Instruction Manual

748297-E June 2003

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

INTERNAL PRESSURE REGULATOR

Burner Air

Fuel

Sample (non-adjustable)

sensor. They must be within 10°C of each other. This test sometimes 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.

TYPICAL OPERATING PRESSURES 965 to 1103 hPa-gauge (14 to 16 psig) 1516 to 1723 hPa-gauge (22 to 25 psig) 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)

3-2 Startup and Operation

Rosemount Analytical Inc. A Division of Emerson Process Management