Detcon 440 - Manual (Page 6)

2.0 Syst em Operation
The Model 440-RD receives the data for remote display from the host Model 440 Controller. The system
displays current status information on its LCD display, which includes the gas channel #, current reading,
gas type, and alarm LED status.
Figure 1 System Operational Diagram
SYSTEM OPERATION BLOCK DIAGRAM SCHEMATIC
ALM 1 ALM 2 ALM 3 FAULT
CH1 99 PPM CL2
CH2 80 PPM SO2
CH3 45 PPM H2S
CH4 00 PPM NH3
RS- 485 Input From
Master Model 440
Controller
Input Power
115/230 VAC
11.5-30 VDC
MODEL 440-RD
Gas Detection/Alarm System
Model 440-RD Operator Manual Rev. 1.0.2 Page 2 of 14