Controllers and indicators go beyond LVDTs

Edited by the Engineeringtalk editorial team May 2, 2006

Digital controllers and indicators can be used in virtually any industrial measurement and control application within the petrochemical, power generation, laboratory and manufacturing industries.

Macro Sensors has designed a family of user-friendly digital controllers and indicators that can be used in virtually any industrial measurement and control application within the petrochemical, power generation, laboratory and manufacturing industries.

Offering precise measurement for applications using AC- and DC-operated LVDT (linear variable differential transformer) inputs, Macro Sensors Series DMC dual channel LVDT controllers and Series DMI single channel LVDT indicators offer user-friendly setup with a scrolling display that actively prompts users through the process.

The DMC dual channel controllers also offers a GUI interface, enabling operators to quickly program and view data through a computer.

"The scrolling display of our digital controllers and indicators prompts users on what type of information to input during specific setup stages", notes Ed Herceg, Macro Sensors NA Sales Manager.

"R and D staff, factory automation personnel and other technicians can easily program these controllers and indicators without engineering assistance".

Macro Sensors offers its digital controllers and indicators in both AC- and DC-versions.

The DMC-D2-100 dual channel DC-LVDT controller scrolling meter operates from 115V AC or 24V DC and provides proper voltage for operating any standard DC-LVDT.

Its DC LVDT input module is designed to drive the signals for two DC-LVDT transducers.

The DMC-A2-100 dual channel AC-LVDT controller scrolling meter is powered from 24V DC or 120-240V AC to provide optional analogue outputs of DC voltage or current loop.

The DMI-D1-100 single channel DC-LVDT indicator communicates with the selected controller internally via an I2C databus.

Units offer a 10V scalable analogue output without recalibration and built-in 24V DC to power virtually any DC-LVDT.

The DMI-AI-100 single channel AC-LVDT indicator uses one of its two microcontrollers to generate the sinewave for the AC LVDT excitation frequency.

Units provide a high-speed 10V scalable analogue output without recalibration and built-in excitation to properly power any standard AC-LVDT.

Both the DMC controllers and DMI indicators incorporate internal signal conditioning that provide the proper voltage for operating LVDTs and a scalable analogue output to feed external instrumentation, recording or control devices.

Offering readout down to 0.0001in, all units provide a bright 0.56in high LED vivid front-panel digital display of measured values.

DMC dual channel LVDT controllers offer six independently programmable set points with eight selectable functions; DMI single channel LVDT indicators offer four programmable setpoints with alarm status annunciator LEDs.

DMC digital controllers feature microprocessor-based logic and advanced software to provide digital position indication and cross-channel maths functions for advanced monitoring, measuring and control.

Programmable input averaging and digital filtering allow for quick response.

High/low limit detection is useful in a variety of "go/no-go" gauging applications.

A standard RS232 communications port can be used with data loggers, PLCs and computers.

Units offer up to 16 excitation frequencies, selectable using the scrolling text menu in the controller setup.

"Our digital indicators and controllers can be used on production lines to automatically gauge products for quality control and product sorting as well as in the power generation and petrochemical industries for servo position feedback on actuated equipment such as valves and dampers", notes Herceg.

The DMC dual channel LVDT controllers and DMI single channel indicators are economically priced at about one-third lower than competing LVDT dedicated units.

Units can be fitted on a panel or used as tabletop instruments.

An optional network capability supports multi-channel applications by permitting the interface of multiple units within an automation system.