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20 Thermo Scientific Alpha pH 560

calibration mode, the pH Controller reverts back to ‘process

temperature’.

Make sure that the pH Controller is set to accept NIST standard buffer

in the Setup mode. (Refer Page 16) The factory default is USA

standard. It is recommended that you perform 2-point calibration at

room temperature (25

C), starting with the first buffer at pH 6.86

followed by any other buffer value. (pH 4.01, 1.68, 9.18 or 12.45)

Figure 4–17. NIST Buffer Single-Point Calibration

From pH measurement mode press CAL key to enter

calibration mode as described in page 16. The LCD shows

‘CAL PH’. Press ENT key to begin calibration.

Place the electrode in pH 6.86 buffer. Immerse the

temperature probe in the buffer solution if ATC mode is

enabled. Immerse the potential matching pin in the buffer if

symmetrical mode is enabled. The buffer annunciator

appears in LCD. Lower display shows pH 6.86 (NIST

standard buffer). Upper display shows the current

uncalibrated pH reading. Allow the reading to stabilize.

LCD shows ‘READY’ annunciator when the reading is

stable.

Press CAL key to confirm the reading.

The calibration is completed. The pH Controller re-

calculates electrode properties based on the calibration. The

new slope (in mV) is shown in the upper display and pH

reading at 0mV (pH7.00 ± offset) is shown in the lower

display.

Press ENT key to exit from the calibration.

The pH Controller reverts to pH measurement mode.

For NIST Buffer

1-Point Calibration:

2-Point Calibration:

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EUTECH INSTRUMENTS alpha-pH 2000D Manuale delle Istruzioni Pagina 25