Siemens SITRANS P, Руководство по эксплуатации, Страница: 214 / 280

13.2.8 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)%
Linear characteristic curve r ≤ 5 5 < r ≤ 60
60 mbar/6 kPa/0.87 psi ≤ 0.075% ≤ (0.005 • r + 0.05)%
Linear characteristic curve r ≤ 5 5 < r ≤ 100
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
30 bar/3 MPa/435.11 psi ≤ 0.065% ≤ (0.004 • r + 0.045)%
Root extraction characteris‐
tic
r ≤ 5 5 < r ≤ 20
Flow > 50%
20 mbar/2 kPa/0.29 psi ≤ 0.075% ≤ (0.005 • r + 0.05)%
Root extraction characteris‐
tic
r ≤ 5 5 < r ≤ 60
Flow > 50%
60 mbar/6 kPa/0.87 psi ≤ 0.075% ≤ (0.005 • r + 0.05)%
Root extraction characteris‐
tic
r ≤ 5 5 < r ≤ 100
Flow > 50%
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
30 bar/3 MPa/435.11 psi ≤ 0.065% ≤ (0.004 • r + 0.045)%
Root extraction characteris‐
tic
r ≤ 5 5 < r ≤ 20
Flow 25 ... 50%
20 mbar/2 kPa/0.29 psi ≤ 0.15% ≤ (0.01 • r + 0.1)%
Root extraction characteris‐
tic
r ≤ 5 5 < r ≤ 60
Flow 25 ... 50%
60 mbar/6 kPa/0.87 psi ≤ 0.15% ≤ (0.01 • r + 0.1)%
Root extraction characteris‐
tic
r ≤ 5 5 < r ≤ 100
Technical data
13.2 Measuring accuracy of SITRANS P320
SITRANS P320/P420 with 4 to 20 mA/HART
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Operating Instructions, 11/2019, A5E44852162-AC