Operating instructions

AMC-DTR Sensor Transmitter User Manual
6
4.5 System Design Specifications
Supply Voltage:
10 to 30 volts
Power Consumption:
• Catalytic Combustible Sensors (requires DTR-10-0233 I/O Power Supply and 3-wire operation):
100 mA @ nominal 24 VDC
• Toxic/Oxygen Sensors without Relays / Modbus Option (2-wire 4-20mA operation): 25 mA
@ nominal 24 VDC.
• Relays / RS-485 Modbus Option Board (requires DTR-10-0233 I/O Power Supply and 3-wire
operation): 40 mA per relay (120 mA total with all 3 energized); RS-485 use adds 20mA
Memory:
Non-volatile E2 memory retains configuration values in the event of power outages.
Loop Resistance at nominal 24 VDC power:
650 ohms maximum in 2-wire mode
750 ohms maximum in 3-wire mode.
Relays (Optional):
Three configurable form C (SPDT) relays rated for 5 amp at 30 VDC or 250VAC RESISTIVE.
Relay 1 and Relay 2 level alarms are configurable for HIGH or LOW trip, for normally energized
(Failsafe) or normally de-energized and for latching or non-latching.
Relay 3 is always normally energized for failsafe operation so loss of power to the AMC-DTR
will be indicated as a “FAULT” condition. Relay 3 is always non-latching.
CAUTION:
Relays are rated for RESISTIVE loads. Inductive loads, such contactor coils or motors may
cause contact arcing, which emits RFI into the sensor signals. Use appropriate snubbers and
MOV’s across inductive loads and keep wiring away from signal wires.
4.6 Field Wiring Installation
Maximum Field Wiring Lengths
Maximum wiring run
with 250 Ohm Load
Maximum wiring
run with 250 Ohm
Load
Supply 10-32VDC Current@24VDC
18AWG 20AWG
Max Curent
with DTR-10-
0234 Option
@24VDC
18AWG 20AWG
DTR-EC 20mA 36000ft 23000ft 190mA 4850ft 3050ft
DTR-CAT
100mA
9200ft 5797ft 270mA 3400ft 2100ft
DTR-DS 120mA 7680ft 4830ft 290mA 3100ft 2000ft
DTR-ST 400mA 2340ft 1449ft 570mA 1600ft 1000ft
DTR-10-0234 option
includes three 5 AMP
Alarm Relays and RS-485
Modbus
For other field wiring setups, contact the factory for further information. Note when using
modbus communication feature total wire loops should not exceed 1000ft/300M remote power
supplies may be necessary for some configurations to ensure a minimum of 10VDC.