Level - Siemens SITRANS P Operating Instructions Manual

For devices with functional safety, the minimum permissible measuring span is limited by the
1)
spread. Therefore, ensure that the configured spread is no higher than 5:1.
Differential pressure and flow measuring limits
Lower measuring limit
-100% of maximum measuring range or 30 mbar a /3 kPa a /0.44 psi a
● Measuring cell
with silicone oil
filling
● Measuring cell with inert oil
For process temperature -20 °C
< ϑ ≤ 60 °C (-4 °F < ϑ ≤ +140 °F)
For process temperature 60 °C
< ϑ ≤ 100 °C (max. 85 °C for
measuring cell 30 bar with
PN 420) (140 °F < ϑ ≤ 212 °F
(max. 185 °F for measuring cell
435 psi))
For process temperature -10 °C
● Measuring cell
< ϑ ≤ 100 °C (-14 °F < ϑ
with FDA-
≤ +212 °F)
compliant oil
Upper measuring 100% of max. range (for oxygen measurement: max. 100 bar/10 MPa/1450 psi and 60 °C ambient
limit temperature/medium temperature)
Lower range value Between the measuring limits (continuously adjustable)
13.1.8

Level

Level input
Measured variable
Measuring span (continuous‐
ly adjustable) and maximum
operating pressure (accord‐
ing to 2014/68/EU Pressure
Equipment Directive)
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC
-100% of maximum measuring range or 30 mbar a /3 kPa a /0.44 psi a
-100% of maximum measuring range or 30 mbar a /3 kPa a /0.44 psi a
30 mbar a + 20 mbar a • (ϑ - 60 °C)/°C
3 kPa a + 2 kPa a • (ϑ - 60 °C)/°C
0.44 psi a + 0.29 psi a • (ϑ - 140 °F)/°F
-100% of maximum measuring range or 100 mbar a /10 kPa a /
14.5 psi a.
Level
Measuring span
1)
25 ... 250 mbar
2.5 ... 25 kPa
10 ... 100 inH O
2
25 ... 600 mbar
2.5 ... 60 kPa
10 ... 240 inH O
2
53 ... 1600 mbar
5.3 ... 160 kPa
21 ... 640 inH O
2
166 ... 5000 mbar
16.6 ... 500 kPa
2.41 ... 72.5 psi
Maximum permissible
operating pressure
MAWP (PS)
See mounting flange
Technical data
13.1 Input
Max. permissible
test pressure
207