Specifications

748414-A
August 1999
24
Heated Flame Ionization Detector Analyzer Module
Rosemount Analytical NGA 2000
3
STARTUP AND OPERATION
3.6 SAFETY SYSTEM
The HFID Analyzer Module safety system will not allow ignition or continuous burner
function unless the following conditions are present:
• The internal purge gas pressure is at least 380 hPa - gauge (5.5 psig). (Monitor display
message, Purge Gas Pressure in Physical Measurements menu, for proper setting.)
• Flow rate for purge air in is at least 16 L/min. and case pressure is greater than 0.5
inches of water. (Monitor display message, Purge Gas (ON) in Miscellaneous 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. (Monitor 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 torquing sequence (shown in Figure 3-3) must be followed
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.