Alicat MC Series Mass Flow Controller - Manual (Page 7)

7
PLUMBING
Your controller is shipped with plasti c plugs fi tt ed in the port openings.
To lessen the chance of contaminati ng the fl ow stream do not remove
these plugs unti l you are ready to install the device.
Make sure that the gas will fl ow in the directi on indicated by the fl ow arrow.
Standard MC-Series Gas Flow Controllers have female inlet and outlet port
connecti ons. Welded VCR and other specialty fi tti ngs may have male ports.
The inlet and outlet port sizes (process connecti ons) for diff erent fl ow ranges
are shown on pages 50 - 70.
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 fi tti ngs.
For non M5 (10-32) ports use thread sealing Tefl on® tape to prevent leakage
around the port threads.
Do not wrap the fi rst two threads. This will minimize the possibility of getti ng
tape into the fl ow stream and fl ow body.
Do not use pipe dopes or sealants on the process connecti ons as these
compounds can cause permanent damage to the controller should they get
into the fl ow stream.
When changing fi tti ngs, carefully clean any tape or debris from the port threads.
We recommend the use of in-line sintered fi lters to prevent large parti culates
from entering the measurement head of the instrument. Suggested maximum
parti culate sizes are as follows:
5 microns for units with FS fl ow ranges of 0-1 sccm or less.
20 microns for units with FS fl ow ranges between 0-2 sccm and 0-1 slpm.
50 microns for units with FS fl ow ranges of 0-1 slpm or more.
Connecti ng Fitti ngs and Filters
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PRESSURE
Maximum operati ng 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 fl ow controller to reduce the pressure to 145 psig (1 MPa) or less.
Alicat MCP mass fl ow controllers are fi tt ed with a high performance
valve for low pressure applicati ons. MCP mass fl ow controllers have a
maximum operati ng line pressure of 80 psig. See page 61.
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