European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: +44 (0)208 743 8880
Document No. D190-00-051-IS
Issue 1
03-02-2022
Sheet 6 of 7
8) End of Line Monitoring (DC Units)
8.1 Standard DC End Of Line Monitoring
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. See D190-06-001 for details.
Figure 8: End of Line Resistor placement.
8Custom DC Multi-Stage End Of Line Monitoring
An optional 12-way terminal module is available to enable up to four
alarm stages to be activated from three DC voltage output channels.
The three alarm stage activation inputs can be independently
monitored.
Refer to Schematic D190-06-001, Config. 6.
Specify Product option ‘V’ when ordering.
Spare part code for field installation: SP78-0001
9)
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:
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.
Potential electrostatic charging hazard
– Clean only with a damp
cloth.
Figure 9: End of Line Resistor placement
–
Optional 12-Way Terminal Module.
