Operating instructions

AMC-DTR Sensor Transmitter User Manual
2
4 INSTALLATION INSTRUCTIONS
4.1 Introduction
Important: This manual describes both the 2-Wire and the 3-Wire 4-20mA versions of the
AMC-DTR. 2-Wire versions are only possible if using an electrochemical sensor and the DTR-
10-0232 Display PCB IS THE ONLY PCB IN THE ENCLOSURE. If the DTR-10-0233 I/O
Power Supply is installed it is a 3-Wire version.
The AMC-DTR is a single or dual channel fixed-point gas monitor designed to provide
continuous monitoring of hazardous gases in the workplace. Monitored values are displayed in
their engineering units as well as graphically as a bar graphs or 30-minute trends (Figure 1).
Input types include Electrochemical toxic / oxygen sensors, catalytic bead combustible sensors,
MOS solid-state sensors, as well as various millivolts, volt and 4-20mA inputs. Sensors supplied
by the factory include an 8-wire Smart Sensor interface capable of configuration data uploads to
the AMC-DTR. Traditional 3-wire Simple sensors, without the smart interface, are also
supported by the AMC-DTR. Its advanced microcontroller electronics and superior graphic LCD
operator interface offers enhanced diagnostics and fault analysis not possible in competing
products. The AMC-DTR Transmitter provides a standard 4-20 mA output signal for connection
to control systems or other alarm instrumentation. Available options include an Alarm Relay /
RS-485-Modbus board or an isolated 4-20mA output. Non-volatile memory retains all
configuration data during power interruptions. The magnetic, non-intrusive calibration can be
easily performed by one person without opening the enclosure. A standard “real time clock &
calendar” feature allows data logging of calibrations and alarm events for recall to the LCD
readout or over the serial port.
A separate PC compatible USB Interface allows a Smart sensor to be loaded with configuration
variables via a PC and upload this data to the AMC-DTR. This includes alarm set points, range,
target gas, calibration constants and other variables required to match the AMC-DTR to a
specific application. For traditional Simple sensors, without the smart interface, the USB
interface allows direct AMC-DTR configuration from a PC.
Electrochemical toxic and oxygen DTR’s are capable of 2-wire 4-20mA operation (section 4.6.1)
when the alarms / modbus option and LCD backlight are not required. Catalytic LEL sensors, or
addition of the DTR-10-0234 Alarms / Modbus option, require the DTR-10-0233 I/O Power
Supply board providing 3-wire 4-20mA operation (section 4.6.2).
Only periodic calibration checks are needed to assure dependable performance. Operator
interface is very intuitive with the LCD displaying data both graphically as bar-graphs / trends
and in engineering units (Figure 1). Additional features include:
• No potentiometer or jumper settings required. All setup is with menus accessed via the LCD
/ magnetic keypad operator interface without opening the enclosure.
• Field adjustable alarm levels may be high, low, fault, fail-safe, latching and
acknowledgeable.
• New alarms cause front LED’s to flash and become steady after acknowledge.
• CAL MODE advises when to apply gas during calibrations
• One half hour trend screen shows rate of change of gas exposures
• Sensor life bar-graph updates after each SPAN calibration.
• Modular design affords efficient installation and plug in sensors allow changing target gases
after installation