12
CHAMANUAL 0917
KAM CONTROLS, INC.
I N S TA L L AT I O N C O N T I N U E D
POWER WIRING
CAUTION: When electronics enclosure is open, be extremely careful to avoid any contact with interior fiber optic
connections. Failure to do so could result in the CHA malfunctioning.
DO NOT open electronics enclosure, even when isolated, when an explosive atmosphere may present.
To reduce the risk of ignition to hazardous atmospheres, disconnect the equipment from the supply circuit before
opening, keep assembly tightly closed when in operation.
For installation using conduit: All conduit runs must have a sealing fitting connected within one conduit diameter or
2”(50mm), whichever is less.
For installations in the EU: all cable entries stopping cables or plugs shall be certified per the requirements in
EN60079-1.
CAUTION: The KAM
®
CHA™ is NOT loop powered. Connection of power wiring to 4-20 mA (LOOP1 and LOOP2, Fig.
3-13) will result in malfunctioning of the instrument and damage to the electronics boards.
KAM CHA
3939 Ann Arbor Drive
Houston, Texas
77063, USA
+1 713 784 0000
www.KAM.com
485 +
485 -
Loop2 In
Loop2 R
TN
Loop1 R
TN
Loop1 IN
GND
Vin ( – )
Vin ( + )
LED3
LED1
LED2
POWER IN
J5
1
2
3
4
J7
ASTM
SA
YBOL
T
PT/CO
HAZE
FIG. 3-13
Power Wiring (12-24 VDC, 5 watts maximum)
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