Hach-Lange 1720E Low Range Turbidimeter - Manual (Page 19)

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Section 4 System Startup
4.1 General Operation
Plug the sensor into the unpowered controller by aligning the orientation tab on the cable
connector with the channel in the controller connector. Push in and turn to secure the
connection. Tug gently to check the connection.
After all plumbing and electrical connections have been completed and checked, place the
head on the body and supply power to the system. Ensure the head is seated on the body
when power is applied, since dark readings are measured at this time. If power is applied
while the sensor head is off the turbidimeter body, cycle the power with the sensor head on
the body.
The first time a controller is powered up, a language selection menu will appear. The user
must select the correct language from the displayed options.
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
Start sample flow through the instrument by opening the sample supply valve. 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. Allow measurements to become stable through adequate
conditioning before completing instrument settings or performing calibrations.