8.3.7 Gauge pressure with front-flush diaphragm
Conformity error at limit point setting, including hysteresis and repeatability - gauge pressure with front-flush diaphragm
Measuring span ratio r (spread, Turn-Down) r = max. measuring span/set measuring span and nominal
measuring range
● 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
≤ 0.075% ≤ (0.005 • r + 0.05)%
Effect of ambient temperature - gauge pressure with front-flush diaphragm
In percent per 28 °C (50 °F)
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
≤ (0.08 • r + 0.16)%
Long-term stability at ±30 °C (±54 °F) - gauge pressure with front-flush diaphragm
1 bar/100 kPa/14.5 psi
4 bar/400 kPa/58 psi
In 5 years ≤ (0.25 • r)%
16 bar/1.6 MPa/232 psi
63 bar/6.3 MPa/914 psi
In 5 years ≤ (0.125 • r)%
Step response time T
63
(without electrical damping) - gauge pressure with front-flush diaphragm
Approx. 0.105 s
Effect of mounting position - gauge pressure with front-flush diaphragm
≤ 0.4 mbar/0.04 kPa/0.006 psi per 10° incline
(zero-point correction is possible with position error compen‐
sation)
8.3.8 Differential pressure and flow
Conformity error at limit point setting, including hysteresis and repeatability - differential pressure and flow
Measuring span ratio r (spread, Turn-Down) r = max. measuring span/set measuring span and nomi‐
nal measuring range
Linear characteristic curve r ≤ 5 5 < r ≤ 20
20 mbar/2 kPa/0.29 psi ≤ 0.075% ≤ (0.005 • r + 0.05)%
Technical data
8.3 Measuring accuracy of SITRANS P420
SITRANS P320/P420 with 4 to 20 mA/HART
84 Compact Operating Instructions, 09/2018, A5E38874562-AB
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