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) r = max. measuring span/set measuring span and nominal
measuring range
● Linear characteristic curve
r ≤ 1.25 1.25 < r ≤ 30
250 mbar/25 kPa/3.6 psi ≤ 0.065% ≤ (0.008 • r + 0.055)%
● Linear characteristic curve
r ≤ 5 5 < r ≤ 100
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
≤ 0.04% ≤ (0.004 • r + 0.045)%
● Linear characteristic curve
r ≤ 5 5 < r ≤ 100
400 bar/40 MPa/5802 psi
700 bar/70 MPa/10152 psi
≤ 0.075% ≤ (0.005 • r + 0.05)%
Effect of ambient temperature - gauge pressure
In percent per 28 °C (50 °F)
250 mbar/25 kPa/3.6 psi ≤ (0.16 • r + 0.1)%
1 bar/100 kPa/14.5 psi ≤ (0.05 • r + 0.1)%
Technical data
8.3 Measuring accuracy of SITRANS P420
SITRANS P320/P420 with 4 to 20 mA/HART
Compact Operating Instructions, 09/2018, A5E38874562-AB 79
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