Detcon DM-600IS - Manual (Page 17)

DM-600IS
DM-600IS Instruction Manual Rev 1.5.9 Page 13 of 37
DM-500IS-C4H4S Thiophane T90 <140 <5% signal loss/year -20 to +50 -4 to +122 15 to 90 2 years
DM-500IS-C6H5CH3 Toluene T90 <140 <5% signal loss/year -20 to +50 -4 to +122 15 to 90 2 years
DM-500IS-C4H6O2 Vinyl Acetate T90 <140 <5% signal loss/year -20 to +50 -4 to +122 15 to 90 2 years
DM-500IS-C2H3CL Vinyl Chloride T90 <140 <5% signal loss/year -20 to +50 -4 to +122 15 to 90 2 years
*LELrangeH2isnotCSAapproved.
5.0 INSTALLATION
Optimum performance of ambient air/gas sensor devices is directly relative to proper location and installation
practice.
5.1 Field Wiring Table (4-20 mA output)
Detcon Model DM-600IS toxic gas sensor assemblies require three conductor connection between power
supplies and host electronic controllers. Wiring designators are
+
(DC), – (DC), and mA (sensor signal).
Maximum single conductor resistance between sensor and controller is 10 ohms. Maximum wire size for
termination in the sensor assembly terminal board is 14 gauge.
AWG Meters Feet
20 240 800
18 360 1200
16 600 2000
14 900 3000
Table 3 Field wiring Table
Note1: This wiring table is based on stranded tinned copper wire and is designed to serve as a
reference only.
Note2: Shielded cable may be required in installations where cable trays or conduit runs
include high voltage lines or other sources of induced interference.
Note3: The supply of power must be from an isolating source with over-current protection as
follows:
AWG Over-current Protection AWG Over-current Protection
22 3A 16 10A
20 5A 14 20A
18 7A 12 25A
Table 4 Over-current Protection per AWG
The RS-485 (if applicable) requires 24 gauge, two conductor, shielded, twisted pair cable between sensor and
host PC. Use Belden part number 9841. Two sets of terminals are located on the connector board to facilitate
serial loop wiring from sensor to sensor. Wiring designators are
A & B
(IN) and
A & B
(OUT).