Sensor Type" And Amc-Dtr Signal Conditioning - AMC -DTR Installation And Operation Instructions Manual

4.10 "Sensor Type" and AMC-DTR Signal Conditioning

Catalytic bead and electrochemical sensors obviously have different signal conditioning
requirements. In addition, same sensor types have different response coefficients, signal
strength and gain and offset requirements. The block / wiring diagram in Figure 14 illustrates
how AMC-DTR's are able to accept many sensor types without the need of manual
potentiometers or jumpers. Smart Sensors carry this setup information with each sensor.
3-Wires
Reference
"Simple" Catalytic-
Bead LEL Sensor
Active
Or
8-Wires
Reference
Active
"Smart" Catalytic-
Bead LEL Sensor
3-Wires
Sense
"Simple" Electro-
Reference
chemical Sensor
Counter
Or
8-Wires
Sense
Reference
Counter
"Smart" Electro-
chemical Sensor
Figure 14: AMC-DTR Block / Wiring Diagram
AMC-DTR Sensor Transmitter User Manual
Sensor Excitation
Switching Power
I/O Power
Supply Board
TB1
1
2
3
I/O Power
Supply Board
S1
2
3
4
6
Memory
Device
7
1
8
Display Assembly
TB2
1
2
3
Display Assembly
S1
2
3
4
6
Memory
Device
7
1
8
"Sensor Volts"
Digital Pot
"Balance Adjust"
Supply
Digital Pot
Bridge
Amplifier
Analog Switch
(Display Assy)
"Smart" Sensor
Serial Interface
+Vdd
Common
"PreAmp Gain Adjust"
Digital Pots
uAmp / V
Amplifier
"Smart" Sensor
Serial Interface
+Vdd
Common
15
Catalyitc Bead
Bridge Amplifier
(I/O Power Supply)
Ribbon cable
between I/O
& Display Assy.
Analog / Digital
Converter
(Display Assy)
Electrochemical
Sensor Amplifier
(Display Assy)