User manual

Model: EC-GOLD
ECGOLDUM17.DOC Rev: 1.7
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1.0 INSTRUMENT OVERVIEW
1.1 FEATURES
• Single gas transmitter for a large variety of gas types.
• Carbon Monoxide sensor has expected life of 5 years min. (3 year guarantee)
• Other sensors have expected life of 2 years (1 year guarantee)
• Carbon Monoxide sensor has self test feature: periodic & on demand.
• Output may be user selectable for analog (4-20mA / 2-10V) or Arjay’s Discrete Voltage Output
(DVO).
• Convenient pushbutton calibration.
• User selectable for Single or Dual Point calibration
• High, Low, and System Fault indication
• User selectable High and Low Alarm levels
• Modbus protocol via RS-485 for access by Arjay/Enmet Central Access Panel or compatible
system
• User specified custom features may be added by contacting Arjay Engineering Ltd.
1.2 DESCRIPTION
The EC-Gold transmitter may be used to sense a large variety of gases including CO, NO
2
, Ammonia,
Chlorine, and Hydrogen Sulfide (H
2
S).
The Carbon Monoxide sensor offers a unique self-test feature, which may be activated either via the
onboard Push To Test pushbutton, or remotely via the Arjay/Enmet Central Access Panel.
The analog output may be field configured either as a 4-20mA / 2-10V output or as an Arjay/Enmet
Discrete Voltage Output (DVO). The DVO is a 4 level output: 0V = ok, Low Alarm = 1.8V, High Alarm =
2.8V, Sensor Fault = 10V. The DVO is a common signaling method: any sensor in a zone triggers the
corresponding Low, High or Sensor Fault alarm at the Arjay/Enmet ISA-66RLU alarm panel.
In Discrete Voltage Output mode, the transmitter may be connected as part of a zone connected to an
Arjay/Enmet ISA-66RLU zone system. In Analog mode, the transmitter puts out a 4-20mA output
proportional to the adjustable Span value.
Independent of the output type selected, the transmitter may also be accessed by an Arjay/Enmet Central
Access Panel (modbus protocol) to form part of a networked gas monitoring system where up to 128
transmitters may be linked on a 2-wire RS485 connection. The networked approach allows more
complex control strategies based on the gas concentrations of a number of transmitters.
Figure 1.0
BLOCK.DSF
UP TO 128 TRANSMITTERS ON THE NETWORK
4-20mA
or
Enmet RLU output
2 Wire RS-485 Network
Alarm LED's
Vents
Sensor access for calibration
Depending on sensor, access is
either from bottom or front.
Push to test
pushbutton (from bottom)
Calibration / Config
pushbutton (from bottom)
2 Wire
24VDC
ENMET EC-GOLD
CENTRAL ACCESS PANEL
(CAP)
EC-GOLD NETWORK APPLICATION