Hach-Lange POLYMETRON 9240 Operator Manual - Manual (Page 69)

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Operating Instructions
5.3.1 Verification
This option allows you to verify the measurement using a
solution of known sodium concentration.
Concentration of the known solution should be higher than 20
ppb (100 ppb is recommended) to ensure a preparation step
in a range with lower risks of contamination.
Note: This is a measurement verification cycle only, and no
adjustments to parameters or calibration data will be made.
First enter the concentration of the verification solution in the
VALID. SOL
field.
Select START to commence the process.
The first step of this cycle allows the reactivation of the
electrode. The message SENSOR ACTIVATION is displayed.
Select Yes to reactivate the sensor. Select No if time is more
important than accuracy.
The reactivation process is automatically followed by a rinsing
of the overflow vessel and measuring cell using the process
sample.
A progress bar (regularly refreshed) is displayed showing the
time remaining to complete the verification process.
Flow rate and measurements are also displayed.