EUTECH INSTRUMENTS WP PCD 650 Manuál s instrukcemi stáhnout pdf (Strana 49)

Instruction Manual PCD 650

Hence calibration in % Saturation of DO should be carried out first. This is

described in the following section.

3.1.6 Prepare the Meter for Calibration

Before starting calibration, make sure the meter is in the appropriate

measurement mode.

For pH

Connect the pH probe to the BNC connector of the meter.

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

electrode before calibration or measurement. If the electrode has been

stored dry, wet the electrode in clean water for 10 minutes before calibrating

or taking readings to saturate the pH electrode surface and minimize drift.

Wash your electrode in clean water after use, and store in electrode storage

solution. If storage solution is not available, use pH 4.01 or 7.00 buffer

solution. Do not reuse buffer solutions after calibration. Contaminants in the

solution can affect the calibration, and eventually the accuracy of the

measurements.

It is recommended that you perform at least a 2-Point Calibration using

standard buffers that adequately cover the expected measurement range,

prior to measurement.

For Ion

Connect the ISE to the BNC connector of the meter.

Remove plastic protective cap of ISE. Briefly rinse the electrode with clean

clean water to remove any residues. Rinse ISE before and after each

calibration or sample measurement to avoid cross-contamination. Ensure that

you use new or fresh standard solutions during calibration. Do not reuse Ion

standard solution as it may be contaminated and affect the calibration and

accuracy of measurements.

For Conductivity

Connect the conductivity probe with built-in temperature sensor into the 8-pin

connector of the meter.

For best results, select a standard value close to the sample value you are

measuring. Alternatively use a calibration solution value that is approximately

2/3 the full-scale value of the measurement range you plan to use. For

example, in the 0 to 2000 µS conductivity range, use a 1413 µS solution for

calibration.

Perform calibration for all measurement ranges to ensure the highest

accuracy throughout all measurement range. Calibration for different ranges

is indicated in the Technical Specifications table on page 5, calibration

factors are applied only to their respective ranges

If you are measuring in solutions with Conductivity lower than 100 µS/cm or

TDS lower than 50 ppm, calibrate the meter at least once a week to get good

accuracy. If you are measuring in the mid ranges and you wash the electrode

in de-ionized water and store it dry, calibrate the meter once a month. If you

take measurements at extreme temperatures, calibrate at least once a week.

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