Hach 5740sc, Руководство пользователя, Страница: 31 / 50

31
sc1000 Operation
5.7.2 Sample Cal—Calibration by Comparison to a Winkler Titration
1. Tap the bottom-left of the screen to display the pop-up toolbar and press
MAIN MENU
.
2. From the Main Menu, select SENSOR SETUP and press
ENTER
.
3. Select the appropriate sensor if more than one is attached and press
ENTER
.
4. Select CALIBRATE and press
ENTER
.
5. Select SAMPLE CAL and tap on the dark-blue highlighted area to the far-right. Select
the available Output Mode (Active, Hold, or Transfer) from the list box and press
ENTER
.
Note: An output that has been placed in Hold or Transfer status will be automatically released when
the calibration is complete.
6. Remove the sensor from the process stream and gently wipe with a wet cloth to
remove all debris and biological growth. Remaining debris will affect the Winkler
Method of analysis.
7. Measure 1000 mL of deionized water. Allow the water to come to the thermal and
dissolved oxygen equilibrium (approximately 20 minutes).
8. Fill a standard BOD bottle and then place the sensor in a beaker containing the
remainder of the deionized water.
9. Perform the Winkler Tritration using Cat. No. 1469-00 Winkler Test Kit on the deionized
water in the BOD bottle while waiting for the process sensor to stabilize.
10. Move the sensor to the sample.
11. The display will show “Press
ENTER
when Stabilized” and the current DO and
temperature readings. When
ENTER
is pressed or when the reading has been
accepted as stable, the display will change to an entry screen. If
ENTER
is not
pressed, the sensor will determine when the reading is stable. Two to three minutes
for the reading to stabilize is typical, however, if it has not stabilized after 45 minutes,
the display will show “Unable to Calibrate”.
12. When a stable reading has been accepted, the display will show “Sample Cal” and an
area for entry of the value obtained from the comparison method. When the entry
screen is displayed, enter the value from the hand-held or winkler titration and press
ENTER
.
13. After calibration, one of the responses in Table 6 on page 33 will be displayed.
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