Teledyne 465M instruction manual Sample Pump Replacement, Auto-Zero Valve Replacement

9.Reconnect power to the instrument and turn on power switch. Let instrument warm up for at least 20 minutes.

10.Perform UV lamp adjustment procedure per Section 9.4.

9.6.Sample Pump Replacement

1.Disconnect power from the M465M.

2.Remove the six screws and the top cover (Rack Mount Configuration) or open front panel (NEMA Configuration.)

3.Locate sample pump assembly (See Figure 9-1or Figure 9-2.)

4.Cut off the clamps holding the Tygon tubing to the pump nipples and remove tubing. Note which tubing is connected to inlet and outlet.

5.Unplug the pump power connector from the mainboard PCA at connector J12.

6.Remove the four screws attaching the sample pump assembly to the chassis.

7.Turn over pump assembly and remove the two screws holding the sheet-metal base to the pump.

8.Install the base on the new pump.

9.Install new pump assembly in chassis.

10.Cut off the ends of the used Tygon tubing and reconnect tubing; note that outlet fitting of pump should be connected to tubing routed to the ‘Exhaust’ fitting on rear panel.

11.Re-install new tubing clamps or cable-ties to secure tubing connections.

9.7.Auto-Zero Valve Replacement

1.Disconnect power from the M465M.

2.Remove the six screws and the top cover (Rack Mount Configuration) or open front panel (NEMA Configuration.)

3.Locate the auto-zero valve (See Figure 9-1or Figure 9-2.)

4.Unplug the two-pin valve connector from the mainboard PCA.

5.Remove the silver retainer clip from the top of the sensor valve. A pair of pliers may be used to slide off the retainer clip.

6.The valve coil can now be removed by sliding upwards.

7.Remove the two (2) mounting screws using a #2 Phillips screwdriver. Note that there are four screw heads visible on the top of the valve body, only two (2) of

P/N 06160D DCN6409 Teledyne API Model 465M O3 Monitor Instruction Manual - Page 57