EUTECH INSTRUMENTS WP PCD 650 Instrukcja Obsługi Pobierz pdf (Strona 47)

Instruction Manual PCD 650

3. Calibration Mode

3.1 About Calibration

PCD 650 series meters are factory calibrated and allows you to measure

pH/mV/ion/conductivity/resistivity/TDS/salinity/DO(%)/DO(mg/L). Calibrate to

all measurement ranges to ensure the highest accuracy throughout all

measurement range. However, it is recommended that, for higher accuracy,

you calibrate your meter before you make measurements for the first time.

Calibration should be carried out each time a new electrode is attached to the

meter or when you suspect that the meter/electrode is out of calibration.

3.1.1 About Temperature Calibration

It is important to ensure that temperature calibration is carried out prior to pH,

conductivity and DO calibration since temperature readings affect the

accuracy of pH, conductivity and DO measurements. You need to perform

temperature calibration only if the temperature value displayed on the meter

is different from that of a calibrated thermometer or if cell constant setting is

changed. A temperature offset calibration of ± 5 °C/± 9 °F from the default

reading is allowed for ATC mode.

3.1.2 About pH Calibration

When you re-calibrate your meter, previous pH calibration points are

replaced on a point by point basis. For example, if you previously calibrated

your meter at pH 4.01, 7.00, and 10.01, and you have now re-calibrated at

pH 7.00, the meter retains the old calibration data at pH 4.01 and pH 10.01.

The meter shows previously calibrated points in the display when the meter is

in pH measurement mode. To completely re-calibrate the meter, or when you

use a replacement probe, it is best to clear the previous calibration and re-

calibrate the meter at all points. Refer page 46 for information on how to

clear previous pH calibration.

The meter supports four internationally recognized standard buffer groups:

USA, NIST, DIN & PWB. The default buffer group is USA. Refer page 82 for

information on how to set the meter to a particular buffer group

The meter is capable of calibrating up to 6 points, depending on the standard

buffer selected. When completely re-calibrating the meter, the first point of

calibration should be one of the following, depending on your choice of

standard buffer group.

Table 2: Buffer Groups and Calibration Points

Buffer

Group

First Point of Calibration

(when complete re-calibration)

Other Available Calibration Points

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

NIST pH 6.86 pH 4.01, 6.86, 9.18, and 12.45

DIN pH 6.79 pH 1.09, 3.06, 4.65, 9.23, and 12.75

PWB pH 6.97 pH 4.10

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 119 120

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