Field Instruments

General

The AIR4, Air Quality 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-effluence, 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 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 offices, cafeterias, schools, production facilities, apartments and homes in direct comparison to infrared-absorption CO2 sensors.

Features

• Direct correlation to CO2 levels
• High sensitivity and fast response
• Stable long-term operation
• 0 to 2000 ppm CO2 equivalent output signal
• LCD to display air quality information
• Internal menu for easy setup
• Analog stepped output for damper control
• Linear output for logging and control
• Selectable 0-5 or 0-10 Vdc signal
• Tri-color LED to indicate IAQ level
• Optional relay output with adjustable setpoint
• Optional override switch output
• Optional resistive temperature sensors

Specifications

• Make: Greystone
• Model: AIR4110T6S
• Display & LED: viewable LCD & concealed LED
• Sensor 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 rectified)
• Consumption: 35 mA max @ 24 Vdc
• Input Voltage Effect: Negligible over specified operating range
• Protection Circuitry: Reverse voltage protected, over voltage protected
• Operating Conditions: 0 to 50°C (32 to 122°F), 5 to 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: 10,000 Ω minimum
• Programming And Selection: Via internal push-buttons and LCD menu
• Warm-Up Time: 5 minutes
• LCD Resolution: 1 ppm / 1%
• LCD Size: 35mm W x 15mm H (1.4” x 0.6”) alpha-numeric 2 line x 8 characters
• LED Indicator: Tri-color (Good = Green, Fair = Blue, Poor = Red), enable or disable via menu
• Wiring Connections: Screw terminal block (14 to 22 AWG)
• Optional Override Switch: Front panel switch with FET output, 30 Vdc @ 50 mA max
• Relay Output: Form A contact (N.O. or N.C.) 2 Amps @ 140 Vdc, 2 Amps @ 30 VDC (Relay action, trip point and hysteresis set via menu
• Optional Temperature Sensor: 3000 ohm Thermistor
• Options: Manual Override
• Enclosure: Wall mount enclosure, white ABS IP30 (NEMA 1)
• Dimensions: 84mm W x 119mm H x 29mm D (3.3” x 4.7” x 1.15”)
• Country of Origin: Canada

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