Effect of mounting position - absolute pressure from gauge and differential pressure series
In pressure per change of angle
● For absolute pressure (from the gauge pressure series):
≤ 0.05 mbar/0.005 kPa/0.000725 psi per 10° incline
● For absolute pressure (from the differential pressure
series): 0.7 mbar/0.07 kPa/0.001015 psi per 10° incline
(zero-point correction is possible with position error compen‐
sation)
8.3.6 Absolute pressure with front-flush diaphragm
Conformity error at limit point setting, including hysteresis and repeatability
Measuring span ratio r (spread, Turn-Down) r = max. measuring span/set measuring span and nominal
measuring range
Linear characteristic curve r ≤ 10 10 < r ≤ 30
All measuring cells ≤ 0.2% ≤ 0.4%
Effect of ambient temperature
In percent per 28 °C (50 °F)
All measuring cells ≤ (0.16 • r + 0.24)
Long-term stability at ±30 °C (±54 °F)
All measuring cells In 5 years ≤ (0.25 • r)%
Step response time T
63
(without electrical damping)
Approx. 0.105 s
Effect of mounting position
In pressure per change of angle
0.04 kPa/0.4 mbar/0.006 psi per 10° incline
(zero-point correction is possible with position error compen‐
sation)
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 83
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