Rosemount 755, Instruction Manual

Page: 39 / 94

I
NSTALLATION
748183-H
2-17
Rosemount Analytical
November 1997
Installation options are shown in Figure 2-9. Use only clear dry air or suitable inert gas
for the purge supply. Recommended supply pressure is 20 psig (138 kPa, which
provides a flow of approximately 8 cubic feet per hour (approximately 4 liters per
minute), and a case pressure of approximately 0.2 inch of water (approximately 50
Pa). With a flow rate of four liters per minute, four case volumes of purge gas pass
through the case in ten minutes.
All conduit connections through the case must be sealed thoroughly with a sealant
(supplied in kit). The sealant, to be applied from the interior of the case, must
thoroughly cover all exiting leads as well as the conduit fitting.
F
IGURE
2-9. I
NSTALLATION OF
P
URGE
K
IT
645835 Purge
Outlet Fitting
190697 Purge
Inlet Fitting
Flow
Indicator
Purge Supply
Analyzer
Door
Affix Warning
Label
190697 Purge
Inlet Fitting
645835 Purge
Outlet Fitting
Pressure
Indicator or
Alarm
Purge
Supply
Analyzer
Door
Affix Warning
Label
A. Option with Flow Indicator B. Option with Pressure Indicator or Alarm
Components in dashed line are supplied by customer.