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Physikalisch-Technische Bundesanstalt
Braunschweig und Berlin
Test Report PTB Ex .......................
(13)
(14)
(15) Description of Equipment
The Model 4746-2 and 4746-3... Limit Switches serve for converting mechanical manipulated
variables into electrical signals. Depending on the version, they are equipped with various types
of limit contacts. They are intended for attachment to pneumatic, electrical or hydraulic actuators
installed inside and outside of hazardous areas.
The Model 4746-2...and 4746-3... Limit Switches are passive two-terminal networks that may be
connected to all certified intrinsically safe circuits, provided the permissible maximum values of
U
, I
and P
i
i
Electrical connection is made by means of plugs and sockets or cable entries.
The relation between temperature classification and the permissible maximum ambient
temperature range is specified in the table below:
Electrical data
Contact circuits
(Terminals 41/42
Maximum values:
Effective internal capacitance:
Effective internal inductance:
(Terminals 41/42/43
and 51/52/53
The results laid down in this test report refer exclusively to the test object and the technical documentation submitted. Test reports without signature
and seal are invalid. This test report may be reproduced unaltered only. Extracts or amendments shall require the prior approval of the Physikalisch-
Ptb08-4746.doc
EB 8365 FR
EC TYPE EXAMINATION CERTIFICATE No. PTB 98 ATEX 2114
are not exceeded.
i
Temperature class
T6
T5
T4
Type of protection: Intrinsic safety EEx ia IIC only for
connection to a certified intrinsically safe circuits
Models 4746-2.0., Model 4746-2.1., Model 4746-2.5.
with inductive proximity switch.
Model 4746-3.2, Model 4746-3.6 with electric
micros witch
Physikalisch-Technische Bundesanstalt – Bundesallee 100 - D 38116 Braunschweig
S c h e d u l e
Ambient temperature range
-45 °C ... +60 °C
-45 °C ... +70 °C
-45 °C ... +80 °C
U
i
I
i
P
i
C
i
L
i
Technische Bundesanstalt.
=
16 V
=
52 mA
=
169 mW
=
60 nF
=
250 µH
14-19
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