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Question: How can a transducer be defined?

Answer: A transducer is a device with the capacity to convert one kind of energy to another. This conversion can be to/from electrical, electro-mechanical, electromagnetic, photonic, photovoltaic, or any other form of energy.

Example: Via electromagnetic conversion, a guitar amplifier takes the vibrations of the guitar’s strings and converts this to a sound frequency that is heard through the speaker.

Question: How does a pressure transducer function?

Answer: By integrating the foil strain gauge, a filled capillary and diaphragms to acquire a controlled pressure change which is electronically converted to signal output, that is then scaled to a distinct pressure range.

Available signal outputs for Dynisco sensors:

Available ranges for the various signal outputs: 

In Plastic Extrusion, pressure fluctuations at the die entrance could be the result of either an actual rate fluctuation coming from the extruder or a variation in temperature impacting viscosity. 

When melt temperature is stable, pressure variations are often a result of: 

Dyniscopressure transducers and Instruments enable detection of these conditions

Dynisco’s pioneering cap diaphragm is a machined 45-degree sealing surface that meets industry standard ½-20 threads composed of one-piece stem construction in most models. 

The threads are the industry standard of 1/2-20 UNF as improper dimensions will result in thread galling and material leakage. It is crucial to ensure appropriate hole dimensions using the Gauge Plug included in the Dynisco Cleaning Tool Kit: part number 200100. 

This is the way a transducer tip should look when it’s new.

Appropriate position of the transducer avoids unnecessary pressure build-up while ensuring adequate melt feed to pump. As well as ensuring adequate pump pressure to die and adequate pressure for the product, it ensures safety. 

Too close to the feed zone can result in damage from unplasticized pellets. Mounting too shallow in the hole leads to excessive deterioration of the material and freeze-off. 

Mounting too deep can cause damage to the tip resulting in measurement errors.

Repeated hole cleaning can result in holes being ‘too deep,’ as well as possible tip damage. Therefore, make use of spacers. 

Standard transducers are not water-tight. Dynisco circuitry can withstand extrusion plant environments but will not function when wet. Therefore, it is crucial to specify water-tight transducers when wet operation is unavoidable. 

Mounting holes are important as they cannot be eccentric, too small, or too large. 

When mounting transducers, always use a high temperature anti-seize compound. It is important to also use proper mounting torque: 

For the machining of a new hole, use Dynisco’s Machining Tool Kit, #200925. The following considerations when mounting torque upon installation should also be made:

Always remove the transducer prior to cleaning the barrel with abrasives, cleaning compounds, or a wire brush. Remove the transducer while the barrel is still hot and wipe the transducer tip clean. Remember to return and clean the hole with the cleaning drill/guide sleeve 

Dynisco cleaning tool kit (p/n 200100) makes the job easy, but remember to remove the transducers when cleaning the barrel, remove them when they’re still hot and extract any plastic build-up in the hole. 

Transducers operate best at midrange: 

It’s simple: Dynisco transducers have a built-in 80% R-Cal, and indicators that utilize R-Cal to calibrate the span. 

All Dynisco Melt Pressure Transducers incorporate a built-in 80% of full scale ‘R’-CAL. This is achieved using an internal resistor to electrically unbalance the bridge rather than strain-induced via applied pressure. ‘R’-Cal supplies a rapid and accurate method of transducer-to-instrumentation calibration.

Dynisco has published a number of documents to assist customers with application support. Please contact a Dynisco Rep for further details. 

This information has been sourced, reviewed and adapted from materials provided by Dynisco.

For more information on this source, please visit Dynisco.

Please use one of the following formats to cite this article in your essay, paper or report:

Dynisco. (2021, April 26). Pressure Sensor Care and Maintenance. AZoSensors. Retrieved on June 02, 2022 from https://www.azosensors.com/article.aspx?ArticleID=2210.

Dynisco. "Pressure Sensor Care and Maintenance". AZoSensors. 02 June 2022. <https://www.azosensors.com/article.aspx?ArticleID=2210>.

Dynisco. "Pressure Sensor Care and Maintenance". AZoSensors. https://www.azosensors.com/article.aspx?ArticleID=2210. (accessed June 02, 2022).

Dynisco. 2021. Pressure Sensor Care and Maintenance. AZoSensors, viewed 02 June 2022, https://www.azosensors.com/article.aspx?ArticleID=2210.

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