Wireless devices are the ideal solution for monitoring important process variables that are uneconomical to measure by conventional methods. WirelessHART makes it possible to acquire measurements from dense plant areas, remote locations and even moving vessels. What is more, wireless instruments support advanced asset management solutions, allowing information to be exchanged with the measurement sensor to aid proactive maintenance strategies across the plant.
A WirelessHART mesh network protocol has built-in safeguards that ensure reliable and secure communication. The network is self-organising and self-healing with redundant paths, so operation is reliable even when obstacles or interference interrupt a communication path.
The Fieldgate collects the measured values at regular intervals and transmits the data, along with the device and battery status, to the plant network. The result is a cost-effective process measurement that includes signal status and device health information.
Access to the instrument status and diagnostics means greater confidence in the measurement and therefore optimised performance from the application.
As HART is a digital protocol, the field device can be set to operate in ‘Digital Mode’. This means the power consumption is reduced, operating at a fixed 4 mA compared to the normal 4-20 mA variable signal normally used to drive an analogue I/O system. Operating in ‘Digital Mode’ can give an energy saving of approximately 40-60% during typical use. Across a large plant, it offers a route to substantial energy saving.
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