16
A100b
JAN 2009
KEY FEATURES−GAS ALERT SYSTEM
Provides local display and alarm based on
•
measured target gas level
Visual alarm, Amber LED light
•
Audible alarm (mutable)
•
Power indicator, Green
•
Numeric PPM reading
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Bright LED display
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Shipped factor y calibrated and tested
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TECHNICAL SPECIFICATIONS
Operating Temperature Range: -10ºF (-23ºC) to
125ºF (50ºC)
Humidity Range (Non-condensing): 0-95%
Voltage Requirements: 24V AC/DC, 50/60 Hz
Display: LED, Red
Loop Resistance: 100 ohms
Power Requirements at 24V AC, 50/60Hz with sensor:
11.4VA
Power Requirements at 24V DC with sensor: 247mA
Audible Alarm Sound Pressure: 97dB at 2 feet
Tone Type: Continuous, 2900 Hz
Muted Sound Pressure: 60dB at 2 feet
Visual Alarm, LED Lamp: Amber, 38 lumens
Enclosure: Water tight, NEMA4X (IP65)
INSTALLATION OF GAS ALERT SYSTEM
The GAS Alert System is shipped factory calibrated and
tested; ready to use. Mount in a location safe and easily
accessible. Avoid thermal extremes and areas where
falling water or condensation moisture is present.
The GAS Aler t System can be mounted to any solid flat
surface. Two options are available for mounting; screw
the base to a solid flat sur face or clip-on to a DIN-rail.
The lower cover must be removed to access the two
mounting holes for screw mounting. Attach to the wall
with the appropriate mounting screws. Replace the
cover when complete.
WIRING GAS ALERT SYSTEM
The GAS Aler t System can be used as a standalone,
locally monitored system or as par t of a larger gas
monitoring and signaling system. The lower cover to
the terminal compar tment must be removed to gain
access for wiring. Knockouts are available for ¼˝ and
½˝ conduit or liquid tight cable clamps. To use as a
standalone system one gas sensor is required. The
gas sensor is powered via the GAS Aler t System. The
gas sensor 4-20mA signal is fed back to the GAS Aler t
System to allow for a numeric readout of the actual
PPM value measured. The gas sensor internal relay is
wired to the GAS Aler t System to trigger the signaling
lamp and sounder. The GAS Aler t System signal lamp
and sounder will clear when the gas level as detected
by the gas sensor drops below the adjusted trip point.
The default setting from the factor y for a specified gas
sensor is half the total range. For typical wiring refer
to page 17.
To use as par t of a larger gas monitoring and signaling
system, each GAS Aler t System will be mated with a
gas sensor. The 4-20mA signal can be used to drive
the GAS Aler t System device, plus a larger monitoring
system or PLC monitoring signaling system. For typical
wiring refer to Fig. I.
GAS Alert System
