Gauge pressure measuring limits
● Measuring cell with inert oil
30 mbar a/3 kPa a/0.44 psi a
● Measuring cell with FDA-compliant oil
100 mbar a/10 kPa a/1.45 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)
1)
For 250 mbar/25 kPa/3.6 psi measuring cells, the low measuring limit is 750 mbar a/75 kPa a/
10.8 psi a. The measuring cell is vacuum-tight down to 30 mbar a/3 kPa a/0.44 psi a.
8.1.2 Gauge pressure with front-flush diaphragm
Gauge pressure input with front-flush diaphragm
Measured variable Gauge pressure
Measuring span (continuous‐
ly adjustable) or measuring
range, max. operating pres‐
sure and max. test pressure
Measuring span Maximum permissible
operating pressure MAWP
(PS)
Maximum test
pressure
0.01 … 1 bar
1 ... 100 kPa
0.15 … 14.5 psi
Refer to the information on the nameplate of the pressure
transmitter and the data on the mounting flange
1)
0.04 … 4 bar
4 ... 400 kPa
0.58 … 58 psi
0.16 … 16 bar
0.016 ... 1.6 MPa
2.3 … 232 psi
0.6 … 63 bar
0.063 ... 6.3 MPa
9.1 … 914 psi
1)
The MAWP value of the pressure transmitter can be lower than the PN value of the mounting
flange and vice versa. To determine the maximum permissible operating pressure and the
maximum permissible test pressure, use the lowest value as reference.
Gauge pressure measuring limits with front-flush diaphragm
Lower measuring limit
● Measuring cell with silicone oil filling
100 mbar a/10 kPa a/1.45 psi a
● Measuring cell with inert oil
100 mbar a/10 kPa a/1.45 psi a
● Measuring cell with FDA-compliant oil
100 mbar a/10 kPa a/1.45 psi a
Upper measuring limit 100% of max. range
Technical data
8.1 Input
SITRANS P320/P420 with 4 to 20 mA/HART
62 Compact Operating Instructions, 09/2018, A5E38874562-AB
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