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The analyzer and sensor can be calibrated against a standard instrument. For oxygen sensors installed in aera-
tion basins in waste treatment plants, calibration against a second instrument is often preferred. For an accurate
calibration be sure that…
1. The standard instrument has been zeroed and calibrated against water-saturated air following the manufac-
turer's instructions.
2. The standard sensor is immersed in the liquid as close to the process sensor as possible.
3. Adequate time is allowed for the standard sensor to stabilize before calibrating the process instrument.
7.4 CALIBRATING THE SENSOR AGAINST A STANDARD INSTRUMENT
MODEL DO-03/04 SECTION 7.0
CALIBRATION - DISSOLVED OXYGEN
4. From the main display, press any key to obtain the main menu. With
the cursor on “Calibrate,” press Enter (F4).
NOTE
If Hold was enabled in Section 5.5, the hold screen will appear.
To activate hold, refer to Section 5.5, step 9.
Press Enter (F4).
5. The screen at left appears. Press the key once to move the cursor
to “Calibrate in process.” Then, press Enter (F4).
6. Press Cont (F3). “Wait” flashes until the sensor is stabilized.
If the analyzer appears locked, the reading is not stable enough.
Increase the amount the concentration is permitted to vary or
decrease the stabilization time. See Section 5.10. Repeat the calibra-
tion. To proceed with the calibration as is, press Cont (F3).
7. Once the reading is stable, the screen at left appears. Press Edit
(F4). Use the arrow keys to change the concentration in the second
line of the display to the desired value. Press Save (F4) to store the
value.
8. Press Exit (F1) four times to return to the main display.
NOTE
If Hold was activated during calibration, “Hold Mode Activated”
will continue to flash in the main display. Return the sensor to
normal and deactivate Hold. Refer to Section 5.5, step 9.
Calibrate main sensor
Zero main sensor
Adjust temperature
Exit Enter
Calibrate in air
Calibrate in process
Barometric pressure
Exit Enter
8.32 ppm
Stabilizing . . . Wait
Abort Cont
8.32 ppm
Calibrate : 8.32 ppm
Exit Edit
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