White Paper: Introduction to Fiber Optic Sensing

Introduction to Fiber Optic Sensing

Fiber optic sensing is becoming increasingly common in various industries, including manufacturing, medical, aerospace, automotive, civil, and energy. There are dozens of different types of technology on the market, each with its own set of capabilities. Because of the variety of technologies, navigating the fiber optic sensing landscape can be difficult.

This white paper, courtesy of Sensuron, intends to provide a framework for understanding multiple fiber optic sensing technologies and insights into market trends.


For decades, point sensing solutions such as strain gauges and thermocouples were  "good enough," but this mindset frequently stifles innovation. Today, many Sensuron clients have innovated beyond their ability to test with legacy technologies. New, robust sensing technologies, such as Sensuron fiber optic solutions that can monitor beyond the scope of point sensors, are required to enable the next generation of innovations.

For more information in New England and Upstate New York, contact AP Corp by calling (508) 351-6200 or visiting https://a-pcorp.com.

In-Line Color Measurement in the Molten Polymer

In-Line Color Measurement in the Molten Polymer

Color measurement is a widely used technology for ensuring the quality of color values during the manufacturing process. Typically, these measurements happen offline. The time it takes between sampling and receiving results from the laboratory can be lengthy. A significant disadvantage is that only one measurement occurs during this period, and the color quality during, before, and after the sampling point is unknown. A complete analysis is possible because inline color measurements are performed directly in the melt, but when color variations occur, immediate intervention is possible.

Inline color measurement will provide product-quality indicators for immediate and automatic adjustment of process parameters. The outcome is to maintain the highest possible product quality without waiting for sample analysis from the plant's laboratory.

Equitech International Corp. has been in business since 1995, supplying fiber-optic spectroscopic instruments for process analysis to pharmaceutical, chemical, and food manufacturers. In 2005 they entered the plastics market and began extending their technology into inline color monitoring and real-time closed-loop process control. They published a helpful Technical Paper titled In-Line Color Measurement in the Molten Polymer. You can download that paper here.

Dynisco Pressure Sensor Maintenance and Cleaning Procedures

Certain maintenance and cleaning measures should be performed to ensure the long-term durability and accuracy of your Dynisco pressure sensor. This video demonstrates how to remove, care for, and maintain a Dynisco pressure sensor from an extruder.

This video explains the proper removal, care, and maintenance process of an extruder's Dynisco pressure sensor.

Do not attempt removal of the sensor while there is pressure in the process still, as this could cause polymer ejection through the sensor mounting hole.

The technician will unscrew the sensor from the extruder. Ensure that you are wearing proper safety equipment while removing the sensor. Dynisco recommends the sensors are removed from the process while hot. The technician then wipes clean the sensor immediately with a cotton rag. Dynisco does not recommend the use of sharp tools, screwdrivers, or wire brushes for removing polymers. With the diaphragm free of material, the technician examines the tip for damage or deformations. Damage may appear as a depression or a bubble on the diaphragm. Any deformation may affect the pressure reading. Dynisco recommends the sensor be sent back for evaluation by our repair department upon discovery of damage.

With the sensor removed, the focus is now on material that has entered the threaded area and the 45-degree seat—using the Dynisco mounting hole cleaning tool kit. The kit consists of a four fluted cleaning drill for cleaning the ½ 20 UNF threads and then a unique tool for cleaning the  45-degree seat (guide sleeve and T handle).

The technician will manually spin both tools into the mounting hole threads to remove polymer residue and other materials. After the hole is clean, the technician uses the gage plug included in the kit to check the mounting hole for contact points via the Dykem machine blue. The Dykem should not be missing around the edge of the tip; only the 45-degree seat will make contact. If contact appears on the outer diameter of the tip, then there is potentially pressure building on the sensing end of the sensor, which can cause damage, such as depressions or bubbles.

Once the mounting hole and contact points are confirmed clean, reinstall the sensor into the process, paying attention to the correct mounting torque. For the ½ 20 UNF threaded pressure sensor,  the recommended torque is 100 inch-pounds. Hand-tight and a quarter turn is the best practice. Over torque can cause the threads to gall. If your sensor is over-torqued,  use anti-seize to aid in the future removal of the sensor. Heat the pressure sensor to the proper temperature before re-pressurizing the extruder.

Proper care and maintenance of your sensors and mounts are essential for reducing operating costs and prolonging the lifespan of your sensors.

For more information on Dynisco products in New England and Upstate New York, contact AP Corp. Call (508) 351-6200 or visit https://a-pcorp.com.

Special Offer - Up To 35% Off a Druck DPI620PC or DPI620SPC Package

35% Off a Druck DPI620PC or DPI620SPC Package

The Druck DPI 620 is a sophisticated multi-function calibrator and HART/Foundation Fieldbus communicator combined to provide a world-class pressure measurement and generation. For usage in hazardous places, ATEX and IECEx approved intrinsically safe versions are available. 

Druck is offering a special promotion. Get 35% off when you purchase a DPI620PC or DPI620SPC package.

A DPI620PC package is defined as one of the following:

  • Safe Area - PN DPI620PC-2barg, DPI620PC-7barg, DPI620PC-20barg
  • Hazardous Area - PN DPI620SPC-2barg, DPI620SPC-7barg, DPI620SPC-20barg
  • HART capability, Safe Area - PN DPI620PC- H-2barg, DPI620PC-H-7barg, DPI620PC-H-20barg
  • HART Hazardous Area - PN DPI620SPC-H-2barg, DPI620SPC-H-7barg, DPI620SPC-H-20barg

All include Druck’s latest 4Sight2 software for up to 35% off the combined list price of the individual products.

For more information in New England, contact AP Corp. Call (508) 351-6200 or visit https://a-pcorp.com.

Part Cleaning Demonstration with the Dynisco PolyClean

This video demonstrated how to clean parts, in this case pressure sensors, using the PolyClean fluidized temperature bath.

Dynisco’s PolyClean is a fluidized temperature bath that will clean parts and tooling  2 to 3 times faster and safer than traditional cleaning methods, such as ovens. Dynisco’s fluidized bath system is air¬controlled with advanced PID temperature controller for optimal thermal performance. The system uses aluminum oxide sand (heated up to 1112°F) and air to surround the part or tooling. The “sand” will gently breakdown the polymer without damaging the part or tooling.

For more information about Dynisco in New England and Upstate New York contact AP Corp. Call (508) 351-6200 or visit https://a-pcorp.com.

A Live Webinar - Advanced Induction Heating: Brazing - Register Now!

Advanced Induction Heating: Brazing

Ambrell Induction Heating Solutions, a world leader in induction heating technology,  has an important upcoming PRO Skills webinar:

Advanced Induction Heating: Brazing

June 16th at 11:00 AM Eastern Time


Dr. Girish Dahake, Sr. Vice President of Global Applications

Dr. Dahakeone is one of the world’s foremost induction scientists. His webinars draw hundreds of attendees per event and they come from countries across the globe.

Each webinar is designed to provide helpful, relevant content about induction heating.  The webinars are approximately 1 hour in length and are followed by an interactive Q&A session with Dr. Dahake, which typically lasts about 30 minutes.