Siemens SITRANS P DS III - Page 201

Technical data
13.4 Measuring accuracy
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
201
Gauge pressure measuring accuracy, with flush mounted diaphragm
HART
PROFIBUS PA and FOUNDATION
Fieldbus
Reference conditions
• Rising characteristic curve
• Start of scale value 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
≤ 0.075%
• r ≤ 10
≤ (0.0029 • r + 0.071) % –
• 10 < r ≤ 30
≤ (0.0045 • r + 0.071) % –
• 30 < r ≤ 100
≤ (0.005 • r + 0.05) % –
Settling time T
63
without electrical
damping
Approx. 0.2 s
Long-term drift at ±30 °C (±54 °F) In 5 years
≤ (0.25 • r) %
In 5 years
≤ 0.25%
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 process temperature
In pressure per temperature change
• Temperature difference between
process temperature and ambient
temperature
3 mbar per 10 K (0.04 psi per 10 K)
Effect of mounting position In pressure per change in angle
0.4 mbar (0.006 psi) per 10° inclination
Correction via zero offset
Effect of auxiliary power supply In percent per change in voltage
0.005 % per 1 V
–
Measuring value resolution
–
3 • 10
-5
of the rated measuring range