Hach 5740sc, Руководство пользователя, Страница: 32 / 50

32
sc1000 Operation
5.7.3 Sample Cal—Calibration by Comparison to a Hand-held DO Analyzer
1. Place the dissolved oxygen sensor as close to the LDO sensor as possible.
2. Wait for the hand-held DO analyzer to stabilize.
3. Tap the bottom-left of the screen to display the pop-up toolbar and press
MAIN MENU
.
4. From the Main Menu, select SENSOR SETUP and press
ENTER
.
5. Select the appropriate sensor if more than one is attached and press
ENTER
.
6. Select CALIBRATE and press
ENTER
.
7. 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
to confirm.
8. 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”.
9. When a stable reading has been accepted, the display will show “Sample Cal” and an
area for entry of the value obtained from the Winkler Titration.
10. Change the displayed reading to match the hand-held DO analyzer memory.
11. After calibration, one of the responses in Table 6 on page 33 will be displayed.
5.7.4 Concurrent Calibration of Two Sensors
1. Begin a calibration on the first sensor and proceed when “Wait to Stabilize” is
displayed.
2. Select the
BACK
arrow, then LEAVE. The display will return to the Main Measurement
screen.
3. Begin the calibration for the second sensor and continue until “Wait to Stabilize” is
displayed.
4. Select the
BACK
arrow, then LEAVE. The display will return to the Main Measurement
screen and the reading for both sensors will be flashing.
5. To return to the calibration of either sensor, tap the bottom of the screen to display the
pop-up toolbar. Select the Main Menu button. Select SENSOR SETUP and press
ENTER
. Select the appropriate sensor and
ENTER.
6. The calibration in progress will be displayed. Continue with the calibration.
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