Detcon DM-600IS - Manual (Page 8)

DM-600IS
DM-600IS Instruction Manual Rev 1.5.9 Page 4 of 37
1.3 Base Connector Board
The base connector board is mounted in the explosion proof enclosure and includes: the mating connector for
the control circuit, reverse input and secondary transient suppression, input filter, alarm relays, lugless
terminals for all field wiring, and a terminal strip for storing unused programming jumper tabs. The alarm
relays are contact rated 5 amps @ 125 VAC, 5 amps @ 30 VDC and coil rated at 24 VDC. Gold plated
program jumpers are used to select either the normally open or normally closed relay contacts.
NOTE: The yellow wire should not be connected and should be cut off!
Figure 3 Base connector board
1.4 Explosion Proof Enclosure
The transmitter electronics are packaged in a cast metal explosion proof enclosure. The enclosure is fitted with
a threaded cover that has a glass lens window. Magnetic program switches located behind the transmitter
module face plate are activated through the lens window via a hand-held magnetic programming tool allowing
non-intrusive operator interface with the sensor. Calibration can be accomplished without removing the cover
or declassifying the area. Electrical classification is Class 1; Groups B, C, D; Division 1 (explosion proof). The
sensor housing section employs an Intrinsically Safe Barrier circuit which allows for the safe usage of plastic
housing materials in the lower section. This design benefit avoids the requirement for stainless steel flame
arrestors which reduce the sensitivity and response time to “active” gas species such as NH3, CL2, CLO2, and
HCL...etc.
Transmitter Electronics in
Explosion-Proof Housing
Intrinsically Safe
Sensor Head
Figure 4 Explosion-Proof Enclosure