GE VMIVME-7751 VME Single Board Computer
3.3.1 Oven LED indicators
Each oven has three LED indicators (see Figure 3-6) which show the current status of the oven.
If the LEDs are not lit, check power to the unit.
If the top LED is green and flashing, the system is initializing.
For all other situations use the following table.
Table 3-3: LED indicators
Position Red Amber Green
Top Oven Idle Future Use Executing Analysis
Middle DTC Malfunction Low Oven Air and/or Carrier Gas Alarm DTC Operation Normal
Bottom FID/FPD Flame Out Future Use FID/FPD Flame Lit
3.3.2 Oven regulators and gauges
If there is one pair of regulators and gauges, they control both oven and heater air.
If there are two pairs of regulators and gauges, one pair controls oven and heater air and the other
pair controls purge and valve air.
3.4 Start the analyzer
1. Visually inspect the analyzer for inoperative or damaged gauges, loose or damaged
connections, and overall condition.
2. Turn on the instrument air at its source.
IMPORTANT NOTE: Refer to the Data Package to ensure that air supply at the specified pressure
is provided to the INSTRUMENT AIR inlet. The purge air and heater air pressures should be as
specified on the label below the corresponding regulator.
3. Turn on carrier gas at its source.
IMPORTANT NOTE: Refer to the Data Package to ensure that the specified carrier gas is provided
at the specified pressure to each CARRIER inlet.
If the analyzer is equipped with enclosure purge, refer to the sales order tag for specified flow rate
and purge time before applying electrical power

4. Turn the power ON at the external circuit breaker or switch.
5. Verify any auxiliary gases in the same manner as the Carrier gas.
6. Check for leaks. If a leak occurs during startup, perform the leak checks described in sections
3.4.1 and 3.4.2.
7. Allow sufficient time for oven warm-up. (Temperatures are set during installation). The oven
should stabilize at the temperature indicated in the Data Package. If adjustments are required,
adjust the Digital Temperature Controller as described on the Setup Tab > DTC (Digital
Temperature Controller).
3.4.1 Leak check oven
Leak check is recommended at startup or if an internal carrier gas leak is suspected. Perform a simple
leak check on the oven as follows (see Figure 3-7):
Figure 3-7: Leak Check Oven Example
1. Plug all oven carrier gas vents as applicable: backflush vent(s), selector vent, detector vent(s)
and splitter vent.
2. Under the Setup tab at the user interface, disable burner air and hydrogen fuel zones if
applicable.
3. Set carrier pressure to factory settings.
4. Wait five minutes for pressure to equilibrate.
5. Set carrier pressure to zero psig.
IMPORTANT NOTE: You may observe an initial drop in pressure when setting the carrier pressure
to zero psig. After the initial drop, record the reading and wait 30 minutes. The pressure should
hold. Any decline is excessive and indicates a potential leak.
6. Check for leaks using a suitable leak detection solution. Starting at the inlet to the detector,
work back to the carrier gas supply, plugging the exit of each valve or column to locate the
leak.
3.4.2 Leak check carrier gas supply lines
Check for leaks during initial installation by performing a simple leak check on the utility gases as
applicable:
1. Ensure all power is off.
2. Pressurize all lines to 90 psig.
3. Wait five minutes for pressure to equilibrate.
4. Set supply regulator to zero (0) psi.
5. If pressure bleeds off, repeat steps 1 to 4 and use a suitable leak detection solution to check
for leaks between the carrier gas supply and the ovens.
3.5 Calibrate the analyzer
Use the Setup tab to enter the calibration concentration for all components being calibrated. Follow
the steps below to calibrate using either the LUI or RUI.