized billet
- No EMC effect, hence minimized measurement errors
- Compact size and Easy to install: No need of cooling arrangement
- High temperature ( 315°C) sensing head with Fiber optics cable
Ratio pyrometer installed for accurate temperature measurement
Challenges
- Scales get formed on the surface of billet when hot metal comes in contact with air due to oxidation.
- Presence of scales leads to inaccurate temperature measurement.
- Previous pyrometer faced frequent problems due to the EMC effect.
- High rejection rate due to inaccurate billet temperature.
Billet coming out of furnace
Solution
- Ratio Pyrometer was installed for accurate temperature measurement even at 5% object visibility.
- It comes with focusable optics and high temperature ( 315°C) sensing head with Fiber optics cable.
- It comprises of green laser for alignment on red hot metal, because it is easily visible on the burning red-hot metal
Hot Billet entering on the conveyor
Key Specifications
- Temperature range: 1-channel : 450-3000°C; 2-channel: 525-3000°C
- Output: 2x 0/4-20 mA
- Power supply: 8 – 30 V DC
- Optical resolution: 100:1
- Spectral range: 0.8 – 1.1 µm
- Response time: 1 ms – 10 s
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
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