Masoneilan SVI II AP Digital Positioner Quick Start Guide
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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.
WARNING
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 tubing to the air supply port
S
(arrow only for High Flow).
2. For a:
Single acting actuator: Pipe the outbound air from the output pressure port
I
(arrow only for High Flow) to the actuator.
Double acting actuator: Pipe output pressure port one
I
for one side of
the actuator and output pressure port two
II
for the other side of the
actuator.
3. Air supply:
Supply pressure for single acting SVI II and AP High Flow:
20 -100 psi (1.4 - 6.9 bar) (138 - 690 kPa)
Supply pressure for double acting SVI II AP:
25 - 150 psi (1.73 - 10.4 bar) (172.4 - 1034 kPa)
Minimum tubing diameter 1
⁄
4" (6 mm x 4 mm)
NOTE
The SVI II AP Digital Valve 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 clean, dry, oil-free sweet
natural gas supply ((H
2
S content not to exceed 20 ppm) (SVI II AP
models SVI II AP/SD through SVI II AP/AD).
Table 5:
Dew Point
At least 18° F (-7° 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
