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DOTX-45 Dissolved Oxygen System Part 7 –Calibration

DOTX-45 50 -

7.2 Temperature Calibration

The temperature calibration sequence is essentially a 1-point offset calibration

that allows adjustments of approximately ±5 °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.

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Dot-x SERIES Especificaciones Pagina 51