Hach-Lange Sigma SD900 Portable - Manual (Page 52)

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Sampler operation
4.9.3.4 Reset tubing cycles
When the “change tube” message is shown, replace the pump
tubing and then reset the pump cycles.
Procedure:
1. If the tubing life option is not enabled, select
SYSTEM SETUP > TUBING LIFE > ENABLE > RESET CYCLES . If the
tubing life option is enabled, select
SYSTEM SETUP > TUBING LIFE > RESET CYCLES .
2. Select YES to reset the pump cycle count to 0. Press ENTER to
view the status screen to verify that the cycle count is set to 0.
Note: It is important to reset the pump cycles so that the change tube
message will be shown at the correct time for the new tube.