Response Time - Emerson Rosemount 8800D Series Reference Manual

Specifications and Reference Data
May 2016
Failure mode alarm
HART analog
If self-diagnostics detect a gross flowmeter failure, the analog signal will be driven to the
values below:
Low
High
NAMUR Low
NAMUR High
High or low alarm signal is user-selectable through the fail mode alarm jumper on the
electronics. NAMUR-compliant alarm limits are available through the C4 or CN Option.
Alarm type is field configurable also.
Saturation output values
When the operating flow is outside the range points, the analog output continues to track
the operating flow until reaching the saturation value listed below; the output does not
exceed the listed saturation value regardless of the operating flow. The NAMUR-Compliant
Saturation Values are available through the C4 or CN option. Saturation type is field
configurable.
Low
High
NAMUR Low
NAMUR High
Damping
Flow Damping adjustable between 0.2 and 255 seconds.
Process Temperature Damping adjustable between 0.4 and 32.0 seconds (MTA Option
Only).

Response time

Three vortex shedding cycles or 300 ms, whichever is greater, maximum required to reach
63.2% of actual input with the minimum damping (0.2 seconds).
Turn-on time
HART analog
Less than six (6) seconds plus the response time to rated accuracy from power up (less than
8 seconds with the MTA Option).
Specifications and Reference Data
3.75 mA
21.75 mA
3.60 mA
22.6 mA
3.9 mA
20.8 mA
3.8 mA
20.5 mA
Reference Manual
00809-0100-4004, Rev DC
103