Siemens SITRANS P DS III Operating Instructions Manual page 189

Differential pressure and flow rate measuring accuracy
At -40 ... -10°C and
•
+60 ... +85°C
(-40 ... 14°F and 140 ... 185°F)
Effect of static pressure
At the start of scale value
•
Measuring cell 20 mbar
(0.29 psi)
On the measuring span
•
Measuring cell 20 mbar
(0.29 psi)
Effect of mounting position
Effect of auxiliary power supply
Measured value resolution
Level measuring accuracy
Reference conditions
Measurement deviation with limit
setting, including hysteresis and
repeatability
Linear characteristic curve
r ≤ 10
•
10 < r ≤ 30
•
30 < r ≤ 100
•
Settling time T without electrical
63
damping
SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09
HART
≤ (0.1 • r + 0.15) % per 10 K
≤ (0.1 • r) % per 70 bar (1015 psi)
≤ (0.15 • r) % per 32 bar (464 psi)
≤ 0.15 % per 70 bar (1015 psi)
≤ 0.2 % per 32 bar (464 psi)
In pressure per change of angle
≤ 0.7 mbar (0.001015 psi) per 10° inclination
Correction via zero offset
In percent per change in voltage
0.005 % per 1 V
–
HART
Rising characteristic curve
•
Start of scale 0 bar
•
Seal diaphragm stainless steel
•
Measuring cell with silicone oil filling
•
Room temperature 25 °C (77 °F)
•
Measuring span ratio r
•
r = max. measuring span/set
measuring span
≤ 0.15%
≤ 0.3%
≤ (0.0075 • r + 0.075) %
Approx. 0.2 s
11.4 Measuring accuracy
PROFIBUS PA and FOUNDATION
Fieldbus
≤ 0.25 % per 10 K
≤ 0.1% per 70 bar (1015 psi)
≤ 0.15 % per 32 bar (464 psi)
-
-
–
3 • 10 of the rated measuring range
-5
PROFIBUS PA and FOUNDATION
Fieldbus
–
≤ 0.075
–
–
–
Technical data
189