Limitorque QX quarter-turn, smart electronic valve actuator

The Limitorque QX quarter-turn, smart electronic valve actuator includes an absolute encoder for tracking position without the use of batteries. The QX design provides enhanced safety and reduced downtime through improved diagnostics, built-in self-test (BIST) features and LimiGard fault protection.

The use of an absolute encoder simplifies valve automation from configuration and set-up into normal operations, diagnostics and troubleshooting. The QX encoder employs system-on-chip technology using a contactless magnet that excites Hall effect devices to provide redundant, 12-bit resolution over 360°. This redundancy, part of the BIST feature, means the device can continue to function reliably until a number of faults have been accumulated.

A graphical dot-matrix display allows 180° rotation of text and diagnostic graphs, and supports 10 languages. Optional Bluetooth wireless connectivity is available and, when used with Limitorque Dashboard Windows-based software, diagnostic information is easily transferred to a PDA, laptop computer or mobile phone.

Network communications such as Modbus, FOUNDATION Fieldbus H1, DeviceNet, Profibus DP V1 and Profibus PA offer the user bit strobe I/O messaging and other benefits. A device type manager (DTM) is also available for Profibus.

The Limitorque QX actuator is available in five distinct torque sizes from 136 to 2040 Nm, and includes a handwheel parallel to the LCD screen to permit ease of manual set-up and operation, and the ability to be installed in areas with limited space.