
Variable application point
The output current for the "srlin" and "sroff" functions can be displayed linearly or set to zero
below the application point of the square root extracting characteristic curve.
Fixed application point
The
"srlin2" function has a permanently defined application point of 10%. The range up to this
point contains two linear characteristic curve sections. The first section ranges from the zero
point to 0.6% of the output value and 0.6% of the pressure value. The second section has a
higher gradient and it goes up to the root application point at 10% of the output value and 1%
of the pressure value.
See also
Flow rate measurement (only differential pressure) (Page 91)
7.21 Diagnostic functions
7.21.1 Overview
Description
HART communication allows you to activate and evaluate a wide range of diagnostic functions
from a central control room or onsite:
● Calibration/service timer
● Min/max indicator
● Limit monitoring modules
● Simulation of measured pressure and temperature values
● Limit monitoring of all device variables
The diagnostics strategy employed for the transmitter incorporates a diagnostic warning and
a diagnostic interrupt for diagnostic functions for monitoring limit values, e.g. for monitoring
current saturation. This warning and interrupt can be configured:
● Diagnostic warning: The device transmits via HART communication the diagnostic event
that has occurred. The current output value is unaffected. The message "Diagnostic
Warning" alternates with the unit on the display.
● Diagnostic interrupt: The device goes into the fault current state. The message "Diagnostic
Warning" or "Diagnostic Alarm" appears on the display, along with the message ERROR.
In addition, the diagnostic event is made available via HART communication.
In the default settings, all warnings and alarms are switched off. You can choose to set either
the diagnostic warning only or the diagnostic interrupt and warning. For HART communication,
use the HART Communicator or PC software such as SIMATIC PDM. To see the steps
Operating functions through HART
7.21 Diagnostic functions
SITRANS P, DS III series with HART
128 Operating Instructions, 09/2012, A5E00047092-08
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