Siemens SITRANS P Betriebsanleitung Seite 184

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Differential pressure and flow rate measuring accuracy
HART PROFIBUS PA or Foundation Fieldbus
Effect of the ambient temperature
(double values for measuring cell
20 mbar g (0.29 psi g))
As percentage
At -10 … +60°C (14 … 140°F) ≤ (0.08 • r + 0.1) % ≤ 0,3 %
At -40 … -10°C and
+60 … +85°C
(-40 … 14°F and 140 … 185°F)
≤ (0.1 • r + 0.15) % per 10 K ≤ 0.25 % per 10 K
Effect of static pressure
At the start of scale value ≤ (0.1 • r) % per 70 bar (1015 psi) ≤ 0.1% per 70 bar (1015 psi)
Measuring cell 20 mbar (0.29 psi) ≤ (0.15 • r) % per 32 bar (464 psi) ≤ 0.15 % per 32 bar (464 psi)
On the measuring span ≤ 0.15 % per 70 bar (1015 psi) -
Measuring cell 20 mbar (0.29 psi) ≤ 0.2 % per 32 bar (464 psi) -
Influence of mounting position In pressure per change of angle
≤ 0.7 mbar (0.001015 psi) per 10° inclination
Correction via zero offset
Power supply influence In percent per change in voltage
0.005 % per 1 V
Measured value resolution 3 • 10
-5
of the rated measuring range
Level measuring accuracy
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
Measurement deviation with limit
setting, including hysteresis and
repeatability.
Linear characteristic curve ≤ 0,075
r ≤ 10 ≤ 0,15 %
10 < r ≤ 30 ≤ 0,3 %
30 < r ≤ 100 ≤ (0.0075 • r + 0.075) %
Settling time T
63
without electrical
damping
approx. 0.2 s
Long-term drift at ±30°C (±54°F) ≤ (0.25 • r) % per five years
static
pressure max. 70 bar g (1015 psi g)
≤ 0.25 % per five years
static pressure max. 70 bar g (1015 psi g)
Ambient temperature influence As percentage
At
-10 +60°C (14 140°F) (0.4
instead of 0.2 at 10 < r ≤ 30)
Technical data
11.4 Measuring accuracy
SITRANS P, DS III series with HART
182 Operating Instructions, 09/2012, A5E00047092-08
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