Siemens SITRANS P - Connecting; 6.1 Basic safety instructions

Absolute pressure measuring limits from
gauge pressure series
• Measuring cell with inert oil
For process temperature
-20 °C < ϑ ≤ 60 °C (-4 °F < ϑ
≤ +140 °F)
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) (140 °F
< ϑ ≤ 212 °F (max. 185 °F for
measuring cell 435 psi))
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
Upper measuring limit 100% of max. range (for oxygen measurement: max. 100 bar/10 MPa/1450 psi
and 60 °C ambient temperature/medium temperature)
Lower range value Between the measuring limits (continuously adjustable)
8.1.5 Absolute pressure with front-󹪞ush diaphragm
Absolute pressure with front-󹪞ush diaphragm
Measurand Absolute pressure
Measuring span (continuous‐
ly adjustable) or measuring
range, max. operating pres‐
sure and max. test pressure
Measuring span
1)
Maximum permissible
operating pressure MAWP (PS)
Maximum test
pressure
43 … 1300 mbar a
4.3 ... 130 kPa a
17 … 525 inH
2
O a
Refer to the information on the nameplate of the pressure
transmitter and the data on the mounting 󹪞ange
2)
166 … 5000 mbar a
16.6 ... 500 kPa a
2.41 … 72.5 psi a
1 … 30 bar a
0.1 ... 3 MPa a
14.5 … 435 psi a
Depending on the process connection, the measuring span may di󹪜er from these values
1)
For devices with functional safety, the minimum permissible measuring span is limited by the
turndown. Therefore, ensure that the con󹪝gured turndown is no higher than 5:1.
2)
The MAWP value of the pressure transmitter can be lower than the PN value of the mounting
󹪞ange and vice versa. To determine the maximum permissible operating pressure and the
maximum permissible test pressure, use the lowest value as reference.
Absolute pressure measuring limits with front-󹪞ush dia‐
phragm
Lower measuring limit
• Measuring cell with silicone oil 󹪝lling
0 mbar a/kPa a/psi a
Upper measuring limit 100% of max. range
Lower range value Between the measuring limits (continuously adjustable)
Technical data
8.1 Input
SITRANS P320/P420
Compact Operating Instructions, 01/2021, A5E38874562-AC 65