Siemens SITRANS P DS III Operating Instructions Manual page 188

Technical data
11.4 Measuring accuracy
Differential pressure and flow rate measuring accuracy
Reference conditions
Measurement deviation with limit
setting, including hysteresis and
repeatability
Linear characteristic curve
r ≤ 10
•
10 < r ≤ 30
•
30 < r ≤ 100
•
Square root extracting characteristic
curve (flow rate > 50%)
r ≤ 10
•
10 < r ≤ 30
•
square root extracting characteristic
curve (flow rate 25 ... 50%)
r ≤ 10
•
10 < r ≤ 30
•
Settling time T without electrical
63
damping
Long-term drift at ±30 °C (±54 °F)
20 mbar (0.29 psi) measuring cell ≤ (0.2 • r) % per year
•
250, 600, 1600 and 5000 mbar
•
(0.29, 0.87, 2.32 and 7.25 psi)
measuring cell
Effect of the ambient temperature
(double values for measuring cell
20 mbar g (0.29 psi g))
At -10 ... +60°C (14 ... 140°F)
•
188
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
≤ (0.0029 • r + 0.071) %
≤ (0.0045 • r + 0.071) %
≤ (0.005 • r + 0.05) %
≤ 0.1%
≤ 0.2%
≤ 0.2%
≤ 0.4%
Approx. 0.2 s
•
approx 0.3 s for measuring cell 20 and 60 mbar (0.29 and 0.87 psi)
•
≤ (0.25 • r) % per five years
static pressure max. 70 bar g
(1015 psi g)
≤ (0.125 • r) % every 5 years
As percentage
≤ (0.08 • r + 0.1) %
PROFIBUS PA and FOUNDATION
Fieldbus
–
≤ 0.075
–
–
–
≤ 0.1%
–
–
≤ 0.2%
–
–
≤ 0.25 % per five years
static pressure max. 70 bar g
(1015 psi g)
≤ 0.2 % per year
≤ 0.125% every 5 years
≤ 0.3%
SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09