HBM ME10 Mode D'emploi page 9

ME10
2 Electrical Connection
2.1 Transducer Connection
Strain gauge transducers are connected by means of 6−wire circuits.
With transducers in 4-wire technology the sensing leads are not needed. In
this case the contacts 32a+c and 28a+c on the connector must be linked.
For cable lengths >50 m, one resistor with half the bridge resistance value
(BR/2) must be solder into the transducer in place of each feedback bridge. If
the transducers are calibrated in six−wire connection, the resistors must be
solder directly into the sensor circuit.
measuring signal (−)
sensing line to 32a (−)
bridge supply voltage (−)
measuring signal (+)
bridge supply voltage (+)
sensing line to 28c (+)
screen . . . . . . . . . . . . . . . . . .
Fig. 2.1: Bridge connection
The required bridge supply voltage is 5 V (symmetrical about ground) as set
factory sttings. It can be reduced to 2.5 V, resp. 10 V, by switch S25.
U
B
2,5 V
5 V
10 V
The safety barriers SD01A must be wired into the connecting lines (see chap-
ter 5.4) for transducers in EEx(i) design.
A0762−4.0 en/de/fr
contact
. . . . . . pin 30a
. . . . . pin 32c
. . pin 32a
. . . . . . pin 30c
. . pin 28a
. . . . . pin 28c
pins 31a+c
(alternatively 29a+c)
Bridge resistancde
R ≥60...4000Ω
B
R ≥110...4000Ω
B
R
≥220...4000Ω
B
rd
gy
bk
wh
bu
gn
ye
S25
1 2 3
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HBM