65
Reference Manual
00809-0100-4840, Rev CB
Section 5: Service and Troubleshooting
February 2015
Service and Troubleshooting
5.5.4 Setting the dead band (on the 3102/3105)
Screen display: dEAd
Default value: 0.3 (m)
The dead band is a region below the transmitter face in where no measurements can be made.
This is also known as the Blanking or Blocking zone, and is a feature common to all ultrasonic
level transmitters, with a value dependent upon certain intrinsic properties of the transmitter.
The dead band should not be lower than the factory default minimum value unless advised by
the manufacturer. A higher value may be entered to stop the processing of echoes from false
targets, but real echoes in the dead band will also now be ignored.
Note
This menu option is in the engineering menu “Eng”. See “Accessing the engineering menu (on
the 3102/3105)” on page 62 or see Figure C-5 on page 106 for a map of the menu structure.
To change the dead band:
1. After entering the “Eng” menu (see the note above), press the green button
repeatedly until “dEAd” is indicated.
2. Press the blue button
to enter the dead band menu. The display indicates the present
dead band value.
3. If this dead band is correct, press the red button
and then press the green button to
get to the next menu option. Otherwise, continue with step (4).
4. Press the blue button
to start the editing mode. The first digit flashes to indicate it
can now be edited.
5. Press the green button
repeatedly to edit the flashing digit.
6. Press the blue button
to move to the next digit. The digit flashes to indicate it can be
edited.
7. Repeat steps (5) and (6) until the last digit is flashing, and edited as required.
8. Press the blue button
to confirm the new value. (The flashing stops).
9. Press the red button
to save the new value if it is correct, or press the blue button to
not save. Afterwards, depending on the button pressed, either the “dEAd” menu or the
next menu appears.
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