Differential pressure and flow measuring limits
Lower measuring limit
● Measuring cell
with silicone oil
filling
-100% of maximum measuring range or 30 mbar a /3 kPa a /0.44 psi a
● Measuring cell with inert oil
For process temperature -20 °C
< ϑ ≤ 60 °C (-4 °F < ϑ ≤ +140 °F)
-100% of maximum measuring range or 30 mbar a /3 kPa a /0.44 psi a
For process temperature 60 °C
< ϑ ≤ 100 °C (max. 85 °C for
measuring cell 30 bar with
PN420) (140 °F < ϑ ≤ 212 °F
(max. 185 °F for measuring cell
435 psi))
-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
● Measuring cell
with FDA-
compliant oil
For process temperature -10 °C
< ϑ ≤ 100 °C (-14 °F < ϑ
≤ +212 °F)
-100% of maximum measuring range or 100 mbar a /10 kPa a /
14.5 psi a.
Upper measuring
limit
100% of max. range (for oxygen measurement: max. 100 bar/10 MPa/1450 psi and 60 °C ambient
temperature/medium temperature)
Start of scale value Between the measuring limits (continuously adjustable)
8.1.8 Level
Level input
Measured variable Level
Measuring span (continuous‐
ly adjustable) and maximum
operating pressure (accord‐
ing to 2014/68/EU Pressure
Equipment Directive)
Measuring span Maximum permissible
operating pressure
MAWP (PS)
Max. permissible
test pressure
25 ... 250 mbar
2.5 ... 25 kPa
10 … 100 inH
2
O
See mounting flange
25 ... 600 mbar
2.5 ... 60 kPa
10 … 240 inH
2
O
53 … 1600 mbar
5.3 ... 160 kPa
21 … 640 inH
2
O
166 … 5000 mbar
16.6 ... 500 kPa
2.41 … 72.5 psi
Technical data
8.1 Input
SITRANS P320/P420 with 4 to 20 mA/HART
68 Compact Operating Instructions, 09/2018, A5E38874562-AB
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