Siemens SITRANS LUT400, Operating Instructions Manual, Page: 456 / 601

A5E33329501 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS Page 143
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2.3.2. Empty Rate per Minute
Defines the maximum rate at which the reported level is allowed to decrease.
Adjusts the SITRANS LUT400 response to decreases in the actual material
level.
Enter a value slightly greater than the vessel’s maximum emptying rate, in units
per minute.
2.3.3. Damping Filter
Use this to stabilize the reported level (displayed and analog output), due to lev-
el fluctuations (such as a rippling or splashing liquid surface), defined in sec-
onds.
2.4. Fail-Safe
The fail-safe parameters ensure that the devices controlled by the SITRANS LUT400
default to an appropriate state when a valid level reading is not available. The PV
region on LUI will display dashes (– – – – – – –) until the fail-safe fault has been
cleared. (See General Fault Codes on page 233 for a list of faults that will cause fail-
safe.)
2.4.1. Material Level
Defines the mA output to use (shown in Current Output Value) when the Fail-
safe Timer expires and the device is still in an error condition.
Values
Range:
0.000 to 99999.000
m/min
Default: 0.100 m/min
Values
Range: 0.0 to 7200.0
Default: 100.0
Note: When a Loss of Echo occurs Material Level (2.4.1.) determines the material
level to be reported when the Fail-safe timer expires. See Loss of Echo (LOE) on
page 263 for more detail.
Note: The default is a factory setting and depends whether or not your device
was ordered as NAMUR NE43-compliant for Fail-safe.
Options
HI 20.0 mA (max. mA Limit)
LO 4.0 mA (min. mA Limit)
HOLD Last valid reading
VALUE
User-selected value [defined in Fail-Safe mA Value (2.4.3.):
default 3.58 mA]
Default VALUE (if ordered with NAMUR NE43 compliant fail-safe preset)
HOLD (if ordered without NAMUR NE43 compliant fail-safe preset)