Local Operation Without A Display Or With Activated Keylock; Set Zero And Full Scale - Siemens 7MF4333 User Manual

On-Line Operation UMSITRPDS3-1

6.3 LOCAL OPERATION WITHOUT A DISPLAY OR WITH ACTIVATED KEYLOCK

When a transmitter is ordered without a display, pushbutton disable mode LS is the default setting.
Limited operation from the magnetic pushbuttons is available. This section describes local operation
when the display is not present or when the magnetic pushbuttons or several modes have been disabled.
Refer to Section 6.2.8 for the pushbutton and function disable options. To cancel magnetic pushbuttons
disable, refer to Section 6.2.1. In most instances, it will be possible to set zero and full scale, as described
in the section below.

6.3.1 Set Zero and Full Scale

The differences between set and adjust were discussed in Section 6.2.2.1. The same conditions and
mathematical relationships apply whether operating with or without a display.
Use the following procedure to set the output current for zero to 4 mA and the full scale to 20 mA.
1. Apply a reference pressure corresponding to zero.
2. Press both arrow pushbuttons simultaneously so that the output is set to 4 mA.
3. Press the M pushbutton to save the setting.
4. Apply a reference pressure corresponding to full scale.
5. Press both arrow pushbuttons simultaneously so the output is set to 20 mA.
6. Press the M pushbutton to save the setting.
If the output current is not set but adjusted continuously, the currents will need to be calculated; refer to
Section 6.2.2.1 as needed. It is possible to make an adjustment for zero, full scale, or for both values.
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November 2010