Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 71)

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Advanced sampling
In a LOW SETPOINT condition ( Figure 31 ), the trigger becomes
active when the decreasing pH measurement value reaches 7.0.
The trigger condition does not clear until the pH measurement
value rises to 7.10 (the setpoint value plus the deadband value).
Enter a set point trigger within the allowable range.
Enter an optional deadband value.
Select ENABLE to store the trigger definition.
Select DISABLE to remove the existing trigger definition.
Once a trigger definition has been enabled, choose SETPT
CONTROL to define how the sample program is controlled.
Figure 31 Low Setpoint
1 pH values scale 4 Deadband
2 Setpoint trigger On (Time-stamp recorded in event log) 5 Setpoint (7.00)
3 Setpoint trigger Off (Time-stamp recorded in event log 6 Scan Intervals