32 M2A Transmitter Operator’s Manual
CT-7 Series Toxic Detectors
The CT-7 Series toxic detectors have one black wire and one color coded wire. Connect the color coded wire
(see chart below) to the terminal labeled TOXIC + and the black wire to the terminal labeled TOXIC -.
Figure 29: CT-7 Series Toxic Detector Wiring
6. To gain access to a plug-in terminal strip for wiring, pull it out of its socket by grasping the wall between
two terminal positions with needle nose pliers and pulling. Be careful not to exert too much force on the wall
to avoid damage to the terminal strip. The detector terminal strip and the alarm 1 relay terminal strip may be
removed by grasping them with your fingers if the adjacent terminal strips have been removed.
WARNING: If the M2A is installed in a hazardous location, use appropriately rated conduit, conduit
fittings, and appropriate construction technique that complies with the local electrical code.
In addition, use appropriately rated conduit, conduit fittings, and appropriate construction
technique to maintain the NEMA 4X environmental rating of the junction box and avoid
water entering the junction box at the conduit ports.
ALARM 1
C NC NO
TOXIC OXY
RS 485
C NC NO
ALARM 2
A B C
PWR / SIG
S
C NC NO
Not
Used
FAIL
CL2 yellow
CLO2 violet
red
NH3
white
HCN
Black
See Chart
Gas Type + Wire
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