Gauge Pressure From The Differential Pressure Series - Siemens 7MF03 Series Compact Operating Instructions

Technical data
8.3 Measuring accuracy of SITRANS P420
Effect of ambient temperature - gauge pressure
4 bar/400 kPa/58 psi
16 bar/1.6 MPa/232 psi
63 bar/6.3 MPa/914 psi
160 bar/16 MPa/2321 psi
400 bar/40 MPa/5802 psi
700 bar/70 MPa/10152 psi
Long-term stability at ±30 °C (±54 °F) - gauge pressure
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/2321 psi
400 bar/40 MPa/5802 psi
700 bar/70 MPa/10152 psi
Step response time T (without electrical damping) - gauge pressure
63
Approx. 0.105 s
Effect of mounting position - gauge pressure
≤ 0.05 mbar/0.005 kPa/0.000725 psi per 10° incline
(zero-point correction is possible with position error compen‐
sation)
8.3.4

Gauge pressure from the differential pressure series

Conformity error at limit point setting, including hysteresis and repeatability - gauge pressure from differential pressure series
Measuring span ratio r (spread, Turn-Down)
● Linear characteristic curve
● Linear characteristic curve
● Linear characteristic curve
80
20 mbar/2 kPa/8.031 inH
2
60 mbar/6 kPa/24.09 inH
2
≤ (0.025 • r + 0.125)%
≤ (0.08 • r + 0.16)%
Per year ≤ (0.25 • r)%
In 5 years ≤ (0.25 • r)%
In 10 years ≤ (0.35 • r)%
In 5 years ≤ (0.125 • r)%
In 10 years ≤ (0.15 • r)%
In 5 years ≤ (0.25 • r)%
In 10 years ≤ (0.35 • r)%
r = max. measuring span/set measuring span and nomi‐
nal measuring range
r ≤ 5
O ≤ 0.075%
r ≤ 5
O ≤ 0.075%
r ≤ 5
Compact Operating Instructions, 09/2018, A5E38874562-AB
5 < r ≤ 20
≤ (0.005 • r + 0.05)%
5 < r ≤ 60
≤ (0.005 • r + 0.05)%
5 < r ≤ 100
SITRANS P320/P420 with 4 to 20 mA/HART