
3.6 Functional principle
3.6.1 Overview of mode of operation
This chapter describes how the transmitter works.
First the electronics are described, and then the physical principle of the sensors which are
used with the various device versions for the individual measurement types.
3.6.2 Operation of the electronics
Description
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① Measuring cell sensor ⑦ HART modem
② Measuring amplifier ⑧ Buttons (local operation)
③ Analog-to-digital converter ⑨ Display
④ Microcontroller ⑩ Connection for external ammeter
⑤ Digital-to-analog converter I
A
Output current
⑥ Each with an EEPROM in the measuring cell
and in the electronics
U
H
Auxiliary power
Figure 3-6 Operation of the electronics with HART communication
Description
3.6 Functional principle
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 23
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