18
A100g
JULY 2017
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
• Bright LED display
• Shipped factory calibrated and tested
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: Watertight, NEMA4X (IP65)
Pollution Degree: 4
True Altitude: 2000M
Installation Category: 1
Duty Cycle: 100%
Equipment Class: 3
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 Alert System can be mounted to any solid flat
surface. See installation dimensions on page 17. Two
options are available for mounting; screw the base to a
solid flat surface 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 Alert System can be used as a standalone,
locally monitored system or as part of a larger gas
monitoring and signaling system. The lower cover to
the terminal compartment 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 Alert System. The
gas sensor 4-20mA signal is fed back to the GAS Alert
System to allow for a numeric readout of the actual
PPM value measured. The gas sensor internal relay is
wired to the GAS Alert System to trigger the signaling
lamp and sounder. The GAS Alert 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 factory for a specified gas
sensor is half the total range. For typical wiring refer
to page 19.
To use as part of a larger gas monitoring and signaling
system, each GAS Alert System will be mated with a
gas sensor. The 4-20mA signal can be used to drive
the GAS Alert System device, plus a larger monitoring
system or PLC monitoring signaling system. For typical
wiring refer to Fig. 19.
Due to system irregulaties the Gas Alert System LED
display, when connected to a gas sensor with no target
gas present, the display may not read at zero. If this is
not acceptable, the user can adjust the LED display in
the Gas Alert System or adjust the zero setting in the
gas sensor. Refer to pages 9 and 10 for adjusting the
gas sensor zero setting.
To adjust the Gas Alert System LED display, open
the clear cover and remove the LED display panel by
removing the 4 screws. On the backside of the LED
display, adjust the potentiometer labeled Z until the
display reads 0 PPM. Reverse procedure to assemble.
GAS Alert System
