4) Installation
Fig 3 Fixing hole locations
IS-D105 sounders should only be installed by trained
competent personnel.
4.1 Mounting
The IS-D105 sounder may be secured to any flat surface
using the two M6, 147.0mm pitch fixing centres. The
enclosure provides IP66 protection and is suitable for
installation in exterior locations providing it is positioned so
that water cannot collect in the horn, and the cable entry is
sealed.
4.2 Installation procedure
a. Secure the IS-D105 sounder to a flat surface via the
two M6, 147.0mm pitch fixing centres in the mounting
feet.
b. Remove the front of the sounder by unscrewing the
four captive screws and pulling the front away from
the enclosure.
c. Remove the PVC grommet and fit a 20mm cable
gland or conduit entry into the hole in the enclosure
and connect the field wiring to the appropriate sounder
terminals as shown in section 6 and fig 2 of this
manual. The power supply ter and - are
duplicated so that sounders may be connected in
parallel, or an end of line monitoring resistor may be
fitted.
d. Select the required output tone by positioning the 6-
way DIP switch as shown in Table 1.0 and Fig 2.
e. Apply power to the sounder and adjust the internal
volume control to provide the required sound level.
f. Replace the front of the sounder and tighten the four
captive cover screws.
5) Electrical System Design For Installation In
Hazardous Areas Using Zener Barriers
5.1 Single stage alarm
If the control switch is in the positive supply, or the power
supply is being turned on and off, only a single channel Zener
barrier is required as shown in Fig 3. This circuit may also be
used if the sounder is being controlled by a mechanically
activated switch on the hazardous area side of the barrier.
Fig 4 Single stage alarm using single channel barrier.
If the control switch must be in the negative supply, the circuit
shown in Fig 4 may be used. Any diode return barrier certified
Ex ia by a EC Notified Body may be used, providing its
voltage drop is less than 0.9V.
Fig 5 Single stage alarm using two channel barrier.
5.2 Multi-stage alarm
Connecting terminal S2 to 0V activates the second stage
alarm, and similarly terminal S3 for the third stage alarm. Fig
5 shows how the diode return barriers may be used. If only
two stages of alarm are required the third stage barrier
should be omitted, the 28V 93mA barrier and the single diode
return channel may then be contained in one package.
Fig 6 Multi stage alarm using Zener barriers.
Barrier
Power
Supply
28V 93mA
Positive
Safe Area
Hazardous Area
IS-D105 Sounder
Terminals
On/Off*
0V
+
To a
maximum
of 2 other
sounders
Barrier
Power
Supply
28V 93mA
Positive
Safe Area
Hazardous Area
IS-D105 Sounder
Terminals
On/Off*
0V
+
Barrier
Power
Supply
28V 93mA
Positive
Safe Area
Hazardous Area
IS-D105 Sounder
Terminals
On/Off*
Diode Return
Barrier
Diode Return
Barrier
Diode Return
Barrier
3
rd
Stage*
2
nd
Stage*
+
0V
To a
maximum
of 2 other
sounders
To a
maximum
of 2 other
sounders
Detail of Fixing
Points
