Page 66 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL 7ML19985JF02
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Parameters
To set Auto False Echo Suppression via the handheld programmer:
c. Go to Auto Suppression Range (2.2.4.3.) and enter the value
calculated in step b).
d) Go to Auto False Echo Suppression (2.2.4.2.) and press RIGHT
ARROW to open Edit Mode
e) Select Learn. The device will automatically revert to On (Use
Learned TVT) after a few seconds.
2.2.4.3. Auto Suppression Range
Defines the endpoint of the Learned TVT distance. Units are defined in
sensor units.
a) Press RIGHT ARROW to open Edit mode.
b) Enter the new value and press RIGHT ARROW to accept it.
c) Set Auto False Echo Suppression (2.2.4.2.)
2.2.4.4. Shaper Mode
Enables/disables TVT shaper (2.2.5.).
2.2.5. TVT shaper
A breakpoint on the TVT curve. This allows you to reshape the TVT curve to
avoid unwanted echoes. There are 40 breakpoints arranged in 5 groups. (We
recommend using SIMATIC PDM to access this feature.)
To use TVT shaper via LUI (local user interface):
a) Go to Shaper Mode (2.2.4.4.) and select option ON.
b) In TVT shaper, go to Shaper 1-9 (2.2.5.1.).
c) Open Shaper 1 and enter the TVT Offset value (between –50 and 50).
d) Go to the next Shaper point and repeat step (c) till all desired breakpoint
values have been entered.
2.2.5.1. Shaper 1-9
Options
OFF Default TVT will be used.
* ON ’Learned’ TVT will be used.
LEARN ’Learn’ the TVT.
Values
Range: 0.00 to 20.00 m
Default: 1.0 0 m
Options
OFF*, ON
Note: The range is –100 to 100 bits. With 2 bits per dB this gives a range of –
50 to 50 dB.
Values
Range: – 50 to 50 dB
Default: 0 dB
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