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New digital controllers and indicators offer precise measurement

Posted: 27 Sep 2005 ?? ?Print Version ?Bookmark and Share

Keywords:macro sensors? american sensor technologies? ast? dmi-a1? dmi-d1?

Linear Variable Differential Transformer

Macro Sensors, an American Sensor Technologies (AST) company specializing in the manufacture of lvdt-based linear and rotary sensors, gauging probes, support electronics and related instrumentation, introduced a new family of economically-priced and user-friendly digital controllers and indicators that promises to deliver precise measurement for applications using AC- and DC-LVDT (Linear Variable Differential Transformer) inputs.

Designed to optimize the use of LVDTs in automation, process or lab applications, the Series DMI Single Channel LVDT Indicators offer user-friendly set-up with a scrolling display that actively prompts users for all LVDT parameters. A 5-digit alphanumeric display, which can be calibrated in any engineering units, offers readout down to 1/10,000-inch. These devices offer four programmable setpoints with alarm status annunciator LEDs. With the Series DMI Indicators, R&D staff, factory automation personnel and other technicians can easily set up and monitor the functionality of plant controllers and indicators without engineering assistance, added the company.

Designed to drive and condition the signal from an LVDT transducer, the Series DMI Single Channel LVDT Indicators contain two high-speed MCUs and a 16bit ADC converter that has over 130dB noise rejection at the excitation frequencies and is capable of 40Hz averaged output on 45 samples. Scrolling text menus provide quick access to a range of configuration modes for easy application setup.

LVDT sensors used with the Series DMI Single Channel LVDT Indicators can be applied in almost all engineering applications covering civil, mechanical, petrochemical, power generation, production, aerospace and defense. They can be used on production lines to automatically gauge products for quality control and product sorting.

Macro Sensors offers its digital LVDT controllers in both AC- and DC-versions. The DMI-A1 Series AC LVDT Indicator utilizes one of its two MCUs to generate the sine wave for the AC LVDT excitation frequency. These frequencies are produced as multiples of the line frequency (either 50Hz or 60Hz that are selectable via the scrolling text menus). Units provide a high-speed 10V scalable analog output without recalibration and built-in excitation to properly power any standard AC-LVDT.

Meanwhile, the DMI-DI Series DC LVDT Indicator communicates with the selected controller internally via the 1?C data bus. These devices offer a 10V scalable analog output without recalibration and built-in 24Vdc to power virtually any DC-LVDT.

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