European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: +44 (0)208 743 8880
Document No. D157-00-671-IS
Issue 2
06-03-2023
Sheet 6 of 14
Config.
Voltage
Configuration Description
Features
Product
Option
Identifier
See documents D190-06-651 for DC schematic diagrams.
1a
DC
Single Stage Configuration
•
Line monitoring
•
Positive Switching
1
1b
DC
Two Stage Configuration
•
Common Negative
•
Positive Switching
1
1c
DC
Three/Four Stage Configuration
•
Common Negative
•
Positive Switching
1
2
DC
Three/Four Stages. Voltage Free 2nd, 3rd &
4th Stage Activation Configuration
•
Common Positive
•
Customer Set H1 & H2 to Negative
Switching
1
Table 3: Summary of Wiring Options.
9) End of Line Monitoring (DC Units)
All DC units have a blocking diode fitted in their supply input
lines. An end of line monitoring diode or an end of line
monitoring resistor can be connected across the +ve and
–
ve
terminals in the flameproof chamber.
If an end of line resistor is used it must have a minimum
resistance value of 3k3 ohms and a minimum wattage of 0.5W
or a minimum resistance value of 500 ohms and a minimum
wattage of 2W.
The resistor must be connected directly across the +ve and -
ve terminals as shown in the following drawing. The resistor
leads should be kept as short as possible.
SIL2 line monitoring module product version: see section 19
for standard default values and product coding. See document
D190-06-651 for associated wiring diagram.`
Figure 11: End of Line Resistor placement.
Note that the maximum forward polarity monitoring voltage is
6V. A monitoring voltage greater than 6V may activate the
alarm horn sounder and the 2nd, 3rd or 4th stages.
10) Maintenance, Overhaul and Repair
Maintenance, repair and overhaul of the equipment should
only be carried out by suitably qualified personnel in
accordance with the current relevant standards:
EN60079-19/IEC60079-19
Explosive atmospheres
–
Equipment repair, overhaul and
reclamation
EN 60079-17/IEC60079-17
Explosive atmospheres
–
Electrical installations inspection
and maintenance
Flameproof threaded joints and cemented joints are not
permitted to be repaired.
Units must not be opened while an explosive atmosphere is
present.
If opening the unit during maintenance operations a clean
environment must be maintained and any dust layer removed
prior to opening the unit.
Electrostatic charging hazard - Clean only with a damp cloth.
