Siemens SITRANS P500, Operating Instructions Manual, Page: 201 / 238

Technical data
11.4 Measuring accuracy
SITRANS P500 with HART
Operating Instructions, 12/2014, A5E02344528-09
201
11.4 Measuring accuracy
Differential pressure and flow rate measuring accuracy
Reference conditions
according to IEC 60770-1
• Rising characteristic curve
•
Start of scale value 0 kPa/bar/psi
• Seal diaphragm stainless steel
•
Measuring cell with silicone oil filling
• Room temperature 25°C (77°F)
•
Vertical installation of the device
Measuring span ratio r (spread, Turn-Down) r = maximum measuring span/set measuring span
Total Performance
• Linear characteristic
r ≤ 5 5 < r ≤ 10
5 kPa/50 mbar/20 inH
2
O ≤ 0,27 % ≤ 0,46 %
25 kPa/250 mbar/100 inH
2
O ≤ 0,14 % ≤ 0,27 %
25 kPa/1250 mbar/502 inH
2
O
625 kPa/6250 mbar/2509 inH
2
O
3200 kPa/32 bar/465 psi
≤ 0,09 % ≤ 0,14 %
• Root extraction characteristic
Flow > 50 % r ≤ 5 5 < r ≤ 10
• 5 kPa/50 mbar/20 inH
2
O
≤ 0,27 % ≤ 0,46 %
•
25 kPa/250 mbar/100 inH
2
O
≤ 0,14 % ≤ 0,27 %
• 25 kPa/1250 mbar/502 inH
2
O
625 kPa/6250 mbar/2509 inH
2
O
3200 kPa/32 bar/465 psi
≤ 0,09 % ≤ 0,14 %
Flow 25 ... 50 % r ≤ 5 5 < r ≤ 10
• 5 kPa/50 mbar/20 inH
2
O
≤ 0,54 % ≤ 0,92 %
•
25 kPa/250 mbar/100 inH
2
O
≤ 0,28 % ≤ 0,54 %
• 25 kPa/1250 mbar/502 inH
2
O
625 kPa/6250 mbar/2509 inH
2
O
3200 kPa/32 bar/465 psi
≤ 0,18 % ≤ 0,28 %
Conformity error at limit point setting, including
hysteresis and repeatability
•
Linear characteristic
r ≤ 10 r ≥ 10
5 kPa/50 mbar/20 inH
2
O ≤ 0,06 % ≤ (0.006 • r) %
25 kPa/250 mbar/100 inH
2
O
1.25 bar/1250 mbar/502 inH
2
O
625 kPa/6250 mbar/2509 inH
2
O
3200 kPa/32 bar/465 psi
≤ 0,03 % ≤ (0.003 • r) %
• Root extraction characteristic
Flow > 50 % r ≤ 10 r ≥ 10