Measuring Accuracy Of Sitrans P420; Reference Conditions; Effect Of Auxiliary Power Supply; Gauge Pressure - Siemens 7MF03 Series Compact Operating Instructions

8.3

Measuring accuracy of SITRANS P420

8.3.1

Reference conditions

● According to EN 60770-1/IEC 61298-1
● Rising characteristic curve
● Lower range value 0 bar/kPa/psi
● Seal diaphragm stainless steel
● Measuring cell with silicone oil filling
● Room temperature 25 °C (77 °F)
8.3.2

Effect of auxiliary power supply

0.005% per 1 V (in percent per change in voltage)
8.3.3

Gauge pressure

Conformity error at limit point setting, including hysteresis and repeatability - gauge pressure
Measuring span ratio r (spread, Turn-Down)
● Linear characteristic curve
● Linear characteristic curve
● Linear characteristic curve
Effect of ambient temperature - gauge pressure
In percent per 28 °C (50 °F)
250 mbar/25 kPa/3.6 psi
1 bar/100 kPa/14.5 psi
SITRANS P320/P420 with 4 to 20 mA/HART
Compact Operating Instructions, 09/2018, A5E38874562-AB
250 mbar/25 kPa/3.6 psi
1 bar/100 kPa/14.5 psi
4 bar/400 kPa/58 psi
16 bar/1.6 MPa/232 psi
63 bar/6.3 MPa/914 psi
160 bar/16 MPa/12321 psi
400 bar/40 MPa/5802 psi
700 bar/70 MPa/10152 psi
8.3 Measuring accuracy of SITRANS P420
r = max. measuring span/set measuring span and nominal
measuring range
r ≤ 1.25
≤ 0.065%
r ≤ 5
≤ 0.04%
r ≤ 5
≤ 0.075%
≤ (0.16 • r + 0.1)%
≤ (0.05 • r + 0.1)%
Technical data
1.25 < r ≤ 30
≤ (0.008 • r + 0.055)%
5 < r ≤ 100
≤ (0.004 • r + 0.045)%
5 < r ≤ 100
≤ (0.005 • r + 0.05)%
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