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TAI Model 6400A SO
Without leaving DIAG menu, Scroll until PMT_SIGNAL is shown. It should display near
0 ± 200 mV. If reading is greater than +200 mV, then verify if + 12VDC is supplied for the terminal
located at the shutter cover (see Figure 9-7). If + 12VDC is present, then open the shutter cover and
verify if shutter or solenoid is mechanically faulty. Replace as necessary.
9.5 Pneumatic System Troubleshooting
The pneumatic system is diagrammed in Figure 8-3 depending on which options the instrument
was ordered with.
9.5.1 Leak Check
When doing a leak check do not pressurize the 6400A to greater than 15psig.
Damage to internal components will occur at higher pressures.
Many performance problems cause is a leak. Refer to Section 8.8 for the leak check procedure.
9.5.2 Pump
The internal vacuum pump is capable of 14"Hg Abs pressure at 1 slpm or better to maintain
critical flow. Plug inlet of the rear panel and if higher pressures are noted, the pump may need
servicing. Pneumatic leak also can cause higher pressure.
9.5.3 Kicker
The Kicker assembly consists of the membrane tube and Teflon tube. The pump creates the
vacuum between the membrane and the Teflon tube causing a differential pressure. Poly-nuclear
Hydrocarbon in the sample is removed while passing through membrane tube by this differential
pressure. Leak check as Section 8.8 and flow check as in Section 9.2.2. An internal leak of the
Kicker is difficult to find. Leak check only the membrane tube as followings to determine
internal leak of the kicker (you need leak checker to perform this procedure).
One end of the kicker is connected to the sample particulate filter assembly and the other end is
connected to the reaction cell assembly. Both ends are made of the 1/8" black Teflon tubing. Cap one
end of the kicker and pressurize the other end of the kicker using leak checker (refer to Figure 9-11). Do
not exceed pressure more than 15 psi and do not pull the vacuum through the Kicker.
1. Close the shut-off valve. If the gauge pressure drops 1 psi within 5 minutes, then kicker has
internal leak. The kicker assembly is only factory serviceable.
Analyzer Operator Manual, 02164, Rev. G
2
CAUTION
9-60
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Table of Contents
Troubleshooting
