Measuring Accuracy Of Sitrans P320; Reference Conditions; Effect Of Auxiliary Power Supply; Gauge Pressure - Siemens 7MF03 Series Compact Operating Instructions

Level measuring limits
Lower measuring limit
Measuring cell with silicone oil
filling
Measuring cell with inert oil
Measuring cell with FDA-com‐
pliant oil
Upper measuring limit
Lower range value
8.2

Measuring accuracy of SITRANS P320

8.2.1

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)
8.2.2

Effect of auxiliary power supply

0.005% per 1 V (in percent per change in voltage)
8.2.3

Gauge pressure

Conformity error at limit point setting, including hysteresis and repeatability - gauge pressure
Measuring span ratio r (spread, Turn-Down)
● Linear characteristic curve
● Linear characteristic curve
SITRANS P320/P420 with 4 to 20 mA/HART
Compact Operating Instructions, 09/2018, A5E38874562-AB
-100% of max. measuring range or 30 mbar a/3 kPa a/0.44 psi a depending
on the mounting flange
-100% of max. measuring range or 30 mbar a/3 kPa a/0.44 psi a depending
on the mounting flange
-100% of maximum measuring range or 100 mbar a /10 kPa a /1.45 psi a
100% of max. range
Between the measuring limits (continuously adjustable)
250 mbar/25 kPa/3.6 psi
8.2 Measuring accuracy of SITRANS P320
r = max. measuring span/set measuring span and nominal
measuring range
r ≤ 1.25
≤ 0.075%
r ≤ 5
Technical data
1.25 < r ≤ 30
≤ (0.008 • r + 0.055)%
5 < r ≤ 100
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