Hach-Lange SURFACE SCATTER 7 sc Turbidimeter - Manual (Page 29)

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Section 4 System startup
4.1 General operation
1. Plug the SS7 sc/SS7 sc-HST into the unpowered controller by
aligning the orientation tab on the cable connector with the
channel in the controller connector.
2. Push in and turn the threaded collar to secure the connection.
Tug gently to check the connection.
3. After all plumbing and electrical connections have been
completed and checked, supply power to the system.
4. Ensure the sample unit door is securely latched when power is
applied, since dark readings are measured at this time. If power
is applied while the door is open, cycle the power with the door
closed. The dark readings are measured again one hour after
the power-up.
5. The first time a controller is powered up, a language selection
menu will appear. Select the correct language from the
displayed options.
6. Following language selection and upon power-up, the controller
will search for connected sensors. The display will show the
main measurement screen.
4.2 Starting sample flow
1. Start sample flow through the instrument by opening the
sample supply valve.
2. Allow the turbidimeter to run long enough for the tubing and
body to become completely wetted and the reading on the
display to stabilize. One to two hours or longer may be required
initially for complete stabilization.
3. Allow measurements to become stable through adequate
conditioning before completing instrument settings or
performing calibrations.