Mettler Toledo M300 ISM Specifikace stáhnout pdf (Strana 58)

Transmitter M300 58

Printed in Switzerland 52 121 389

Lin 20 °C compensation adjusts the reading by a factor expressed as a ”% per °C” (deviation

from 20 °C). Use only if the solution has a well-characterized linear temperature coefficient. The

factory default setting is 2.0% / °C.

If compensation mode ”Lin 25 °C” or ”Lin 20 °C” has been chosen, the factor for the adjustment

of the reading can be modified after pressing [ENTER] (If working at measurement line a or b

press [ENTER] twice).

Pressing [ENTER] 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.

* On Thornton models only.

8.2.4.2 pH/ORPParameters

Select pH and press [ENTER].

Select the drift control for calibration as Auto (stabilisation 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 0.8 mV over a 20 second interval then the reading is stable and the calibration is done us-

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

times out and the message ”Calibration not done” is displayed. Press [ENTER].

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

Mettler-9, Mettler-10, NIST Tech, NIST Std, HACH, CIBA, MERCK, WTW, JIS Z 8802 or None. See

Section 20 ”Buffer Tables” for buffer values. If the auto buffer feature will not be used or if the

available buffers are different from those above, select None. Press [ENTER].

 NOTE: For dual membrane pH electrodes (pH/pNa) only buffer Na+ 3.9M (see section 19.2.1

“Mettler-pH/pNa buffers”) is available.

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 con-

ductivity power plant samples near 9 pH, a setting of 0.033 pH/°C should be used. These posi-

tive coefficients compensate for the negative temperature influence on the pH of these samples.

Press [ENTER].

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

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

Press [ENTER].

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Mettler Toledo M300 ISM Specifikace Strana 58