Description
4
4.1 Area of application
Depending on the variant, the pressure transmitter measures corrosive, non-corrosive and
hazardous gases, vapors and liquids.
You can use the pressure transmitter for the following measuring tasks:
●
Gauge pressure
●
Absolute pressure
● Differential pressure
With the appropriate configuration and the necessary add-on parts (e.g. limiters and remote
seals), you can also use the pressure transmitter for the following measuring tasks:
● Level
● Volume flow
● Mass flow
● Volume
● Customized characteristic curve
The output signal for all measuring tasks is a direct current of 4 to 20 mA.
You can install the "intrinsically-safe" or "flameproof enclosure" version of the pressure
transmitter in hazardous areas. The devices have a test certification and comply with the
corresponding directives.
Pressure transmitters with remote seals of various shapes can be provided for special
applications. For example, measuring high-viscosity substances is a special application.
Operate the device in accordance with the specifications in section Technical data (Page 199).
Gauge pressure
This version measures aggressive, non-aggressive and hazardous gases, vapors and liquids.
There are two series: a "differential pressure" series and a "gauge pressure" series. The
"differential pressure" series is distinguished by a high overload capability.
Differential pressure and flow
This version measures corrosive, non-corrosive and hazardous gases, vapors and liquids. You
can use this version for the following measurement types:
● Differential pressure, e.g. effective differential pressure
● Gauge pressure, suitable for small positive or negative pressure value
● Together with a primary element
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC 25
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