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Transmitter M400
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The units for the slope and the zero point, that will be shown on the display can be chosen. The
default setting for the unit of the slope is [%] and can be changed to [pH/mV]. For the zero
point the default setting of the unit is [pH] and can be changed to [mV]. Use the c key to move
to the input field and select the unit by using the  or  key.
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.
8.2.3.4
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 8.2.3.3 “pH/ORP parameters”) parameters for ISFET
sensors can be modified.
8.2.3.5
Parameters for oxygen measurement
based on amperometric sensors
If during the channel setup (see chapter 8.2.1 “Channel setup”) the parameter O2 hi, O2 lo or O2
Trace 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 chosen. (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.
Select Edit in line 4 for entering the applied process pressure manually. Select Ain if an analog
input signal is used for the applied process pressure. Press [ENTER]
h
NOTE: The menu Ain can only be selected if the transmitter is configured for an ISM sensor. 4 to
20 mA input signal has to be wired on TB3. Refer to section 4.3.9 “TB3 – 4 to 20 mA input signal” for wiring of the 4 to 20 mA signal.
If Edit has been chosen an input field for entering the value manually is displayed. In case that
Ain has been selected the start value (4mA) and the end value (20 mA) of the range for the 4 to
20 mA input signal have to be entered.
Press [ENTER]
© 12 / 2013 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland
Printed in Switzerland
Transmitter M400
52 121 378