EUTECH INSTRUMENTS WP PCD 650 Manuel d'instructions télécharger pdf (Page 77)

Instruction Manual PCD 650

3.11 DO Calibration in mg/L or ppm Concentration Mode

The amount of oxygen dissolved in a liquid will depend on its temperature, pressure

and salinity. It is therefore very important to set temperature and salinity correctly

before attempting to do a calibration. The PCD 650 is capable of measuring

barometer pressure with its built-in pressure sensor. In the event, the pressure

reading is inaccurate, you can calibrate the value from the Setup menu.

1. Switch on the meter. Make sure the meter is in concentration measurement

mode.

2. Rinse the probe well with de-ionized rinse water. For best accuracy, blot

the end of the probe dry. Dip the probe into a solution whose DO values is

known. Do not touch the membrane.

3. Press CAL (F2) to go to calibration mode.

4. The meter shows ‘Dissolved O

Calibration-Rinse Electrode’ screen [Figure

48-(a)] for few seconds to prompt user to rinse electrode with de-ionized

water before calibration.

(a) (b)

Figure 62 : Concentration calibration screens

5. The meter then shows the concentration calibration screen [Figure 62(a)].

6. The upper display of the calibration screen [Figure 62(b)] will show the

current value of the measurement and the secondary display will show the

value to which the meter is going to be calibrated. Press

& keys to

adjust the reading to the known oxygen concentration of the sample.

7. Press ENTER key to confirm the entered value.

8. Press ESC (F4) to go to measurement mode. The meter shows the

concentration reading of the solution in measurement mode (Figure 63).

Note: If the meter is password protected, you will be prompted to enter

a password. Refer ‘Accessing Calibration mode when password

protection enabled’ in pa

e 42.

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EUTECH INSTRUMENTS WP PCD 650 Manuel d'instructions Page 77