
Transmitter M400 71
© 02 / 2010 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter M400
Printed in Switzerland 52 121 378
8.2.3.3 ISFET parameters
If during the channel setup (see chapter 8.2.1 “Channel setup”) the parameter ISFET has been
chosen, the parameters drift control, buffer recognition, STC, IP, fixed Calibration temperature
and the displayed units for slope and zero point can be set resp. adjusted.
In case, that an ISFET sensor has been parameterized, the menu “ISFET” will be displayed and
has to be chosen. (see chapter 8.2.3 “Parameter related settings”)
In the same way as described for pH parameters (see chapter 8.2.3.2 “pH/ORP parameters”)
parameters for ISFET sensors can be modified.
8.2.3.4 Parameters for oxygen measurement
based on amperometric sensors
If during the channel setup (see chapter 8.2.1 “Channel setup”) the parameter O2 hi or O2 lo
has been chosen or an oxygen sensor based on ISM technology is connected to the transmitter,
the parameters calibration pressure, process pressure, ProCalPres, salinity and relative humidity
can be set resp. adjusted. If an ISM sensor is connected, there is furthermore the option to adjust
the parameterization voltage.
For doing this adjustments resp. settings the menu “O2”, that will be displayed, has to be cho-
sen. (see chapter 8.2.3 “Parameter related settings”)
Enter the Calibration pressure in line 3. The default value for CalPres is 759.8 and the default
unit is mmHg.
To enter the process pressure navigate to line 4. The units for process pressure and calibration
pressure do not have to be the same.
Press [ENTER]
For the algorithm of the process calibration the applied pressure (ProcCalPres) has to be de-
fined. The value of the process pressure (ProcPres) or the calibration pressure (CalPres) can be
used. Chose the pressure, that applies during the process calibration, resp. should be used for
the algorithm and press [ENTER]
In the next step the salinity of the measured solution can be modified.
In addition the relative humidity of the calibration gas can also be entered. The allowed values
for relative humidity are in the range 0% to 100%. When no humidity measurement is avail-
able, use 50% (default value).
Press [ENTER]
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