● You can make an uninterrupted current measurement with a low resistance ammeter at the
connection ⑩
.
● The measuring cell-specific data, electronics data and parameter assignment data are
saved in two EEPROM modules. The first EEPROM module ⑥ is linked to the measuring
cell, the second EEPROM module ⑪ to the electronics.
Operation
● The buttons⑧ can be used to call up individual functions.
● If you have a device with a display ⑨, you can view the measurement results, parameter
values and messages.
● With a computer and HART modem ⑦, you can operate the device via the engineering
system (e.g. SIMATIC PDM).
4.4.2 Measuring cell
The following modes of operation are described:
● Gauge pressure
● Absolute pressure
● Differential pressure and flow
● Level
The following process connections are available, for example:
● G1/2 B, 1/2-14 NPT
● Male thread: M20
● Flange connection in accordance with EN 61518
● Flush-mounted process connections
Description
4.4 Functional principle
SITRANS P320/P420 with 4 to 20 mA/HART
32 Operating Instructions, 11/2019, A5E44852162-AC
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