Alicat P Series Pressure Gauge - Manual (Page 7)

7
MOUNTING
All P-Series Gauges and PC-Series Controllers have mounting holes for
convenient mounting to flat panels. These gauges are position insensitive and
can be mounted in any orientation. The sizes and dimensions for the mounting
holes are shown on pages 51 to 67.
P-Series Pressure Gauges may be connected into your system with the flow
going in either direction for ease of viewing the display. These units are shipped
with a plug for dead end applications. This plug should be removed for flow
through applications.
PC-Series Vacuum and Pressure Controllers are normally intended to control
the process pressure downstream of the controller. In order for this to occur the
controller should be mounted so the flow goes from left to right as you look at
the front of the unit. This puts the measuring portion of the device between the
valve and the leakage point where you are attempting to control the pressure
application. Back-pressure controllers reverse this configuration (see page 29).
PLUMBING
Your instrument is shipped with plastic plugs fitted in the port openings.
To lessen the chance of contaminating the flow stream do not remove
these plugs until you are ready to install the device.
Make sure that flow is in the direction indicated by the flow arrow.
Standard P-Series Gauges and PC-Series Controllers have female inlet and outlet
port connections. Welded VCR and other specialty fittings may have male ports.
The inlet and outlet port sizes (process connections) for different flow ranges
are shown on pages 51-67.
Instruments with M5 (10-32) ports have O-ring face seals and require no
sealant or tape. Do not use tape with welded or O-ring fittings.
For non M5 (10-32) ports use thread sealing Teflon® tape to prevent leakage
around the port threads.
Do not wrap the first two threads. This will minimize the possibility of getting
tape into the flow stream and flow body.
Do not use pipe dopes or sealants on the process connections as these
compounds can cause permanent damage to the controller should they get
into the flow stream.
When changing fittings, carefully clean any tape or debris from the port threads.
For additional notes on PCD (dual valve controller) plumbing see page 33.
For gas applications, it is recommended that a 40 micron filter be installed
upstream of P and PCR-Series instruments and a 20 micron filter be installed
upstream of PC and PCD-Series instruments.
For liquid applications, see “Using Alicat Pressure Instruments with Fluids”, page 8.
Connecting Fittings and Filters
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