8 Getting Started
Mounting
All liquid controllers have mounting holes for convenient attachment to
flat panels. No straight runs of pipe are required upstream or downstream.
Controllers are position insensitive and can be mounted in any orientation.
If air bubbles are continuously introduced to the flow upstream
of the device, the device may be mounted upside down to
prevent bubbles from being trapped in the pressure sensor
ports. Tare the device after changing its position or orientation.
! If the device has been installed upside down, avoid using the
bleed screws as liquid may leak into the electronics housing
causing permanent damage that is not covered under warranty!
▲Caution: Flow controllers that use large Rolamite valves should
be mounted with their valve oriented vertically (right-side up).
If another orientation is desired, please contact support.
Process Ports
Your flow controller 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 liquid flow controllers have female inlet and outlet ports. Welded
VCR® and other specialty fittings may have male connections.
• If you are using a fitting without a face seal, use thread-sealing 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 tape to the threads.
• When changing fittings, carefully clean the port threads.
! Warning: 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.
Filters
When pressure drop is not an issue, use in-line sintered filters to prevent
large particulates from entering the flow controller. Suggested maximum
particulate sizes are as follows:
≤100 ccm flow range: 20 microns >100 ccm flow range: 40 microns
Avoiding long runs of small-diameter tubing upstream or
downstream of the device will reduce liquid hammer.
