Mettler Toledo M400/2(X)H Especificações descarregar pdf (Página 53)

Transmitter M400/2(X)H, M400G/2XH 53

Printed in Switzerland 30 031 683

NOTE: The conductivity values at the different temperatures have to increase or decrease from

Concentration1 to Concentration2 to Concentration3 etc.. Maxima and/or minima are not permit-

ted. If the conductivity values at Temp1 are increasing with the different concentrations, they

have to increase also at the other temperatures. If the conductivity values at Temp1 are decreas-

ing with the different concentrations, they have to decrease also at the other temperatures.

8.2.3.3 pH / ORP parameters

If during the channel setup (see chapter 8.2.1 “Channel setup”) the parameter pH/ORP has been

chosen or an pH sensor based on ISM technology is connected to the transmitter, the parame-

ters drift control, buffer recognition, STC, I P, fixed Calibration temperature and the displayed

units for slope and zero point can be set resp. adjusted.

For doing this adjustments resp. settings the menu “pH”, that will be displayed, has to be cho-

sen. (see chapter 8.2.3 “Parameter related settings”).

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

ual (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 Not Done” Press ENTER Enter to ”Exit” 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 = JIS Std, HACH, CIBA, MERCK, WTW, JIS Z 8802 or

None. See Section 19 “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 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. 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].

STC RefTemp sets the temperature to which solution temperature compensation is referenced.

The displayed value and the output signal is referenced to STC RefTemp. Selecting ”No” means

solution temperature compensation is not used. The most common reference temperature is

25°C. Press [ENTER].

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Mettler Toledo M400/2(X)H Especificações Página 53