Changing The Disposable Filter Unit (Dfu); Figure 7 Tsp Inlet - Teledyne T640 Standard Operating Procedure

1. Power off the pump from the Setup>Vars>Pump Control menu. Pump choices are auto, off,
and cleaning cycle. Press 'edit' and then 'off' to turn off the pump.
2. Remove the sampling inlet from the downtube.
3. Disassemble the sampling inlet (four screws on the underside of inlet base plate).
4. Carefully and thoroughly remove any dust deposits from inside the inlet.
5. Remove any insects or other debris from the filtering screen.
6. Clean all the components using water and a mild detergent, if necessary.
7. Dry all components thoroughly with a clean cloth and blow canned air through nozzles.
8. Check and, if needed, replace the o-rings located on the outside and the inside of the base
plate, and grease them with vacuum grease.
9. Re-assemble the sampling inlet, sliding the baseplate back into the base of the inlet body,
making sure to line up with the screw holes. The screws should be put back in to hand- tight
pressure.
10. Reconnect to sampling line.
11. Power up the pump from the Setup>Vars>Pump Control menu. Press 'edit' and then 'auto'
to turn the pump back on. Allow 10 minutes for the system to return to reliable operation.
Ensure the data acquisition system is reengaged.
This procedure should be repeated per the schedule in Table 6-1.

11.2 Changing the Disposable Filter Unit (DFU)

There is one DFU on the T640 for the 5.0 lpm pump
1. Power off the internal pump from the control menu: Setup> Vars> Pump > Edit> Off
>Done.

Figure 7 TSP Inlet

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DEP 03-21
Revision No. 0
November 2017