Sgs, Displacement Transducers, Potentiometric And Lvdt Sensors - HBM MP85A Operating Manual

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3.4.2 SGs, displacement transducers, potentiometric and LVDT sensors

In "carrier-frequency amplifier" mode, the following transducer types can be
connected:
Screw terminals 5 and 6
for transducer connection
SENSOR X
1
SENSOR Y
1
SG and inductive full bridges,
piezoresistive transducers
wh
Measurement signal (+)
bk
Bridge excitation
voltage (−)
rd
Measurement signal (−)
bu
Bridge excitation
voltage (+)
gn
Sense lead (+)
gy
Sense lead (−)
ye
Cable shield
Potentiometric transducers
2
1
3
Cable color code:
wh= white; bk= black; bu= blue; rd= red; ye = yellow; gn= green; gy= gray
*)
half bridge function
Fig. 3.4: Connecting different transducers in
When connecting a transducer in four-wire configuration, the sense lines must
be connected to the appropriate bridge excitation circuit (Pin 3 with Pin 2 and
Pin 5 with Pin 4). With cable lengths >50 m, a resistor with half the value of
the bridge resistance (RB/2) must be connected instead in each sense lead of
the transducer.
HBM
MP85A(-S)
8
8
1
2
6
4
5
3
Hsg.
*)
Measurement
1
signal (+)
2
Bridge excitation
voltage (−)
4
Bridge excitation
voltage (+)
Hsg.
Cable shield
5
Sense lead (+)
3
Sense lead (−)
MP85A process controller
SG and inductive half bridges
wh
Measurement
signal (+)
bk
Bridge excitation
voltage (−)
Bridge excitation
bu
voltage (+)
gn
Sense lead (+)
gy
Sense lead (−)
ye
Cable shield
LVDT transducer
Measurement
signal (+)
Bridge excitation
voltage (−)
Bridge excitation
voltage (+)
Measurement
signal (−)
Cable shield
Sense lead (+)
Sense lead (−)
"
carrier-frequency amplifier" mode
MP85ADP(-S)
1
2
4
5
3
Hsg.
1
2
4
6
Hsg.
5
3
A2392−5.0 en