Extrusion Control offers a wide array of extrusion pressure related products from rupture disks/blow plugs, pressure gauges, transducers, and transmitters to pressure indicators and controls. Call us today for all of your extruder pressure needs.
The P304i pressure indicator and the P304c pressure controller are slide-in replacements for the now obsolete Dynisco indicator models UPR700 and UPR800 and controller models ATC770 and ATC880. Simple retrofits require no rewiring and the operator and configuration parameters will be recognizable to those familiar with the Dynisco products. The P304 series are purpose designed for plastic extrusion machinery, so they are simple to use and provide a great value.
A melt pressure transducer is used to accurately measure head pressure at process temperature. They are specifically designed to minimize the proportional influence high temperatures have on pressure measurement. The measurement that sensor makes can be displayed locally, retransmitted to a control system, or directly tied to a PLC, and may be networked via communications protocol.
SIL2 is a designation assigned to certain products, based on a certified, predetermined rate of failure. The designation is important to OEM but may or may not have value for the end user, especially when sourcing replacements.
In polymer extrusion, differential pressure normally refers to the difference in pressure before and after the screen or screen pack. This information can be particularly useful in determining when to change screens to maximize their longevity and maintain consistent product. The values can be brought to a single indicator to display the differential pressure and alarm at a certain value to indicate that it is time to change screens.
A rupture disc can be employed so that it fails at a predetermined pressure point. This is a visual confirmation that the machine has reached over-pressure. Those can be outfitted with sensors for an output upon break. A melt pressure sensor can be employed and fed to a local alarm unit. Using the higher technology allows for multiple levels of alarm condition responses.
Performance Levels inform extruder owners about the level of safety one can assume is in place on a given machine. Melt pressure sensors can be equipped with different outputs that give them PL”c” and PL”d” ratings. Features from these approvals will include integral safety relays and Certified Analog Outputs.
Calibrate a melt pressure sensor by applying a known amount of pressure to the diaphragm and recording the sensor reading. The sensor will have a predetermined accuracy range. If the sensor reads outside that range, you may choose to create an offset in our display/control system. You may also choose to discard this sensor and replace it with one that operates within tolerance.
Many melt pressure sensors require a capillary filled with one of a few reactive materials, the most common is mercury. Extrusion Control & Supply stocks non-mercury fill sensors that are drop-in replacements. We can also responsibly dispose of your mercury-fill sensors; call us instead of throwing them away.
NaK is a chemical compound used as fill in the capillaries of melt pressure sensors. It is preferred over mercury and oil because it’s considered as safe and its high operating temperature (up to 538°C with an Inconel diaphragm!)
It is possible that an oil-fill transducer would fit your application. FDA approved oil is only advantageous when extruding in a process that requires FDA inspection. There are physical limitations related to temperature and abrasion that make these less desirable. Contact an ECS expert for guidance.
Yes! Extrusion Control & Supply offers no-fill sensors that measure with high accuracy and some are made to withstand the most abrasive and corrosive application in the business.
Ideally, your nominal pressure should fall within the middle 80% of the sensor’s full scale. ECS stocks 0-10,000 PSI, 0-5000 PSI, and 0-3000 PSI ranges.
Absent an image of the product nameplate or label, we can use what you know about the sensor to match it up with a replacement. Call ECS for a talk about what you need to replace!
Gentran is a brand that is no longer sold and based on a technology that has been improved upon. Trust Extrusion Control & Supply to cross-reference that Gentran melt pressure transducer. Don’t sacrifice quality in the pursuit of low prices!
Extrusion Control & Supply are experts at determining how your sensor failed and how steps can be taken to maximize the life of each one you employ. Call ECS for assistance!
Modern melt sensor designs allow for an integral, replaceable thermocouple that can give a good reference temperature at the same point the pressure is being sensed. Each output from the sensor can be delivered to a dedicated display and multiple alarms can be used to indicated status.
Rupture disks, or blow plugs, are identified by diameter, overall length, thread type, and the presence of some other options. We will positively identify what you want and direct you accordingly. Extrusion Control & Supply boasts the largest stock of rupture disks/blow plugs in the USA. We can fabricate custom requests and deliver quickly across the country and around the world.
When a disk fails, the cause can be difficult to diagnose because the ruptured disk relieves the condition that caused it and often erases evidence of the root cause. However, some common causes are: that the disk was not installed correctly, the burst pressure was specified at the wrong temperature, the pressure experienced exceeded the rated burst pressure, or the disk had a manufacturing defect.
Rupture disks, or blow plugs, should reliably protect your investment in equipment, and most importantly, plant personnel. You need to be sure they are made by a manufacturer experienced in pressure relief, using certified materials. ECS offers rupture disks from manufacturers who guarantee quality devices in accordance with global standards, supported by burst and leak test certificates.
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