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Works with a 4-20 mA control signal as a set-point for 0% or 100% in conjunction with
a discrete 0-24 VDC signal as the safety trip trigger.
Communicates HART
®
over existing wires (4-20 mA or 24 VDC)
In addition, SVI II ESD is a PST controller that mounts on a pneumatically actuated valve
assembly. Its role is to position an emergency shutdown valve to 0% or 100% with a
probability of failure on demand (PFD) in accordance with IEC61508 for SIL3 application (SIL =
Safety Integrity Level). It replaces solenoid valves, typically utilized to actuate a spring-return
actuator, while providing extensive online valve diagnostics.
SVI II ESD Applications and Designated Safety Function Activation
There are three (3) SVI II ESD configurations used to connect to the control system in four (4)
different scenarios. The three configurations are used exclusively and cannot be combined in
any way. The SIL 3 circuit has complete and independent control to set the IP output to a
de-energized state upon demand. The SIL 2 rated annunciation function is the SW #1. HART
®
and AO are user-configurable to be SIL 2 rated annunciation functions as well. The customer
is expected to use appropriate SIL rated device to receive at least one of these signals.
There are three SVI II ESD models available:
ASD Model - Analog Safety Demand; 2 Wire Analog Trigger, 4 - 20 mA signal, 2 wire
installations with HART
®
communications.
DSD Model - Discrete Safety Demand; 2 Wire Discrete Trigger, 24 VDC, 2 wire
installations with HART
®
communications.
A/DSD Model - Analog Setpoint with Discrete Safety Demand; 4 Wire Discrete Trigger, 4
- 20 mA signal, 2 wire installations with HART
®
communications for control system and
24 VDC 2 wire for Safety System.
Содержание SVI II ESD
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