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Total Organic Carbon Analyzer Maintenance
Teledyne Analytical Instruments 59
Figure 5-10: Removing the UV Power Supply
5.3.9 Mass Flow Controller (P/N ST18001A)
If proper flow is not detected by the computer, an alarm will be
activated and displayed. The fault may be in the O
2
/Air supply (check
for 20 psi and flow of the supply by disconnecting the input). If supply
flow exists, fault may be in the tubing. Disconnect output side of mass
flow controller and check for flow. If no flow exists, exchange mass
flow controller as described below. See Figure 5-11. If flow still does
not exist, check rest of tubing for restrictions, leaks, etc.
To remove the mass flow controller:
1. Shut off Power to Instruments.
2. Shut off all gas to analyzer and bleed system for “O”
pressure.
3. Disconnect fittings/tubing.
4. Loosen screws holding Module in-place.
5. Remove Module
6. Recalibrate analyzer after re-installation of exchange
Module.