The EPIC noncontact position transmitter represented a significant departure from previous attempts to reliably measure the position of rotary control valves. As opposed to conventional devices, couplers are not utilised. A magnetic proximity module, attached to the actuator output shaft is the only 'moving' part in the transmitter. Sensing is performed totally by noncontacting means, based upon characterisation of flux strength as a function of axial position.
A solid-state sensor is employed, whose output is a function of both flux density and excitation voltage. That property allows the use of an internal bridge circuit for accurate zero adjustment, where one arm of the bridge is comprised of the sensor, and the other comprised of a resistive divider for zero reference.
Transmitter output is 4-20 mA, two-wire, with compliance voltage ranging from 14,5 to 35 V. Output updating takes place 20 times per second, allowing use of the transmitter for applications not possible with transmitters of other types. The inherent reliability of the transmitter permits use of advanced control strategies, where knowledge of valve position can be used in predictive and other algorithms.
Fire safety in South Africa Technoswitch Fire Detection & Suppression Technews Publishing SMART Security Solutions
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Fire safety is sometimes ignored, sometimes relegated to whatever is cheapest, and sometimes treated with the seriousness it deserves, given that it focuses on protecting life and assets. SMART Security Solutions asked Brett Birch, MD of Technoswitch, for some insights into the realities of fire safety in South Africa.
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The JBC dynamic inclination sensor from ifm offers accurate angle measurement in the most demanding conditions, filtering out motion disturbances such as vibrations, shocks and vehicle dynamics to deliver reliable inclination values via IO-Link or programmable switch outputs.
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