
11.3 Output
Output
HART PROFIBUS PA or Foundation Fieldbus
Output signal 4 … 20 mA Digital PROFIBUS-PA or
Foundation Fieldbus signal
● Lower limit (continuously
adjustable)
3.55 mA, set to 3.84 mA in the factory –
● Upper limit (continuously
adjustable)
23 mA, set to 20.5 mA or optionally
22.0 mA in the factory
–
● Ripple (without HART
communication)
I
SS
≤ 0.5 % of the max. output current –
adjustable time constants
damping coefficient
0 … 100 s, continuously adjustable 0 … 100 s, continuously adjustable
Adjustable time constants (T63)
with local operation
0 … 100 s, in steps of 0.1 s
Factory-set to 2 s
0 … 100 s, in steps of 0.1 s
Factory-set to 2 s
● Current transmitter 3.55 … 23 mA –
● Failure signal 3.55 … 23 mA –
Load Resistor R [Ω] –
● Without HART communication
–
U
H
Power supply in V
● With HART communication –
HART communicator (Handheld) R =230 … 1100 Ω –
SIMATIC PDM R =230 … 500 Ω –
Characteristic curve ● Linearly increasing or linearly decreasing
●
Linear increase or decrease or square root extracting increasing (only for
DS III differential pressure and flow rate)
Bus physics – IEC 61158-2
Polarity-independent – Yes
11.4 Measuring accuracy
Measuring accuracy (as per EN 60770-1) gauge pressure
HART PROFIBUS PA or Foundation Fieldbus
Reference conditions ● Rising characteristic curve
●
Start of scale value 0 bar
● Seal diaphragm: stainless steel
● Measuring cell with silicon oil filling
● Room temperature 25°C (77°F)
● Measuring span ratio r
r = maximum measuring span or set
measuring span
–
Technical data
11.4 Measuring accuracy
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 177
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