SenSmart 3000 User's Manual
Document: UM-1003
Revision Level B
11
Figure 2-7: RS-485 Modbus Wiring
2.10 Isolated 4-20mA Output 10-0250 Option
Description:
The optional 10-0250 Isolated 4-20mA option (Figure 2-8) provides dual 4-20mA outputs that are
electrically isolated from sensor inputs and the 24 VDC power source. Each 4-20mA output
share the same common terminal and are not isolated from each other. This board is
“piggybacked” behind the 10-0232 Display Assembly (Figure 2-3). Addition of this option requires
4-wire mode 4-20mA operation and thereby requires the I/O Power Supply board (Figure 2-5).
U8
TB1
P1
FUSE
Assy: 10-0250
1
2
3
4
-
+
-
+
Isolated 4-20mA Output Option
1/2A
Figure 2-8: 10-0250 Isolated 4-20mA Output Option
2.11 Sensor Installation (with Smart / Simple Sensor Definition)
Many manufacturers offer industry standard electrochemical and catalytic bead sensors for toxic /
oxygen and LEL combustible gas detection. These are referred to as
Simple
sensors in this
manual. The SenSmart 3000 design accommodates users wishing to continue use of their
existing simple sensors by accepting electrochemical types into TB2 of the 10-0232 Display
Assembly or catalytic bead types into TB1 of the 10-0233 I/O Power Supply (mounted to the
bottom of the enclosure). The SenSmart 3000
Smart Sensor
interface also uses proven
electrochemical technology for toxic / oxygen and catalytic bead for LEL combustibles BUT has
