Emerson Rosemount 2140 Reference Manual page 103

Reference Manual
00809-0100-4140
Maximum deviation frequency
The change in sensor frequency occurring during the maximum deviation duration that
will cause an alert to be generated.
Maximum Deviation Duration
The period of time during which a change in the sensor frequency greater than the
maximum deviation will cause an alert to be generated.
Applications for minimum deviation function
The minimum frequency deviation is designed for use in applications such as:
• The circuit is working properly with a faulty fork sensor, in which the circuit might
generate a very stable frequency output within the tolerances of a minimum deviation
in the minimum deviation duration.
• The circuit might be locked in a self-resonant frequency unexpectedly where the
frequency output might be very stable as well.
Applications for the maximum deviation function
The maximum frequency deviation is designed for use in applications such as:
• The fork sensor or its wires might be half-broken, or in an intermittent working
condition, where the vibration frequency might be jumping up and down.
• An alert is to be generated if the process level has been raised or fallen too rapidly,
perhaps due to large ripples on the surface or leakage in a vessel (tank).
B.1.9 Device information
Tag
Identifier of up to 8 characters for the device used by host system. The tag is typically a
reference number, location, or duty description.
Long tag
Identifier of up to 32 characters for the device used by host system. It is recommended to
enter both a short and a long tag (they may be the same).
Date
The date field can be used for any purpose, for example to save the date of the last
configuration change.
Descriptor
The 16-character descriptor field can be used for any purpose.
Message
The 32-character message field can be used for any purpose, such as providing details of
the last configuration change.
Rosemount 2140 and 2140:SIS Level Detectors
Configuration parameters
March 2022
103