Instruction manual

Instruction Manual
HAS64E-IM-HW
September 2008
NGA 2000 HFID
3 - 11OperationEmerson Process Management GmbH & Co.OHG
3-6 SAFETY SYSTEM
The HFID Analyzer Module safety system will not allow
ignition or continous burner function unless the follow-
ing conditions are present:
• The internal purge gas pressure is at least 380
hPa-gauge (5.5 psig).
Monitor message "Purge Gas Pressure" in "Physi-
cal Measurements" menu (Figure 3-11) 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 Paramteres" menu (Fig-
ure 3-2) 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 sys-
tem is a minimum of 6 min. (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 torque sequence (shown in
Figure 3-13) 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.
Figure 3-13: Front Panel Torque Sequence
6 1 4
2 3 5
Torque Sequence:
Screw #1, 4 to 5 turns
Screw #2, 4 to 5 turns
Screw #3, 4 to 5 turns
Screw #4, 4 to 5 turns
Screw #5, 4 to 5 turns
Screw #6, 4 to 5 turns
Repeat torque sequence until all screws are tight.
The gasket must fill in between the front panel plate