ATI
Q46D-ODO Optical D.O. System
Part 6 - Calibration
53
O&M Manual
Rev-J (8/17)
Cable length
Temperature off-set
30 m (98 ft)
-1.09º C
50 m (164 ft)
-1.82º C
61 m (200 ft)
-1.90º C
The sensor temperature may be calibrated on line, or the sensor can be
removed from the process and placed into a known solution temperature
reference. In any case, it is critical that the sensor be allowed to reach
temperature equilibrium with the solution in order to provide the highest
accuracy. When moving the sensor between widely different temperature
conditions, it may be necessary to allow the sensor to stabilize as much as
one hour before the calibration sequence is initiated. If the sensor is on-
line, the user may want to set the output HOLD feature prior to calibration
to lock out any output fluctuations.
1. Scroll to the CAL menu section using the MENU key and press ENTER
or the UP arrow key.
2. Press the UP arrow key until
Cal Temp
is displayed.
3. Press the ENTER key. The message
Place sensor in solution then
press ENTER
will be displayed. Move the sensor into the calibration
reference (if it hasn’t been moved already) and wait for temperature
equilibrium to be achieved. Press ENTER to begin the calibration
sequence.
4. The calibration data gathering process will begin. The message
Wait
will flash as data is accumulated and analyzed. The
°C
or
°F
symbol
may flash periodically if the reading is too unstable.
5. The message
Adjust value - press ENTER
will be displayed, and the
right-most digit will begin to flash, indicating that the value can be
modified. Using the UP and LEFT arrow keys, modify the value to the
known ref solution temperature. Adjustments up to ± 5°C from the
factory calibrated temperature are allowed. Press ENTER.
Once completed, the display will indicate
PASS
or
FAIL
. If the unit fails,
the temperature adjustment may be out of range, the sensor may not have
achieved complete temperature equilibrium, or there may be a problem
with the temperature element. In the event of calibration failure, it is
recommended to attempt the calibration again immediately.
