Siemens SITRANS P DS III - Page 203

Technical data
13.4 Measuring accuracy
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
203
Absolute pressure measuring accuracy (from gauge and differential pressure series)
HART
PROFIBUS PA and FOUNDATION
Fieldbus
Reference conditions
• 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
–
Measurement deviation with limit
setting, including hysteresis and
repeatability
Linear characteristic curve
≤ 0.1%
• r ≤ 10
≤ 0.1% –
• 10 < r ≤ 30
≤ 0.2% –
Settling time T
63
without electrical
damping
Approx. 0.2 s
Long-term drift at ±30 °C (±54 °F)
per year ≤ (0.1 • r) %
per year ≤ 0.1 %
Effect of ambient temperature
in percent
• At -10 … +60 °C (14 … 140 °F)
≤ (0.1 • r + 0.2) % ≤ 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 mounting position In pressure per change of angle
• for absolute pressure (from the gauge pressure series): 0.05 mbar
(0.000725 psi) per 10° inclination
• for absolute pressure (from the differential pressure series): 0.7 mbar
(0.001015 psi) per 10° inclination
Correction via zero offset
Effect of auxiliary power supply In percent per change in voltage
0.005 % per 1 V
–
Measured-value resolution
–
3 • 10
-5
of the rated measuring range