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Instruction Manual
748297-E
June 2003
3-2 Startup and Operation Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA2000 HFID
• EPROM test - Checks the
EPROM on the Analysis Com-
puter PCB.
• RAM test - Checks the RAM on
the Analysis Computer PCB.
• Power supply test - Verifies that
all internal DC voltages are within
the required tolerances.
• Network test - Checks the inter-
nal network interface.
• 20 bit ADC test - Checks the
20-bit ADC on the Analysis Com-
puter PCB by sending a DC sig-
nal through the Preamp PCB and
reading the signal back with the
20-bit ADC.
• 12 bit ADC test - Checks the
12-bit ADC on the Analysis Com-
puter PCB by sending a DC sig-
nal and reading the signal back
with the 12-bit ADC.
• Power Supply PCB test -
Checks the presence of the
Power Supply PCB by activating
the 3-way air solenoid.
• Safety PCB test - Checks the
presence of the Safety PCB by
sending a command and reading
it back.
• Case temperature test - Com-
pares the temperature read be-
tween the Preamp temperature
sensor and the case temperature
sensor. They must be within 10°C
of each other. This test some-
times fails if the case is opened.
The sensor in the Preamp will
take longer to cool off since it is in
an enclosure. Re-running the
self-test after thermal equilibrium
will produce a positive result if the
sensors are working properly.
• Oven/Sample Temperature test
- Compares the temperature read
between the sample temperature
sensor and the oven temperature
sensor. They must be within 50°C
of each other.
• The self-test can be repeated at
any time by activating the TEST
softkey in the Self Test Results
menu.
8. Set the desired oven setpoint in the
range of 93°C to 204°C (200°F to
400°F).
9. Wait for the Purge Air green LED to il-
luminate.
10. Introduce the remaining supply gases.
Perform leak check. (See Section 1-5
Specifications on page 1-4.)
11. Set and verify the internal gas pres-
sures.
INTERNAL PRESSURE REGULATOR TYPICAL OPERATING PRESSURES
Burner Air 965 to 1103 hPa-gauge (14 to 16 psig)
Fuel 1516 to 1723 hPa-gauge (22 to 25 psig)
Sample (non-adjustable) 206 to 290 hPa-gauge (3.0 to 4.0 psig)
Purge air of the following specifications must be present:
Flow: 16 to 18 L/min.
Supply Pressure: 689 to 1378 hPa-gauge (10 to 20 psig)