Hach SD900, User Manual

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Start or stop a program
Use the RUN/HALT PROGRAM key to start or stop a program. Up to 12 user-defined start/stop
times/dates can be set. A program must be stopped before the program or system setup can be
changed.
The status reads RUNNING (while a program runs) or HALTED (when temporarily stopped by the
user). Use the
RIGHT arrow to get information about the program while it runs.
• Power supply voltage
• Inhibit mode (none, setpoint trigger, program delay, user start, storm trigger, full bottle and setpoint
delay)
• Sample summary (number of samples tried, missed and remaining)
• Next sample information (sample number and the bottle number of the next sample)
• Flow information when variable volume is enabled (current flow and the flow since the program
started)
• Time before the next sample
• Program the start time
1. Push RUN/HALT PROGRAM .
2. Select one of the options.
Option Description
Start Starts the currently loaded program. The status changes to RUNNING.
Halt Stops the program temporarily. The status changes to HALTED.
Resume The program resumes from the point at which it was halted. The status changes to
RUNNING.
Start over The program starts from the beginning. The status changes to RUNNING.
End program Stops the currently running program. The status changes to COMPLETE.
View the program status
The current status of main and/or stormwater programs and of SDI-12 measurements can be shown.
1. Push STATUS or select STATUS from the main menu.
2. If multiple programs are in operation, select one of the programs. The program status is shown.
3. Review the program status. Push the right arrow to see additional information.
Status Description
READY The program is ready to start. The power supply voltage and the current time are shown.
RUNNING The program is in operation.
HALTED The program was stopped temporarily by the user.
COMPLETE All of the programmed sample cycles are complete, or the program was stopped by the user.
Manual operation
Use manual operation to collect a grab sample, move the distributor arm or operate the pump.
Collect a grab sample
Collect a grab sample to make sure that the sample volume is correct or to bypass the sample
program.
1. Put the tubing from the outlet side of the pump into a sample container.
2. Put the intake tubing into the sample water.
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