Operating functions via HART
7.8 Electrical damping
SITRANS P300 with HART communication
7-18 Operating Instructions, 06/2005, A5E00359579-02
7.8 Electrical damping
Description
You can set the time constant of electrical damping to a point within a range from 0 to 100 s.
It always applies to the "Pressure" device variable (DV0) and thus to the measured values
derived from it.
7.9 Fast response mode
Description
This mode is only intended for special applications such as fast recognition of jumps in
pressure, e.g. pressure drop in the event of pipe breakage. The internal recording of
measured values is sped up at the cost of accuracy. From your point of view, an increased
low-frequency noise is caused for the measured value. For this reason, good accuracy can
only be achieved by setting the measuring span to the maximum.
7.10 Current sensor
Description
The transmitter can be switched to constant current operation for test purposes. In that case,
the current no longer corresponds to the process variable. A "C" appears in the mode display
of the digital display.
7.11 Fault current
Description
You can use this function to set the size of the lower (<4 mA) and upper (>20 mA) fault
current. Both signal a hardware/firmware fault, sensor breakage, or that the alarm limit has
been reached (diagnostic interrupt). In that case, ERROR appears in the digital display. You
can obtain a detailed guide to the display using SIMATIC PDM or the HART Communicator.
Reference
NAMUR recommendation NE43 of Jan 18 1994:
"Standardization of the signal level for the breakdown information of digital transmitters with
analog output signal"
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