Non contact infra red pyrometer, with cable and sensor head is used for temperature monitoring during the process of tablet coating. It solves the serious problem of overheating, blistering and cratering. The rugged optics allows it to operate it at very high ambient temperature without cooling, with accurate temperature control. Reliable coats and minimum injections are produced as the output. |
Temperature Monitoring during Tablet Coating process
Pilger mill in tube rolling mills - hot and cold pipe detection
- Continuous temperature measurement during the table and capsules coating process resulted in reliable coats and minimum rejections.
- Sensor output was used as a feedback signal to the air supply for air and temperature control
- Improved operational efficiency with reduced risks of defects during the tablet coating process
- Highly accurate and precise temperature control during the coating process
- Increases process efficiency and consequent production quality, yield and speed
Challenges
Overheating during the tablet coating process can cause various challenges such as blistering, cratering, pitting, blushing, sticking and picking.
High temperature can cause gases to be trapped under the film during the spraying process or at the end of the coating run. Other defects such as cratering may appear exposing the surface of the tablet.
High coating temperatures can also cause white specks or haziness to appear on the film.
Sometimes pits may occur in the tablet core without a noticeable defect on the on the coating.
Tablets may stick to each other and to pan walls.
Solution
Compact series, contactless IR pyrometer with electronics inside the cable and M12 construct sensor head is ideally suited for this application.
The sensor has an object temperature detection range of -50⁰C to 1030⁰ C and offers a fast response of 150ms.
With a rugged coated silicon optics it can operate at high ambient temperature of 180⁰C without cooling.
It also offers a LED alarm indication, analog (0-5/10V , 4020 mA) with simultaneous alarm outputs
Easy programming via smartphone or windows software
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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