Concurrent Calibration Of Two Sensors - Hach LDO User Manual

Operation

5.6.4 Concurrent Calibration of Two Sensors

Calibration Response
Cal Complete
Cal Fail, Offset HIgh
Cal Fail, Offset Low
Cal Fail, Unstable
26
5. Select CALIBRATE and confirm.
6. Select SAMPLE CAL. Select the available Output Mode (Active, Hold, or Transfer)
from the list box and confirm.
7. The display will show "Press
temperature readings. When the reading has been confirmed or when the reading has
been accepted as stable, the display will change to an entry screen. If
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".
8. 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.
9. Change the displayed reading to match the hand-held DO analyzer memory.
10. After calibration, one of the responses in
1. Begin a calibration on the first sensor and proceed when "Wait to Stabilize" is
displayed.
2. Select the arrow, then LEAVE. The display will return to the Main Measurement
BACK
screen.
3. Begin the calibration for the second sensor and continue until "Wait to Stabilize" is
displayed.
4. Select the arrow, then LEAVE. The display will return to the Main Measurement
BACK
screen and the reading for both sensors will be flashing.
5. To return to the calibration of either sensor, select the Main Menu button. Select
SENSOR SETUP and confirm. Select the appropriate sensor and confirm
6. The calibration in progress will be displayed. Continue with the calibration.
Table 5 Calibration Response
Explanation
Indicates the Calibration is complete.
Indicates the air calibration has failed due to an excessively high calculated gain value. Repeat the
calibration.
Indicates the air calibration has failed due to too low of a calculated gain value. Repeat the
calibration.
Indicates the air calibration has failed because the readings did not stabilize during the maximum
allowed calibration time interval. Repeat the calibration.
when Stabilized" and the current DO and
ENTER
Table 5 on page 26
is not
ENTER
will be displayed.
.