Emerson Process Management 760004-A - Manual (Page 36)

Instruction Manual
760004-A
February 2002
3-6 Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA 2000 HFID
than 0.5 inches of water. (Monitor display
message, Purge Gas (ON) in Miscellane-
ous Control Parameters menu for correct
state. Proper sealing hardware must be
used in order to obtain the required purge
air in flow rate and case pressure).
• Five case volumes of purge air have been
achieved and the three above conditions
are present. The time duration to achieve
a safe system is a minimum of 6 min. The
elapsed time can be monitored in the
Technical Startup Analyzer menu. (Moni-
tor the Purge Air Green LED (ON), Purge
Control Status (ON), or Purge Air Alarm
for indication of the state of the safety
system.)
As stated above, proper sealing hardware is
crucial to the successful operation of the
safety system. Therefore, a specific torque
sequence (shown in Figure 3-3) must be fol-
lowed when the front panel of the module is
being reinstalled after removal. All front and
rear panel screws must be installed.
NOTE
Do not over-torque rear panel screws.