7
PROTECT SRB 101EXi-1A
Operating instructions
Safety-monitoring module
EN
8.4 Actuator configuration
Single-channel control with feedback circuit (Fig. 17)
• Suitable for increase in capacity or number of contacts by
means of contactors or relays with positive-guided contacts.
• If the feedback circuit is not required, establish a bridge.
According to EN 60079-11, the following must be observed
for the installation: a distance of ≥ 6 mm must be observed
between the terminals of the intrinsically safe current circuits
and other intrinsically safe current circuits. Between the
terminals of the intrinsically safe current circuits and other,
non-intrinsically safe current circuits, a distance of ≥ 50 mm
must be observed.
Dual-channel control with feedback circuit (Fig. 18)
• Suitable for increase in capacity or number of contacts by
means of contactors or relays with positive-guided contacts.
• If the feedback circuit is not required, establish a bridge.
According to EN 60079-11, the following must be observed for
the installation: a distance of ≥ 6 mm must be observed between
the terminals of the intrinsically safe current circuits and other
intrinsically safe current circuits. Between the terminals of the
intrinsically safe current circuits and other, non-intrinsically safe
current circuits, a distance of ≥ 50 mm must be observed.
X1 X3
21
13
22
14
a)
K
A
S
L1
N
K
A
+24 VDC
X1 X3
21
13
22
14
a)
K
A
K
B
S
L1
N
K
B
K
A
+24 VDC
Fig. 17
a) Control
S
= Feedback circuit
Fig. 18
a) Control
S
= Feedback circuit
9 Simple electrical apparatus
An assessment of simple electrical apparatus
to EN 60079-11 and EN 61241-11 must be executed.
As simple electrical apparatus within the meaning of intrinsic safety
do not represent a potential source of ignition, the Directive 94/9/EC
is not applicable. To demonstrate the intrinsic safety to EN 60079-14,
a declaration of the manufacturer therefore can be used.
The devices classified as simple electrical apparatus
can be used in the Zones 1 /2 and 21 / 22.
Only the intrinsically safe current circuit of the SRB 101EXi-1A
must be wired to the simple electrical apparatus.
Requirements for the intrinsically safe current circuit:
• The enclosures have at least protection class IP 54 (EN 60529) for gas,
IP6X for dust (IP5X in case of non-conductive dusts in Zone 22).
9.1 Devices that can be used as simple electrical apparatus
On the basis of a valid declaration of the manufacturer with an assess-
ment as simple electrical apparatus, the following devices can be used:
Reset buttons
• EX-RDT... (Elan Schaltelemente GmbH & Co. KG)
• EX-RDM... (Elan Schaltelemente GmbH & Co. KG)
Emergency stop control devices
EX-RDRZ... (Elan Schaltelemente GmbH & Co. KG)
Solenoid interlocks
• EX-AZ 16-...-3D (K.A. Schmersal GmbH)
• EX-AZ 17-...-3D (K.A. Schmersal GmbH)
• EX-AZ 335-...-3D (K.A. Schmersal GmbH)
• EX-AZ 355-...-3D (K.A. Schmersal GmbH)
• EX-AZ 415-...-3D (K.A. Schmersal GmbH)
• EX-AZ 3350-...-3D (K.A. Schmersal GmbH)
• EX-Z/T 235-...-3D (K.A. Schmersal GmbH)
• EX-Z/T 335-…-3D (K.A. Schmersal GmbH)
Safety sensors
• EX-BN 20-...-3G/D (K.A. Schmersal GmbH)
• EX-BNS 33-...-3G/D* (K.A. Schmersal GmbH)
• EX-BNS 120-...-3G/D* (K.A. Schmersal GmbH)
• EX-BNS 180-...-3G/D (K.A. Schmersal GmbH)
• EX-BNS 303-...-3G/D* (K.A. Schmersal GmbH)
* however version without LED
9.2 Guidelines for installation
Range of application to the ATEX Directives:
• Category 2G, 3G: use in explosion-endangered areas due
to the presence of gas of Zone 1 and 2
• Category 2D, 3D: use in explosion-endangered areas due
to the presence of dust of Zone 21 and 22
For reset buttons, emergency stop command devices, interlocking
devices and magnetic safety switches, the following is applicable:
Instructions for the installation:
• The risk of mechanical damage to the simple electrical apparatus
must be observed depending on the place of installation. Additional
measures to provide for a mechanical protection are useful, for in-
stance when a potential difference through the earth wire can
occur due to damage.
Technical data in the intrinsically safe current circuit:
• Voltage U
o
: 33.6 V
• Current I
o
: 57.0 mA
• Capacity P
o
: 479 mW (linear characteristic)
• C
o
capacity: refer to the table with Ex-relevant data
• L
o
inductivity: refer to the table with Ex-relevant data
Cable/wire (example):
• A mechanical protection for the cable(s) must be provided.
• The cable(s) must be separated from other, non-intrinsically
safe current circuits.
