Measuring Cell Operation - Siemens Sitrans P500 Operating Instructions Manual

Description
3.5 Functional principle
● The digital signal is analyzed in a microcontroller
and thermal characteristics.
● It is then converted in a digital-to-analog converter
A diode circuit provides reverse polarity protection.
● The measuring cell specific data, electronics data and parameterization data are saved in
two EEPROM
incorporated in the electronics.
Operation
● Use the keys
● If your device has a display
messages from the device visually.
● Other settings can be implemented with a computer using a HART modem
3.5.2

Measuring cell operation

Toxic and hot media leaks
If the measured signal fails because of sensor breakage, the seal diaphragm and the
overload system may also be destroyed. In the worst case scenario of devices with a
destroyed seal diaphragm, the process medium leaks on the side ventilated with reference
pressure.
In case of sensor breakage, deactivate the lines to the device or depressurize the lines.
In the following sections, the process variable to be measured is called general inlet
pressure.
Overview
The following principles of operation are described:
● Differential pressure and flow rate
● Level
The following process connections are available, for example:
● ¼ - 18 NPT
● Flanged connection In accordance with EN 61518
26
⑥
. One EEPROM is located in the measuring cell, the other is
⑧
to navigate and set different parameters.
CAUTION
④
⑤
⑨
, you can perform the parameter settings locally and track
Operating Instructions, 12/2014, A5E02344528-09
and corrected with regard to linearity
to the output current of 4 to 20 mA.
⑦
SITRANS P500 with HART
.