Mettler Toledo M400 Especificações descarregar pdf (Página 41)

Transmitter Multiparameter M400 41

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Linear compensation adjusts the reading by a factor expressed as a ”% per °C” (deviation

from 25 °C). Use only if the sample has a well-characterized linear temperature coefﬁcient.

The factory default setting is 2.0% / °C.

8.2.3.2 pH Parameters

Select pH and press [ENTER].

Select the Drift control for calibration as Auto (drift and time criteria have to be fulﬁlled) or

Manual (The user can decide when a signal is stable enough to complete calibration)

followed by the relevant buffer table for the automatic buffer recognition. If the drift rate is less

than 0.4 mV over a 19 second interval then the reading is stable and the calibration is done

using the last reading. If the drift criteria is not met within 300 seconds then the calibration

times out and the message ”Calibration Unsuccessful Press Enter to Continue” is displayed.

For automatic buffer recognition during calibration, select the buffer solution set that will be

used: Mettler-9, Mettler-10, NIST Tech, NIST Std = JIS Std, HACH, CIBA, MERCK, WTW or None.

See Section 20 for buffer values. If the auto buffer feature will not be used or if the available

buffers are different from those above, select None.

STC is the solution temperature coefﬁcient in units of pH / °C referenced to 25 °C (Default =

0.000 for most applications). For pure waters, a setting of 0.016 pH / °C should be used. For

low conductivity power plant samples near 9 pH, a setting of 0.033 pH / °C should be used.

These positive coefﬁcients compensate for the negative temperature inﬂuence on the pH of these

samples.

IP is the isothermal point value (Default = 7.000 for most applications). For speciﬁc

compensation requirements or non standard inner buffer value, this value can be changed.

The option to enter a ﬁxed Calibration Temperature is given. ”Fixed” allows a speciﬁc

temperature value to be entered. Selecting ”No” means the Temperature conﬁgured under 8.2.2

will be used for the Calibration.

Pressing [ENTER] again will bring up the Save Changes dialog. Selecting No will discard the

entered values and return to the measurement display screen, selecting Yes will save changes

made.

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Mettler Toledo M400 Especificações Página 41