6 900 Series V5.0: Installation Guide, April 1999
L1: Line in and out, double terminal (recommended ‘-’)
L2: Line in and out, double terminal (recommended ‘+’)
+R: Remote indicator (LED) positive supply, double terminal
-R: Remote indicator (LED) negative supply, double terminal
Single terminal: An isolated terminal intended as a through connection point for
cable shields or for an earth connection.
It is not necessary to observe polarity on terminals L1 and L2 although it is recommended
that L1 is kept negative for consistency. All fire monitors, except isolators, are not polarity
sensitive.
The standard mounting base is designed so that a fire monitor fits in only one way,
without snagging, using a clockwise motion without insertion force.
All mounting bases have a locking feature whereby a socket screw on each fire monitor
can be turned to locate into a fixing hole in the mounting base. This prevents the
unauthorised removal of a fire monitor
When installing fire monitors in confined spaces, allow 110 mm from the surface for fitting
and removal.
The Aritech 950 Series mounting bases are designed such that the fire monitors do not fit
the isolator mounting base and vice versa. The Series 900 range of fire monitors also
does not fit the base of other Aritech range of monitors.
3.1.1.2. Bases for IU950 isolators - DB951
Figure 2: Wiring diagram for mounting base DB950 and isolator base DB951
The isolator IU950 is fitted into the isolator mounting base DB951.
The base has one double terminal and three single terminals:
L1 IN: Line in, single terminal (negative DC supply)
L1 OUT: Line out, single terminal (negative DC supply)
L2 IN/OUT: Line in and out, double terminal (positive DC supply)
Single terminal: An isolated terminal intended as a through connection point for
cable shields or for an earth connection.
Isolators are polarity sensitive, unlike the other Series 950/970 devices.
REMOTE LED
L1
DB950 Sensor base DB951 Isolator base DB950 Sensor base
Loop return to
control panel
To control panel
− The isolators are polarity sensitive, unlike the other 950/970 devices.
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