Using Sensors in Injection Molding and Extrusion Industries

An instrument is defined as a device (an indicator or controller) that receives a signal input representing a value, such as a temperature or a pressure, and is conveyed in the form of numbers or graphs.

Pressure Sensors and Instrumentation from Dynisco

For over six decades, Dynisco has produced pressure sensors and instrumentation for use in extrusion and injection molding industries, to offer safety, process refinement, and control.

When contemplating a pressure monitoring or control system, Dynisco firmly advises making use of local, discrete indicators and controllers to work alongside its precision sensors. The below sections will outline the value added by these instruments.

Possible pressure build-up is often a worry for owners and users of equipment within the extrusion and injection molding processes. The over pressure condition results in equipment failures, which lead to disruption of production, and increase the risk for user injury.

The primary use for Dynisco sensors and instrumentation is as a safety lockout system, which stops overpressure conditions in extrusion and injection molding processes by disrupting the equipment’s power source. The pressure sensor and instrumentation operate in alignment, and should be treated as a matched pair during calibration and maintenance.

The sensor pressure ranges for each application are chosen with consideration for the material and end product being manufactured. Dynisco instruments are specified based on the needs of individual applications, and are an immediate replacement for its legacy devices.

Indication and Control Devices

Dynisco provides indication and control devices that receive universal signal feedback from pressure and temperature sensors, to allow operatives to observe process variables locally, set alarm thresholds for prompt warning and shut down, and retransmission of the signal to higher control systems.

Dynisco’s ¼ din instruments (UPR900 and ATC990) boast more advanced features that will augment the operatives’ interface, such as:

  • Graphical/text LCD Display with color change LED backlight on alarm (red/green)
  • Graphical trend view of process, alarms & events as standard
  • Simple to operate Setup Wizard
  • Display of differential pressure is accessible
  • USB port option for access to configuration and log files
  • Data logging option records process values, set points and alarms to .csv file for use with spreadsheets
  • Modbus RS-485 and Modbus TCP Ethernet supported
  • Blue Control configuration and commissioning software option
  • Display pressure, temperature, or even differential pressure
  • Optional additional input/output for economical single instrument
  • Analog retransmission of process variable enables signal to be transmitted to other devices
  • Configure locally or remotely through optional Modbus RTU

The instrument’s simplicity is enhanced through graphical text and an LCD Display, while a screen color change on alarm ensures prompt awareness of an alarm condition for operators.

Set Up Wizard

Trend view offers the operator a line graphic to monitor, alongside the numerical display of process variables. The set up wizard is intuitively designed, and leads users through the parameter assignments when powering up the unit for the first time.

A USB and Data logging interface allows users to save parameter settings to fill additional indicators or controllers rapidly while storing process data either locally or on a removable flash drive in .csv file for statistical analysis. Modbus communication protocol can be accessed via RS485 or TCP Ethernet.

Blue Control Software

Blue control software is employed to generate, download, and store instrument configurations, run simulations, and retrieve .csv files from the data logger, if fitted. Analog retransmission carries the input signals to higher control systems in amplified signal outs such as 0-5V, 0-10V, or 4-20mA.

The line graph below exemplifies the data that the data logging feature of the UPR900 or ATC990 can capture.

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

For more information on this source, please visit Dynisco.

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