Cooper Crouse-Hinds GmbH
11
11
11
11
11
Glass for measuring instrument AM/VM45
4
Field of application
The control units are intended for use in
potentially explosive atmospheres in zones 1,
2 as well as in Zones 21 and 22 in accordance
with IEC 60079-10.
The enclosure materials used, including any
external metal parts, are high quality materials
that ensure a corrosion resistance and
resistance to chemical substances according
to the requirements for use in a ”normal
industrial atmosphere”
- impact resistant polyamide
- special steel AISI 316 L.
In case of use in an extremely aggresive
atmosphere, please refer to manufacturer.
5
Application / Properties
The control units GHG 411 and 412 are
intended for the local control of electrical
installations in potentially explosive
atmospheres. The units are fitted with built-in
components according to the respective
application.
Specially marked special versions of the
control units can be used in ”intrinsically safe
circuits”.
The electrical limiting values that are decisive
for the intrinsic safety shall be observed.
The version with gold-tipped contacts is
suited for switching extra-low voltage circuits.
Special attention shall be paid to the
maximum current load (see technical data,
pages 8 and 9). The contact chamber of the
gold-tipped version is marked with the letter
”G” or colour-coded.
Glass for measuring instrument AM/VM72
Dimension for actuator elements
X = fixing dimensions
Switch- and potentiometer actuator
2
1
Fig. 1
Explosion-protected control units GHG 411 / 412
3
Conformity with standards
The apparat is conform to the standards
specified in the EC-Declaration of conformity.
It has been designed, manufactured and
tested according to the state of the art and to
DIN EN ISO 9001.
94/9 EC: Equipment and protective systems
intended for use in potentially explosive
atmospheres.
The control units fulfil further requirements,
such as the EC directive on electromagnetic
compatibility (2004/108/EEC).
To ensure a safe and reliable disconnection,
the normally closed contacts are designed as
compulsory opening contacts.
Where required, the bases are fitted with
0.6 W resistors, fine-wire fuses and diodes
(max. power dissipation 1 W).
The measuring instruments are used for the
local indication of electrical values. See
”Technical Data” for details of measuring
mechanism, accuracy and connection.
When the switch collar of small control
switches is cut out at the respective locking
position, they can be padlocked (padlock
shackle Ø up to 5mm).
With measuring instruments AM/VM72 and
AM/VM45 for c.t. connection n/1A (Fig. 1, item
2) the interchangeable scales can be
exchanged via a flap on the upper part of the
measuring instrument (Fig. 1, item 1).
The 4 pole pushbutton contact can be added
with the standard CCH actuators. If the 4
pole pushbutton contact is added with an
Emergency STOP Mushroom-head
pushbutton actuator, then you have to use
the actuators with CCH order number
GHG 410 1437R.
This actuators can be recognize by the red
thrust washer and black inserting sign.
The data according to sections 3 and
4 shall be taken into account during use.
Applications other than those
described are not permissible without a
written declaration of consent from
Messrs. COOPER Crouse-Hinds.
During operation the instructions
stated in section 7 of the operating
instructions shall be observed.
The sole responsibility with respect
to the suitability and proper use of the
control switches with regard to the basic
requirements of these instructions (see
technical data) lies with the operator.