Siemens SITRANS LUT400, Руководство по эксплуатации

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Page 146 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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2.5.3. 4 mA Setpoint
Sets the process level corresponding to the 4 mA value. 4 mA always defaults
to 0 m , and Current Output Function (2.5.1.) determines the type of
measurement. [See Current Output Function (2.5.1.) for an illustration.]
• Enter the reading that is to correspond to a 4 mA output.
• Units are defined in Units (2.1.1.) for Level, Space, Distance, or Head, and in
Flowrate Units (2.15.3.7.) for Flow. Volume units are converted from a level
value.
2.5.4. 20 mA Setpoint
Sets the process level corresponding to the 20 mA value. 20 mA always defaults
to 60 m, and Current Output Function (2.5.1.) determines the type of
measurement. [See Current Output Function (2.5.1.) for an illustration.]
• Enter the reading that is to correspond to a 20 mA output.
• Units are defined in Units (2.1.1.) for Level, Space, or Distance, or Head, and
in Flowrate Units (2.15.3.7.) for Flow. Volume units are converted from a
level value.
2.5.5. Minimum mA Limit
Prevents the mA output from dropping below this minimum level for a
measurement value. This does not restrict the Fail-safe or Manual settings.
2.5.6. Maximum mA Limit
Prevents the mA output from rising above this maximum level for a
measurement value. This does not restrict the Fail-safe or Manual settings
Values
Range:
Level, Space, Distance, Head: 0.000 to 60.000 m
Volume: 0.0 to Max. Volume
Flow: 0 to Max. Flow
Default: 0
(set to value corresponding to 0% as defined by Current Output
Function and associated units)
Values
Range:
Level, Space, Distance, Head: 0.000 to 60.000 m
Volume: 0.0 to Max. Volume
Flow: 0 to Max. Flow
Default:
Level, Space, Distance, Head: 60.000
Volume: Max. Volume
Flow: Max Flow
(set to value corresponding to 100% as defined by Current Out-
put Function and associated units)
Values
Range:
3.5 to 22.8 mA
Default: 4.0
Values
Range:
3.5 to 22.8 mA
Default: 20.0