Installation and Set Up
Connecting the Tubing and Air Supply
7
Connecting
the Tubing
and Air
Supply
The last step in hardware installation for the SVI II AP is to connect the
air supply to the positioner. This section describes the process for
connecting the tubing and air supply to a single and double acting
positioner.
Isolate the valve from the process and disconnect air tubing from the
positioner. Disconnect air fully to avoid injury or process damage.
1.
Install the pneumatic tubing using a regulated, clean,
instrument air supply to the air supply port (
S
←
)
2.
For a single acting actuator - pipe the outbound air from
the output pressure port (
←
I
)
to the valve actuator.
3.
For a double acting actuator - pipe the air going out of
each side of valve actuator. Use both output pressure port
one (
←
I
) for one side of the actuator and output pressure
port two (
←
II
) for the other side of the actuator.
4.
Connect air supply and actuator outports (1
⁄
4 inch NPT)
Supply pressure for single acting SVI II AP:
20 -100 psi (1.4 - 6.9 bar) (138 - 690 kPa)
Supply pressure for double acting SVI II AP:
20 - 150 psi (1.4 - 10.4 bar) (138 - 1035 kPa)
Minimum tubing diameter 1
⁄
4 inch (6mmx4mm)
Note:
The SVI II AP Digital Positioner is designed to operate with
clean, dry, oil-free, instrument grade air to ANSI-ISA-57.3 1975
(R1981) or ISA-S7.3-1975 (R1981) or with a sweet natural gas
supply (SVI II AP models SVI II AP-2 through SVI II AP-3).
Table 3
Dew Point
At least 18° F (10° C) below minimum anticipated ambient
temperature
Particulate Matter
Filtered to 5 microns
Oil Content
Less than 1 ppm w/w
Contaminants
Free of all corrosive contaminants
Air Supply Requirements
Summary of Contents for Masoneilan SVI II AP-2
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Page 8: ...Masoneilan Dresser SVI II AP Quick Start Guide vi ...
