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3 Design and principle of oper-
ation
The Type 6132 p/i Converter is used as an
intermediate element between pneumatic
and electric control and measuring equip-
ment. The input variable is a pneumatic sig-
nal and the output variable an electric DC
current signal or DC voltage signal. The
pneumatic input signal from 0.2 to 1 bar is
converted into an electric DC signal from
0/4 to 20 mA or a DC voltage signal from
0/1 to 5 V or 0/2 to 10 V.
4
p
0,2...1 bar
(3...15 psi)
Fig. 3-1: Schematic diagram of the Type 6132 p/i Converter for four-wire connection
EB 6132 EN
P
2
3
1
Design and principle of operation
Principle of operation (see Fig. 3-1)
A capacitive ceramic pressure sensor (1) is
used to convert the pressure p of the pneu-
matic input signal into an electric DC volt-
age signal.
The DC voltage signal which is proportional
to the pressure is amplified to a defined level
in the measuring amplifier (3). Lower range
value and span can be adjusted at the po-
tentiometers located on the front panel (ap-
prox. ±10 %).
The output stage (4) issues a load-indepen-
dent DC current signal or DC voltage signal.
The type of output signal (mA or V) can be
set at the switches.
The power supply unit (5) is used for the volt-
age supply and galvanic isolation.
AC/DC
p
Pneumatic input signal
1
Pressure transducer
2
Measuring amplifier and
potentiometers for adjusting ZERO
and SPAN
mA, V
3
Output stage
4
Power supply unit
3-1
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