Dual-channel controllers designed for variety of applications

Two new six-digit, dual-channel controllers from Macro Sensors are designed for applications involving LVDT-based displacement transducers or CR half-bridge gauging probes.

04/06/2005



Two new six-digit, dual channel controllers, DMC-A2 (shown) and DMC-D2, from Macro Sensors are designed for applications involving LVDT-based displacement transducers or CR half-bridge gauging probes.

Two new six-digit, dual-channel controllers from Macro Sensors are designed for applications involving LVDT-based displacement transducers or CR half-bridge gauging probes. (LVDT stands for linear variable differential transformer.) DMC-A2 dual channel ac-LVDT controller and DMC-D2 dual channel dc-LVDT controller perform arithmetic calculations between two channels for T.I.R. measurements or differential measurement for use in production lines to automatically gauge products for quality control and product sorting.

Controllers can be used in power generation and petrochemical industries to provide servo position feedback on actuated equipment, such as valves and dampers, or for measuring turbine case expansion. NEMA-4 front panel lets units be used in marine and offshore mining applications. Digital devices incorporate a scrolling display that actively prompts users to input information during specific set-up stages. Users can also view and program data to the controller through a computer using a GUI interface via RS-232 or TCP/IP communications.

Features of controllers include internal signal conditioning to provide proper voltage for operating LVDTs; four independently programmable setpoints with eight selectable functions; microprocessor-based logic for digital position indication, linearization, and cross-channel math functions; input averaging and digital filtering; and scalable analog output for use with data loggers, PLCs, and computers. Both models are single or dual 16-bit isolated programmable. Five, four-amp relays provide automatic output to external controls. Units can be fitted on a panel or used as tabletop instruments.

—Jeanine Katzel, senior editor, Control Engineering, jkatzel@reedbusiness.com





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