Teledyne 402REU - Hydrocarbon analyzer - Manual (Page 30)

Chapter 4 Model 402 R-EU
Teledyne Analytical Instruments 4-6
4.5.4 Fuel
1. Make sure that the valve on the regulated side of the fuel
tank is closed.
2. Open the main valve on the tank and set the fuel tank
pressure regulator to 30 psig (or to match sample pressure).
3. To avoid pressure shock to the instrument fuel regulator,
slowly open the secondary valve until it is wide open.
4. Set the instrument fuel regulator to the recommended pressure.
See Figure 4-2.
NOTE: When adjusting fuel settings, the front panel switch must be held in
the IGNITE position.
4.6 Flame Ignition
Observe that after 1 hour preheating of the sensor, the amber heater
lamp is blinking (indicating that the temperature controller is maintaining
the temperature setpoint) and the red flame failure lamp is on. See Figure
4-1.
With the gas selector valve in the SPAN position and the range switch
in the highest range, turn the range switch to the IGNITE position and
release as soon as the meter is upscale (or off scale) and the red flame
failure light turns off, indicating flame on (no flame failure).
Limit the time that the switch is held in the IGNITE position to
intervals of about 5 seconds, with similar intervals of time between ignite
cycles, until the flame stays lit (and the light stays off). Such a procedure
will prevent damage to the anode-igniter electrode through overheating.
4.6.1 Verification of the Flame Guard Circuit
The operation of the flame guard circuit has been checked at the
factory, but should be re-verified during start-up. Employ the following
procedure, once ignition of the flame has been achieved:
1. Turn off the fuel at the supply cylinder.
2. Observe the fuel pressure gauge on the analyzer control panel.
The gauge indication will decay as the fuel in the line is
exhausted. When the gauge reading reaches the vicinity of 5
lbs, the flame will be extinguish as the fuel solenoid shuts off