Electro-Chemical Devices (ECD) SMS22 - Manual (Page 31)

8. Turn the power ON for 2-3 minutes to flush all of the lines with water.
9. Turn the power switch OFF and proceed with scheduled maintenance
5.2.2 Reagent Pumps
The reagent pumps use a replaceable pump head design. There are no serviceable parts on these pump
heads, replaceable tubing or otherwise. The pump heads should be replaced yearly or when
inconsistent results are generated. Follow these steps to replace the pump heads.
1. Perform the Preparation for Pump Service, 5.2.1 above
2. Verify the power to the analyzer OFF
3. Disconnect the reagent feed tube from the pump head. Use care when disconnecting the
reagent tube to avoid spilling liquid inside the analyzer.
4. After disconnecting the feed tube, hold the tube vertically to allow the water to drain back into
the rinse water sample beaker.
5. Disconnect the reagent output line from the pump head and allow it to drain to the flow cell.
6. Remove the two screws from the face of the pump head.
7. Gently pull the pump head directly back off of the motor drive shaft.
8. Dispose of the old pump head
9. Align the keyed shaft to the new pump head and gently press it into place.
10. Re-attach the pump head to the panel with the two mounting screws. (supplied with pump
head)
11. Connect the reagent input and output lines to the pump head.
12. Follow START UP procedure (Section 4.0) when all maintenance is complete.
5.2.3 Sample Pump
The Sample pump uses the replaceable tubing design common to most peristaltic pumps. The tubing
should be replaced yearly or when inconsistent results are generated. Follow these steps to replace the
pump tubing.
1. Perform the Preparation for Pump Service, 5.2.1 above
2. Verify the power to the analyzer OFF
3. Disconnect the feed tube from the Sample Conditioning Cell and the Sensor Flow Cell. Use care
when disconnecting the tubing to avoid spilling liquid inside the analyzer.
4. Lift the Tan colored lid on the Sample feed pump all the way up to release the tubing.
5. Remove the old tubing and properly dispose of it.
6. Connect the New Tubing to the Sample Conditioning Cell and the Sensor Flow Cell.
7. Slide the new tubing into the opened pump and close the lid to secure the tubing in place.
8. Repeat the same procedure for the Mixing Pump.
9. Follow START UP procedure (Section 4.0) when all maintenance is complete.
5.2.4 Tubing and Drain
The Reagents pumps and Sample/Mixing pumps use high performance tubing designed for a one year
service life when measuring clean water samples. All tubing and fittings should be visually inspected for
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