1)
For
devices with functional safety, the minimum permissible measuring span is limited by the
spread. Therefore, ensure that the configured spread is no higher than 5:1.
Level measuring limits
Lower measuring limit
Measuring cell with silicone oil
filling
-100% of max. measuring range or 30 mbar a/3 kPa a/0.44 psi a depending
on the mounting flange
Measuring cell with inert oil -100% of max. measuring range or 30 mbar a/3 kPa a/0.44 psi a depending
on the mounting flange
Measuring cell with FDA-com‐
pliant oil
-100% of maximum measuring range or 100 mbar a /10 kPa a /1.45 psi a
Upper measuring limit 100% of max. range
Lower range value Between the measuring limits (continuously adjustable)
13.2 Measuring accuracy of SITRANS P320
13.2.1 Reference conditions
● According to EN 60770-1/IEC 61298-1
● Rising characteristic curve
● Lower range value 0 bar/kPa/psi
● Seal diaphragm stainless steel
● Measuring cell with silicone oil filling
● Room temperature 25 °C (77 °F)
13.2.2 Effect of auxiliary power supply
0.005% per 1 V (in percent per change in voltage)
13.2.3 Gauge pressure
Conformity error at limit point setting, including hysteresis and repeatability - gauge pressure
Measuring span ratio r (spread, Turn-Down) r = max. measuring span/set measuring span and nominal
measuring range
● Linear characteristic curve
r ≤ 1.25 1.25 < r ≤ 30
250 mbar/25 kPa/3.6 psi ≤ 0.075% ≤ (0.008 • r + 0.055)%
● Linear characteristic curve
r ≤ 5 5 < r ≤ 100
Technical data
13.2 Measuring accuracy of SITRANS P320
SITRANS P320/P420 with 4 to 20 mA/HART
208 Operating Instructions, 11/2019, A5E44852162-AC
To Next Page
Loading...
