Teledyne 1220 - Multipoint flammable gas and vapor detection system - Manual (Page 28)

3 Installation Model 1220
3-10
Teledyne Analytical Instruments
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 direc-
tions, the two sensors can be placed on opposite sides of the monitoring area.
Then, in the event of a leak, either of the sensors may activate the Channel
Module alarm.