Dot-x SERIES Especificaciones descargar pdf (Pagina 50)

DOTX-45 Dissolved Oxygen System Part 7 –Calibration

DOTX-45 49 -

These steps below assume that the sensor has been prepared in accordance

with section 5, Dissolved Oxygen Sensor Assembly, earlier in this manual. Note

that the 10 hour waiting time in step 2 below is not required if the monitor has

been running for 24 hours prior to zeroing. If the unit has been running with the

sensor connected, the sensor will normally return to a stable zero within 15

minutes.

1. Remove the sensor from the application if necessary. Clean and rinse if

required.

2. Place about an inch of zero solution in a small beaker or other convenient

container and immerse the tip of the sensor. Allow the sensor to sit

undisturbed for at least 1 hour. Suspend sensor, DO NOT LET SENSOR SIT

ON TIP.

3. Scroll to the CAL menu section using the MENU key and press ENTER or the

UP arrow key. Cal D.O. will then be displayed.

4. Press the ENTER key. The screen will display a flashing 1-spl for 1-point, a

%-sat for Saturation air calibration, or a 3-zer for zero calibration. Using the

UP arrow key, set for a 3-Zer zero calibration and press ENTER.

5. The system now begins acquiring data for the sensor zero calibration value.

As data is gathered, the units for sensor millivolts (mV) and temperature may

flash. Flashing units indicate that this parameter is unstable. The calibration

data point acquisition will stop only when the data remains stable for a pre-

determined amount of time. This can be overridden by pressing ENTER.

6. If the data remains unstable for 10 minutes, the calibration will fail and the

message Cal Unstable will be displayed.

7. If accepted, the screen will display the message PASS with the new sensor

zero reading (offset), then it will return to the main measurement display. If

the calibration fails, a message indicating the cause of the failure will be

displayed and the FAIL icon will be turned on. The range of acceptable value

for sensor offset is -40 mV to +40 mV. Should a FAIL occur, carefully inspect

the sensor for a tear in the membrane. It will probably be necessary to

rebuild the sensor as described in section 5, Dissolved Oxygen Sensor

Assembly. Should the offset value remain high and result in calibration

failures, review the Service section of this manual.

The sensor offset value in mV from the last zero calibration is displayed on the

lower line of the Default Menus for information purposes.

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 68 69

Sin comentarios

Dot-x SERIES Especificaciones Pagina 50