Pneumatic Module; Pneumatic Module With Single Acting Relay - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Position Transmitter (AO)
The SVI II ESD has the ability to retransmit the position signal as an output to another device
with 4 - 20 mA current output proportional to position. Enter a lower range value and an upper
range value.

Pneumatic Module

The pneumatic module consists of an I/P and relay assembly.
Current-to-Pressure Converter, I/P
The I/P converts a current signal into a pressure signal in the following manner. A fixed coil
creates a magnetic field proportional to the applied current. The field magnetically pulls a
flexure towards a nozzle to increase pressure on the flexure. The pressure on the flexure
increases in response to a coil current increase. Coil encapsulation of the provides protection
from environmental pollution.
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. 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 100 psi (6.9 bar, 690 kPa).
130 |
=GE Oil & Gas
Figure 76 Pneumatic Module with Single Acting Relay
I/P Current to Pneumatic Converter
Relay
(Pneumatic Amplifier)
Vent
© 2016 General Electric Company. All rights reserved.