KROHNE OPTIFLEX 2200 C_F EN - Manual (Page 87)

OPERATION
6
87
OPTIFLEX 2200 C/F
www.krohne.com 07/2013 - 4000668002 - HB OPTIFLEX 2200 R02 en
How to delete a volume or mass table.
• Enter the supervisor menu.
• Push 7 × [
], [>>>>], and [ ] to go to 2.8.2 DELETE TABLE.
• Push [>>>>] and [ ] to set the parameter to YES YES YES YES.
• Push [^ ^ ^ ^] to go back to the "STORE" screen.
• Push [ ] or [ ] to set the screen to STORE YES STORE YES STORE YES STORE YES and push [^ ^ ^ ^].
i The device will delete the data for the strapping table and go back to normal mode. The
"CONVERSION" and "ULLAGE CONV." data are not available in normal mode.
6.4.8 Thresholds and parasitic signals
General notes
The low-power electromagnetic signal from the device goes down the probe. The surface of the
liquid or solids, and objects in the tank, make reflections. These reflections go back up the probe
to the signal converter. The signal converter changes the reflections into voltage amplitudes.
Reflections from objects in the tanks are interference signals (parasitic signals).
How thresholds work
Thresholds let the device ignore reflections with small amplitudes and monitor changes in level.
The device uses the menu items that follow:
• Direct mode only: Direct mode only: Direct mode only: Direct mode only: 2.5.7 MEAS. THRESH. (measurement threshold) to set the threshold for the
reflection on the surface of the liquid or solids.
• TBF mode only: TBF mode only: TBF mode only: TBF mode only: 2.5.9 PROBE END TH. (probe end threshold) to set the threshold for the
reflection on the end of the probe. If the device operates in TBF mode or must calculate the ε
r
of the product, there must be a good probe end signal.
The user can do a check of the signal amplitude after reflection on the surface of the
liquid or solids:
• 2.5.6 MEAS. AMP. (measured pulse amplitude). This is the signal amplitude (after reflection
on the liquid or solids in the tank) compared with the reference pulse amplitude. It is
measured in thousandths (1...1000) of the reference pulse amplitude (value= 1000). The
device measures the distance from the process connection to the level signal, and the signal
amplitude. The signal converter then does a mathematical conversion (that agrees with a law
of signal attenuation) to show the signal amplitude at a standard distance of 1 m / 3.3 ft from
the process connection. This value helps you to set the measurement threshold in menu item
2.5.7 MEAS. THRESH.
• 2.5.8 PROBE END AMP (probe end amplitude). This is the signal amplitude (after reflection on
the probe end) compared with the reference pulse amplitude. This value is measured in
thousandths (1...1000) of the reference pulse amplitude (value= 1000). The device measures
the distance from the process connection to the level signal, and the signal amplitude. The
signal converter then does a mathematical conversion (that agrees with a law of signal
attenuation) to show the signal amplitude at a standard distance of 1 m / 3.3 ft from the
process connection. This value helps you to set the measurement threshold in menu item
2.5.9 PROBE END TH.
INFORMATION!
For more data on menu items, refer to Function description on page 74
.