Greystone Energy Systems AIR4 Series Catalog Page
AIR QUALITY
CONTROLLER-MONITOR
AIR4 Series
Precision air quality
control / sensing
FEATURES:
• True Air Quality Monitor
• Microprocessor based controller
• Linear and stepped analog output
• Optional relay output
• Optional temperature sensor
• LCD Display
Peace of mind
through reliable
gas monitoring
GREYSTONE HAS AN ISO 9001 REGISTERED QUALITY SYSTEM
OPERATION
The AIR4, Indoor Air Quality (IAQ) Sensor uses an advanced MEMS metal oxide
semiconductor sensor to detect poor air quality. The sensor reacts quickly to detect a
broad range of VOCs such as smoke, cooking odors, bio-euence, outdoor pollutants
and from human activities. The sensor captures all VOC emissions that are completely
invisible to CO2 sensors.
Extensive studies and research have shown that there is direct correlation between CO2
levels and VOC levels and the Air Quality Sensor has been calibrated to provide a
"CO2-equivalent" ppm measurement value, thereby achieving full compatibility to
existing HVAC CO2 ventilation standards. The sensor also includes control algorithms
that correct sensor drift and aging and therefore provides a long-term consistent DCV
solution while overcoming the deciencies of CO2 measurement by detecting the true
root-cause of ventilation demand, VOCs. The IAQ sensor emulates the human perception
of air quality much more than a CO2 sensor and even detects odorless, potentially
hazardous substances such as carbon monoxide.
The CO2-equivalent sensor output value was developed over a period of several years to
allow the IAQ sensor to be optimized for Demand Controlled Ventilation applications.
The long-term IAQ sensor performance was monitored in various locations including
oces, cafeterias, schools, production facilities, apartments and homes in direct comparison to infrared-absorption CO2
sensors. The data shows consistent results between measured CO2 values and the IAQ CO2-equivalent values and also
highlight the poor air quality events detected by the IAQ sensor that the CO2 sensor misses. The above sample chart shows
CO2 measurements vs. IAQ measurements.
Typical Indoor Air VOC Contaminants
Contamination Source
Human Being
Oce Equipment
Building Material
Furniture
Consumer Products
SPECIFICATION:
Sensing Technology......................................................... MEMS metal oxide semiconductor VOC sensor
Measurement Range........................................................ 450-2000 ppm CO2 equivalent or 0-100% (menu selectable)
Drift Compensation..........................................................Automatic baseline correction
Power Supply ..................................................................... 20-28 Vac/dc (non-isolated half-wave rectied)
Consumption......................................................................35 mA max @ 24 Vdc
Input Voltage Eect .........................................................Negligible over specied operating range
Protection Circuitry...........................................................Reverse voltage protected, over voltage protected
Operating Conditions......................................................0-50 °C (32-122 °F), 5-95 %RH non-condensing
Linear Output Signal........................................................ 0-5 / 0-10 Vdc (menu selectable) = 0-2000 ppm CO2 equivalent
Analog Stepped Output Signal....................................Three steps representing Good, Fair and Poor air quality
(each step is independently adjustable from 0-10 Vdc)
Output Drive Capability.................................................. 10 KΩ minimum
Programming and Selection ......................................... Via internal push-buttons and LCD menu
Warm-up Time.................................................................... 5 minutes
LCD Resolution................................................................... 1 ppm / 1 %
LCD Size ................................................................................ 1.4” w x 0.6” h (35 x 15 mm) alpha-numeric 2 line x 8 characters
LCD Backlight...................................................................... Enable or disable via menu
LED Display (Room Only)................................................ Tri-color (Good = Green, Fair = Blue, Poor = Red), enable or disable via menu
Wiring Connections.......................................................... Screw terminal blocks (14 to 22 AWG)
Enclosure..............................................................................Room: White ABS, IP30 (NEMA 1)
Duct: Grey ABS, UL94-5VB, IP65 (NEMA 4X)
Dimensions.......................................................................... Room: 84 w x 119 h x 29 d mm (3.3”w x 4.7”h x 1.15”d)
Duct: 145 w x 100 h x 63 d mm (5.7”w x 3.95”h x 2.5”d)
Duct Probe: 177 long x 25.4 Diameter mm (7”l x 1” d)
Weight...................................................................................Room: 122 gm (4.3 oz) Duct: 290 gm (10.2 oz)
Override Switch (Room only)........................................Front panel switch with FET output, 30 Vdc @ 50 mA max
Relay Output ....................................................................... Optional on Room, Standard on Duct
Form A contact (N.O. or N.C.) 2 Amps @ 140 Vac, 2 Amps @ 30 Vdc
(Relay action, trip point and hysteresis set via menu)
Optional Temperature Sensor.......................................Various thermistors and RTDs, 2-wire resistive output
Emission Source
Breath
Respiration and Perspiration
Skin
Flatus
smetics
Co
Household Supplies
Combustion
Printers, Copiers, Computers
Paint, Adhesive, Solvent, Carpet
PVC (Poly Vinyl Chloride)
VOCs
Acetone, Ethanol, Isoprene
Nonanal, Decanal, α-Pinene
Methane, Hydrogen
Limonene, Eucalyptol
Alcohols, Esters, Limonene
Unburnt Hydrocarbons
Benzene, Styrene, Phenole
Formaldehyde, Alkanes, Aldehydes, Ketones
Toluene, Xylene, Decane
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