10
Getting Started
Mounting
No straight runs of pipe are required upstream or downstream of the meter.
For most flow meters, you can mount or hold the meter in any position,
because it is internally compensated for any changes to its orientation
during use. The flow meter is also minimally affected by vibrations, so it can
on top of a vibrating instrument with little impact to measurement accuracy.
Device Ports
Your flow meter has been shipped with plastic plugs fitted into its ports.
To lessen the chance of contaminating the flow stream, do not remove
these plugs until you are ready to install the device.
Standard gas flow meters have female inlet and outlet ports. Welded VCR®
and other specialty fittings may have male connections.
•
If you are using a fitting that does not have a face seal, use
thread-sealing Teflon tape to prevent leakage around the
port threads, but do not wrap the first two threads. This
will minimize the possibility of getting tape into the flow
stream and clogging the laminar flow elements (LFE).
•
If you are using a fitting that has a face seal, there is
no need to apply Teflon tape to the threads.
!
Warning:
Do not use pipe dopes or sealants on the process
connections, as these compounds can cause permanent
damage to the meter should they get into the flow stream.
Filters
When pressure drop is not an issue, use in-line sintered filters to prevent
large particulates from entering the flow meter. Suggested maximum
particulate sizes are as follows:
• 5 microns
for units with flow ranges of 1 sccm or less.
• 20 microns
for units with flow ranges between 2 sccm and 1 slpm.
• 50 microns
for units with flow ranges of 1 slpm or more.
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