13.3.9
Level
Conformity error at limit point setting, including hysteresis and repeatability - level
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 ≤ 10
250 mbar/25 kPa/3.63 psi
600 mbar/60 kPa/8.70 psi
1600 mbar/160 kPa/23.21 psi
5 bar/500 kPa/72.52 psi
≤ 0.04%
≤ (0.004 • r + 0.045)%
Effect of ambient temperature
1)
- level
In percent per 28 °C (50 °F)
250 mbar/25 kPa/3.63 psi
5 bar/500 kPa/72.52 psi
≤ (0.025 • r + 0.0625)%
600 mbar/60 kPa/8.70 psi
1600 mbar/160 kPa/23.21 psi
≤ (0.125 • r + 0.0625)%
1)
Data only applies to the basic unit. The error of the remote seal must be considered additively.
Effect of static pressure - level
● On the lower range value
50 mbar/25 kPa/3.63 psi
600 mbar/60 kPa/8.70 psi
600 mbar/160 kPa/23.21 psi
≤ (0.1 • r)% per 70 bar (zero-point correction is possible with position error
compensation)
5 bar/500 kPa/72.52 psi
≤ (0.15 • r)% per 70 bar (zero-point correction is possible with position error
compensation)
● On the measuring span
≤ (0.1 • r)% per 70 bar
Long-term stability at ±30 °C (±54 °F) - level
All measuring cells
In 5 years ≤ (0.25 • r)% static pressure max. 70 bar/7 MPa/
1015 psi
Effect of mounting position - level
Depends on the fill fluid in the
mounting flange
Technical data
13.3 Measuring accuracy of SITRANS P420
SITRANS P320/P420 (mA/HART)
218
Operating Instructions, 06/2018, A5E44852162-AA