Model NGA2000 HFID

Instruction Manual

748297-E June 2003

Noncompliance could cause damage to the module. At the very least, the mod- ule's safety system, which requires a certain volume of purge air flowing through the case before allowing burner ignition, will not allow the instrument to operate. The lowest purge air flow/pressure setting possible during burner operation is preferable. Thus, the user should set the external purge air pressure initially at 689 hPa-gauge (10 psig). Check the Miscellaneous Control Parameters screen under Technical Di- agnostics, and note whether the Purge Gas (switch) variable is "ON." If it is "OFF," increase purge air supply by

69 hPa-gauge (1 psig), and recheck the Purge Gas variable until it reads "ON."

DO NOT EXCEED 1378 hPa-GAUGE (20 PSIG). If the maximum setting is reached, and the Purge Gas variable does not read "ON," contact factory. If the safety system is initiated successfully (Purge Gas variable is "ON"), continue with the remainder of the startup procedure.

Note

Do not restrict the PURGE OUT port and the pressure relief valve. They must be vented to atmospheric pressure.

12.Manual or Auto-ignite the flame. The Flame-On green LED should be illumi- nated.

Two methods of burner ignition are pos- sible: auto-ignition and manual ignition. (Note: The burner is easier to ignite when the oven has reached the desired setpoint temperature.)

Auto-ignition provides fuel override and three attempted ignitions (default set- ting), if necessary.

Before ignition and operation, Fuel Flow must be set to ON in "Light Flame" dis- play screen under Basic Controls and oven temperature must be at least 85°C.

The manual ignition switch on the Analyzer Module front panel must be manipulated in the following ways:

•Press up and hold for one minute. This opens burner fuel and air sole- noids.

•Press down to ignite burner glow plug for up to 10 seconds.

•Repeat as necessary (if fuel and air sources are farther away than 10 feet, several more attempts may be necessary).

•If the flame has been lit, but the flame temperature increases slowly, perform the following steps:

!After igniting flame, release switch for 2 seconds

!Press switch down for 2 seconds

!Repeat release switch and press down steps as necessary.

13.Allow the case and oven to warm up, approximately 1 to 2 hours.

14.Verify that all 4 LEDs are illuminated.

Note the four LEDs on the front panel of the Analyzer Module. They provide nec- essary information for either ignition procedure. The LEDs, when illuminated, denote the following information:

•Green - unit powered on

•Amber - continuous illumination im- plies oven has reached operating temp. Within ±6°C of setpoint

•Green - Flame on

•Green - purge air system intact (it has filled five volumes of the module interior)

Rosemount Analytical Inc. A Division of Emerson Process Management

Startup and Operation 3-3