Mettler Toledo M400 Especificações descarregar pdf (Página 74)

Transmitter M400 74

Printed in Switzerland 52 121 378

Depending on the measured media temperature the LED of the sensor can be automatically

switched off. If the media temperature is higher then Toff, the LED will switched off. The LED will

be switched on as soon as the media temperature falls below Toff - 3K. This function give the

option to increase the lifetime of the OptoCap by switching off the LED thru SIP or CIP cycles.

NOTE: This function is only active if the operation mode of the LED is set to “Auto”.

Press [ENTER]

The operation mode of the sensor LED can also be influenced by the digital input signal DI1 of

the transmitter. If the parameter “DI 1 LED control” is set to Yes, the LED is switched off, if DI1 is

active. If “DI 1 LED control” is set to No, the signal of DI1 has now influence on the operation

mode of the sensor LED.

This function is helpful for remote control of the sensor thru a SPS or DCS.

NOTE: This function is only active if the operation mode of the LED is set to “Auto”.

Pressing the [ENTER] key 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.

8.2.3.8 Dissolved carbon dioxide parameters

If during the channel setup (see chapter 8.2.1 “Channel setup”) the parameter CO2 has been

chosen, the parameters drift control, salinity, HCO3, TotPres and the displayed units for slope

and zero point can be set resp. adjusted.

The parameter pH buffer is Mettler-9 and can not be modified. To avoid any interferences of

unknown compounds the one-point and two-point calibration can only be done by using

Mettler-9 standard buffer. For the calibration please use the solution with pH = 7.00 and/or

pH = 9.21.

For doing this adjustment resp. settings the menu “CO2”, that will be displayed, has to be cho-

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

Select 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 read-

ing. If the drift criteria is not met within 300 seconds then the calibration times out and the mes-

sage ”Calibration Not Done Press ENTER to Exit” is displayed.

The pH Buffer is given by Mettler-9 and can not be modified to avoid any interferences

of unknown compounds. For calibration purposes please use the solution with

pH = 7.00 and/or pH = 9.21.

Press [ENTER] to go on.

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Mettler Toledo M400 Especificações Página 74