EUTECH INSTRUMENTS alpha-pH 2000D Manual de instrucciones descargar pdf (Pagina 22)

Instruction Manual αlpha-pH2000D

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5.3 ORP-mV Calibration

If controller is configured for ORP-mV measuring you can perform a one-point calibration.

MEAS

CAL

HOLD

CAL

HOLD

R.mV

CAL

250

255

250

1. Enter Calibration mode as described in section 5.1. The display should read “CAL ORP”.

Note: If the display reads “CAL PH”, see section 6.9 for procedures on how to switch

from pH to ORP-mV readings.

2. Place sensor in the ORP solution.

3. Press the ENT key to start calibration. The “CAL”, buffer and electrode indicator appears on

the display. The upper and lower display shows the current mV output of the electrode without

any offset adjustment.

4. Press the ▲ or ▼ key to adjust the upper display mV value to match your exact reading.

5. Press the ENT key (or CAL key) to confirm. The controller calculates the correction factor and

returns to the Measurement mode. The “R.mV” annunciator (Relative mV) will be shown on the

display indicating that the value displayed is the relative mV value of the default measurement.

5.4 ORP -% Calibration

If controller is configured for ORP-% measuring you can perform a calibration at two points

using a low concentration sample (20%) and a high concentrate sample (80%). To calibrate

the controller for ORP %:

CAL

MEAS

59.0

CAL

HOLD

CAL

HOLD

C.1

C.2

1. Enter Calibration mode as described in section 5.1. The display should read “CAL ORP”.

Note: If the display reads “CAL PH”, see section 6.9 for procedures on how to switch

from pH to ORP-mV readings.

2. Press the ENT key to start calibration. The display prompts you to place the sensor in the high

concentration sample (relative value of 80%).

3. Place sensor in high concentration sample, then press the ENT key (or CAL key). The

electrode and CAL indicators flash. The unit automatically adjusts its reading to match the

solution value.

4. The display prompts you to place the sensor in the low concentration sample (relative value of

20%). Remove the electrode from the first standard, wash it well and then immerse it in the 20%

standard.

5. When the display stabilizes press the ENT key (or CAL key). The electrode and “CAL”

indicator flashes and the controller adjust its display to the 20% relative value and exits to the

Measurement mode.

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