Data Sheet for Product

Technical Instructions 7MF15654 Pressure Transmitter, PSIG Range for Sensing Liquid/Gas
Document Number 155-768
September 16, 2021
Page 2 Siemens Industry, Inc.
Design
The design of the pressure transmitter is dependent on the measuring range.
Measuring range
<1 bar (<14.5 psi)
The main components of the pressure transmitter are:
• Stainless steel housing with piezo-resistive silicon measuring cell (with stainless
steel diaphragm, temperature-compensated) and electronics module.
• Stainless steel process connection 1/4 - 18 NPT Straight.
• Electrical connection is made to DIN 43650 with the cable inlet 1/2 – 14 Taper.
Measuring range
> 1 bar (> 14.5 psi)
The main components of the pressure transmitter are:
• Stainless steel housing with ceramic measuring cell and electronics module. The
temperature-compensated ceramic measuring cell has a thin-film strain gauge
which is mounted on a ceramic diaphragm. The ceramic diaphragm can also be
used for aggressive media.
• Stainless steel process connection 1/4 - 18 NPT Straight.
Electrical connection is made to DIN 43650 with the cable inlet 1/2 – 14 Taper.
Function
The pressure transmitter measures the gauge pressure as well as the level of liquids
and gases.
Mode of Operation
Figure 1. Functional Diagram.
The mode of operation of the pressure transmitter is dependent on the measuring
range.
Measuring range <1 bar
(<14.5 psi)
The silicon measuring cell of the pressure transmitter has a piezo-resistive bridge to
which the operating pressure is transmitted through silicone oil and a stainless steel
diaphragm.
The measuring cell output voltage is fed to an amplifier and converted into a 4 to 20 mA
output current.
The output is linearly proportional to the input pressure.