42
Clip
HBM A0114-6.3 en
6 Safety barriers
Connect HBM safety barriers to obtain intrinsically safe measuring circuits
[EEx ia] IIC. A test certificate is required for transducers used in such applica-
tions.
Measuring amplifier Safety barrier
AE101 SD01A
AE301 SD01A
Due to the safety barriers’ high internal resistance, the bridge excitation volt-
age V
E
must be reduced according to the transducer resistance R
B
or the
transducer inductance L
B
respectively. Refer to the below table to obtain the
minimum permissible transducer resistance.
Measuring amplifier V
E
R
B
(minimum)
*)
, L
B
AE101 10 V not permissible
5 V 320 Ω
2.5 V 130 Ω
AE301 5 V 320 Ω
2.5 V 130 Ω
*)
With longer cables the supply-line resistance must be added.
7 CLIP IG
For use in industrial environments, the CLIP modules can be installed in an
aluminium-die-cast wall housing. The degree of protection is IP65. The hous-
ing enables max. 4 modules incl. power supply unit to be inserted; it is also
possible to insert two measuring amplifiers with safety barriers.
The wall-housing version is particularly suitable for rough environments. It is
protected from electromagnetic interference in the surroundings.
The CLIP IG devices are mounted at the factory and wired internally.
All combinations are available on request.
Attached to CLIP IG devices accessory bags 2-9278.0339 are delivered in-
cluding a standard set of earthing bushes, end sleeves for strands (0.5 mm
2
,
10mm long) and non-buckling bushes that fit HBM cables of type
KAB8/00-2/2/2 (6 x 0.14 mm
2
) or
Order No. 4-3301.0082, blue (6 x 0.14 mm
2
) or
4-3301.0071, gray (6 x 0.14 mm
2
)
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