Masoneilan SVI3 Installation and Maintenance Manual
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© 2021 Baker Hughes Company. All rights reserved.
2.3.3.3 Single Acting Pneumatic Relay
The single acting pneumatic relay amplifies the pressure from the I/P and increases
airflow as required for stable, responsive, actuator performance. The single acting relay
operates on any supply pressure that is at least 5 psi (.345 bar, 34.5 kPa) above the
required actuator pressure, up to 120 psi (8.3 bar, 830 kPa).
Figure 3 SVI3 Pneumatic Module with Single Acting Relay
2.3.4 Optional Display Module with Pushbuttons
The optional display and buttons are mounted on the SVI3 cover plate. The four
pushbutton switches operating in conjunction with the display permit reading and
modification of the instrument operating parameters without a PC or HART
®
hand-held
communicator. These switches perform generic functions - Increase, Decrease, Accept
and Smart Cal/Back by movement through a conventional menu structure, See “Using
the Digital Interfaces” on page 51. The Switches are operable as indicated on the product
label, including when intrinsically safe and flameproof protection concepts are required.
2.3.5 Options Module
Options module is an electronics add-on which extends the positioner functionality. It
includes solid state relay based switches, Digital input, 4-20 mA position retransmit, 1-5V
process variable input and remote position input. This module has all the required wiring
terminations for I/Os and can be field installed if purchased separately.
Pneumatic
module
