7
PLUMBING
Your controller 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 the gas will flow in the direction indicated by the flow arrow.
Standard MC-Series Gas Flow 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 61 - 82.
Controllers 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.
We recommend the use of in-line sintered filters to prevent large particulates
from entering the measurement head of the instrument. Suggested maximum
particulate sizes are as follows:
5 microns for units with FS flow ranges of 0-1 sccm or less.
20 microns for units with FS flow ranges between 0-2 sccm and 0-1 slpm.
50 microns for units with FS flow ranges of 0-1 slpm or more.
Connecting Fittings and Filters
http://www.alicat.com/support/instructional-videos/
PRESSURE
Maximum operating line pressure is 145 psig (1 MPa).
If the line pressure is higher than 145 psig (1 MPa), use a pressure regulator upstream
from the flow controller to reduce the pressure to 145 psig (1 MPa) or less.
Alicat
MCP
mass flow controllers are fitted with a high performance
valve for low pressure applications.
MCP mass flow controllers have a
maximum operating line pressure of 80 psig. See page 73.
CAUTION!
Exceeding the maximum specified line pressure
may cause permanent damage to the solid-state differential
pressure transducer.
