EUTECH INSTRUMENTS CYBERSCAN CON 1500 CONDUCTIVITY METER Manual de instrucciones descargar pdf (Pagina 11)

Instruction Manual PC 510

5.3 pH calibration

NOTE: We recommend that you perform at least a 2-point calibration using standard buffers that

bracket (one above and one below) the expected sample range.

5.3.1 Preparing for pH calibration

This meter is capable of up to 5-point pH calibration to ensure accuracy across the entire pH range of

the meter. Select from the following buffer options:

• USA: pH 1.68, 4.01, 7.00, 10.01 and 12.45

• NIST: pH 1.68, 4.01, 6.86, 9.18 and 12.45

The meter automatically recognises and calibrates to these standard buffer values, which makes pH

calibration faster and easier.

NOTE:

Selection of USA or NIST buffer standards must be done prior to calibration. Refer to Section

8.4 on P3.3 on page 29.

5.3.2 Before starting

Be sure to remove the protective electrode storage bottle or rubber cap

of the probe before calibration or measurement. If the electrode has

been stored dry, hydrate the probe in tap water for 10 minutes before

calibrating or taking readings to saturate the pH electrode surface and

minimise drift.

Wash your probe in de-ionised water after use, and store in electrode

storage solution. If storage solution is not available, use pH 4.01 or

7.00 buffer for short term storage. DO NOT store electrode in distilled

or de-ionised water.

5.3.3 To calibrate pH

1. If necessary, press the MODE key to select pH mode. The pH

indicator appears in the upper right hand corner of the display.

2. Rinse the probe thoroughly with de-ionised water or rinse solution.

Do not wipe the probe as this causes a build-up of electrostatic

charge on the glass surface.

3. Dip the probe into the standard calibration buffer. The end of the

probe must be completely immersed into the sample. Stir the probe

gently to create a homogeneous sample.

NOTE

: The temperature element is in the conductivity cell. For

temperature compensated readings, dip the conductivity cell or ATC

probe into the calibration buffer as well.

4. Press CAL/MEAS to enter pH calibration mode. The CAL indicator

will be shown. The primary display will show the measured reading

while the smaller secondary display will indicate the pH standard

buffer solution.

5. Wait for the measured pH value to stabilise. If the READY indicator

has been activated through the Setup, the READY appears when

the reading is stable.

6. Press ENTER to confirm calibration. The meter is now calibrated to

the current buffer. The lower display automatically scrolls through

the remaining buffer options.

• If you are performing multi-point calibration, go to step 7.

MEAS

ATC

°C

7.16

22.3

CAL

7.16

7.00

CAL

READY

7.16

7.00

CAL

READY

7.00

Figure 6: pH calibration

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 55 56

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EUTECH INSTRUMENTS CYBERSCAN CON 1500 CONDUCTIVITY METER Manual de instrucciones Pagina 11

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