Brooks Instrument 5882/92 - Manual (Page 15)

15
Installation and Operation Manual
X-TMF-FM-MFC-eng
PN 541-C-007-AAG
April, 2008
Flomega, Liquid MFC’s/MFM’s
Note:
The control valve in the 5881/5882 provides precision control. If positive shut-off is required, it is
recommended a separate shut-off valve be installed in-line.
f. The controller body is machined to accept 5/16”-24, threaded inlet and outlet fittings. Make sure that
the proper o-ring size (902) and material is used when securing the fittings.
CAUTION:
When used with a reactive (sometimes toxic) liquid, contamination or corrosion
may occur as a result of plumbing leaks or improper purging. Plumbing should be
checked carefully for leaks and purged with nitrogen before use. (Refer to step a.)
2-13 Start-up Guidelines
a. After the flow controller has been installed in the flow system and the connecting cable attached (refer
to fig 2-1), apply power, set the command to 100%, and purge the controller with liquid to a minimum
of 15 minutes or give V.O.R. + for some minutes. This is most important if the process liquid contains
elements which will react with air components to form corrosive or precipitative mixtures. It will also
preserve the accuracy and life of the controller. This purge should also be performed when a controller
is being removed from an active, corrosive, or toxic process liquid line.
b. Set the command to zero and block the flow downstream of the controller. Wait at least 35 minutes to
allow the flow controller to reach operating temperature. Check the output signal from the controller
(pin 2) with a voltmeter. If necessary, adjust the “zero” potentiometer (accessible through cover) to set
the output signal to 0 mV +/-10 mV.
Note:
An absolute zero shift may occur during normal controller operation if the ambient temperature is
substantially different than the temperature when the adjustment was performed.
The “zero” output signal can be adjusted. Please don’t remove the cover. If possible the “zero” pot should
be adjusted while the controller is in its normal working environment.
Section 2 Installation