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High Availability Alarm System: 2oo3 Voting

Many process operations have processes that require tight pressure control.  Some processes are too critical to rely on just one pressure transmitter, since a transmitter failure could cause a nuisance or spurious trip or process upset. Furthermore, not all of these situations are in close proximity to a DCS.

High Availability Alarm System: 2oo3 Voting
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Instead of considering a sophisticated PLC and additional pressure transmitters, consider utilizing a 2oo3 voting scheme with SPA2 Site Programmable Alarm Trips by wiring their relays in a shutdown or alarm circuit scheme.  It is very easy to program vs a PLC and its SPDT relays are rated at 5A 250VAC/24DC.  The SPA2 is approved for installation in Class I Div 2/Zone 2 locations and is push button or PC programmable with quick and easy to use menus.  Each SPA2 has a local display and an optional 4-20mA retransmission.

Key attributes:

  • Simple 2oo3 voting configuration
  • Easy programming
  • Class I Div 2/Zone 2 approval and local display