Detcon 1000_H2S - Manual (Page 13)

Model 1000 H2S Echem
Model 1000 H2S Echem Instruction Manual Rev. 2.8 Page 9 of 30
3.3 Electrical Connections
AIR FLOW SAMPLE FLOW
+ + 24VDC
OUT
2.1A 18-36
VDC IN
+ +
24VDC
OUT
2.1A
18-36
VDC
IN
+ +
24VDC
OUT
2.1A
18-36
VDC
IN
4-20mA, RS485,
Alarm/Fault Sensor Relays
Low Flow Air/ Sample Relays
(Optional)
117VAC / 24VDC In
Customer Connections
+24VDC
-24VDC
(Ground)
INPUT
+
-
Figure 10 Installation Wiring Connections
1. For AC powered unit connect 117/220VAC to the terminal connector labeled “VAC IN” ( JP8A) inside
the explosion-proof enclosure on the upper right. If applicable, connect 24VDC to the Terminal
Connector Board labeled “VDC IN” (JP7A) (See Figure 10.)
2. The 4-20mA and/or RS-485 signal outputs should be wired from the terminal PCB and then out the right
side of the “Power Supply” explosion-proof enclosure (Figure 10).
3. Discrete alarm relay contacts are provided for three alarms: Fault, Low and High. The contacts consist of
common and choice of normally open or normally closed. Contact output selections are jumper
programmable on the sensor connector board. See DM-624 wiring diagram for details. These connections
also should be wired out of the right side of the “Power Supply” explosion-proof enclosure. (Figure 10).
4. Optional Low Flow Fault alarms for Sample gas and Air are available. They provide a form “C” relay
contact (common, normally open and normally closed) rated 1 amp at 30VDC/0.24 amp at 125VAC.
Relay contacts are pre-wired to the I/O connector PCB located in the “Power Supply” explosion-proof
enclosure and are labeled “FLO FLT1” and “FLO FLT2” respectively (Figure 10).