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3 Installation
The Channel Module can provide one of three forms of output. The
output appears at terminal 16 and 17 of the terminal strip, and is selected
by jumper setting as in the following table:
3.5 Combustible Sensors
The sensors should be mounted with their long axis vertical and the
sensing surface downward. It is recommended that any terminal lugs be
attached to the sensor by soldering as well as by crimping. However, care
must be observed to insure that solder does not flow onto the area where
the terminal screws must seat, as that can make it difficult to get firm,
permanent seating of the screws. If conduits carrying the sensor leads to
the control unit also carry other electrical wiring, the sensor leads must be
shielded.
The Channel Modules may support one or two sensors (dual-sensor
option). When the dual-sensor option is used, the two sensors connected to
a Channel Module should monitor related areas. For example, in an area
where wind may cause leaking combustible gases to drift in different
directions, the two sensors can be placed on opposite sides of the monitor-
ing area. Then, in the event of a leak, either of the sensors may activate
the Channel Module alarm.
3-10
Teledyne Analytical Instruments
Model 1220
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