TANK
FEEDBACK TUBE
OUTLET TUBE
* Remote Pressure Sense Port Adaptors
Figure 2.
Remote Pressure Sensing
REMOTE PRESSURE SENSING
The T9000 series pressure controllers can sense
pressure from a remote location in the process
system by employing the remote pressure sensing
port. Remote pressure sensing can be usefull for
improving system response and eliminating the
pressure drop associated with air flowing through
the outlet tubing between the pressure controller
and the process.
Remote pressure sensing is accomplished by
removing the remote sensing port plug and inserting
the 21665-* remote pressure sensing adaptor in the
port. This special adaptor blocks the pressure
sensing passage coming from the outlet chamber of
the pressure controller and makes the on board
feedback pressure sensor connection available at
the adaptor.
CAUTION:
Because of propagation delays in long
feedback lines, the there is a limit in the length
of the feedback line that can be employed,
otherwise the system pressure will oscillate. In
general terms, the longer the feedback line, the
larger the line must be to affect a stable
system. Adjustment of the T9000's PID
constants may also be required. Be sure there
are no restrictions (kinks in the line or
undersize fittings) in the feedback line. Some
experimentation may be required to determine
the line size for the length of run of the
feedback line.
CAUTION:
To prevent damage to the Remote Pressure
Sense Port Adaptor, support the Remote
Pressure Sense Adapter with a wrench when
installing the air line fitting. For more
information,see Figure 3. below.
21665-*
ADAPTOR
Part Number
Pipe Connection
21665-1N
1/8-27 NPTF
21665-1U
1/8-28 BSPT
2