RKI Instruments M2A - Manual (Page 26)

21 M2A Transmitter Operator’s Manual
• ESM-01 Toxic Detectors
The ESM-01 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 25: ESM-01 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 hubs.
7. Guide multi conductor shielded cable or cables or wires in conduit through the conduit hub on
the left side of the junction box.
WARNING: If the top conduit hub is used for wiring, be sure to seal the threads to ensure
water does not enter the junction box. A conduit seal, which is normally
required to maintain the junction box’s hazardous location rating, will also help
to prevent water from entering through the top port.
Black
Orange NO
Green PH3
Blue SO2
Brown AsH3
Yellow Cl2
NH3 Red
Wire Color Gas Type
See Chart
C
N
C
N
O
AL
A
R
M
1
C
NC
NO
AL
AR
M
2
C
NC
NO
FA
IL
-
S
+
PW
R
/S
IG
TO
X
IC
O
X
Y
+
-
+
-
RS
4
8
5
A
B
C