User's Manual

7ML19985JE03 SITRANS LR250 (HART) – INSTRUCTION MANUAL Page 83
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Parameters
2.5. Fail-safe
2.5.1. Material Level
Defines the mA output to use when the Fail-safe Timer expires.
2.5.2. Timer
Sets the time to elapse since the last valid reading, before the Fail-safe Level is
reported.
2.5.3. Level
Allows the user to define the mA value to be reported when the Fail-safe timer
expires.
Note: Default settings in the parameter tables are indicated with an asterisk (*)
unless explicitly stated.
Note: The default setting depends whether your device is a standard or
NAMUR NE 43-compliant device.
STANDARD DEVICE
Options
HI 20.5 mA (max. mA Limit)
LO 3.8 mA (min. mA Limit)
*HOLDLast valid reading (default 22.6 mA)
VALUE User-selected value [defined in Level (2.5.3.)]
NAMUR NE 43-COMPLIANT DEVICE
Options
HI 20.5 mA (max. mA Limit)
LO 3.8 mA (min. mA Limit)
HOLD Last valid reading
* VALUE
User-selected value [defined in Level (2.5.3.): default
3.58 mA]
Note: When a Loss of Echo occurs Material Level (2.5.1.) determines the
material level to be reported when the Fail-safe timer expires. See Loss of
Echo (LOE) on page 134 for more detail.
Values
Range: 0.00 to 7200 seconds
Default: 100 s
Notes:
• The default setting depends whether your device is a standard or NAMUR
NE 43-compliant device.
• Material Level (2.5.1.) must be set to VALUE to enable the Level value to be
reported.
Device Type
STANDARD
NAMUR NE43-
COMPLIANT
Values
Range 3.56 mA to 22.6 mA
Default 22.60 mA 3.58 mA