CO2 MEASUREMENT

GreenSens GS and TA Series
TA-A8031
Analog Output In-duct CO2 Sensor for Compatible GreenTrol Controllers
TA-A8031-D-CO2-Sensor

CO2 MEASUREMENT

GreenSens GS and TA Series
TA-A8031
Analog Output In-duct CO2 Sensor for Compatible GreenTrol Controllers

The TA-A8031-D CO2 sensor is designed to be mounted inside of a duct or plenum.  The sensor is typically mounted in the return air duct or plenum near or at the air handler prior to the introduction of outdoor air.  The sensor outputs a 0-10 VDC signal for CO2 and is compatible with any GreenTrol controller that accepts an analog output CO2 sensor.

Use with GreenTrol outdoor airflow controllers to provide advanced CO2-DCV or ASHRAE 62.1 compliant population-based DCV

ASHRAE 62.1 compliant population-based DCV

Demonstrate compliance with ASHRAE Standards 62.1, 90.1 and 189.1

Satisfy LEED requirements

Maintain acceptable indoor air quality

Save energy

Features

NDIR CO2 sensing technology

0 to 2,000 ppm range

ABC logic ensures long-term calibration stability

0-10 VDC output

Small footprint

Install in ducts or in plenums

Compatible with all GreenTrol application specific controllers that accept an analog input from a CO2 sensor

Connects directly to the power input terminals of compatible GreenTrol application controllers

Overview

The TA-A8031-D is a small footprint, low cost, CO2 sensor designed to be mounted inside of a duct or plenum.

The sensor is typically mounted in the return air duct or plenum near or at the air handler prior to the introduction of outdoor air.

When combined with a GreenTrol outdoor air controller, this CO2 sensor can be used to improve traditional CO2demand control ventilation by using a unique control algorithm that resets the outdoor air setpoint between user defined upper and lower airflow limits (not damper positions) to maintain the space CO2 level. This control method eliminates the under- and overventilation that is prevalent with traditional CO2-DCV.

An even more advanced control method uses the measured airflow rate and CO2 level to estimate the population and calculates the required outdoor airflow, thus meeting the actual requirements of ASHRAE Standard 62.1.

ABC logic ensures years of calibration free operation in applications where the population goes to near zero during unoccupied periods.

Functionality

CO2 Measurement: Provides the CO2 level to the analog input of a GreenTrol application controller that accepts an analog CO2 sensor input

CO2 Sensor

Technology: Telaire Non Dispersive Infrared (NDIR)

Range: 0 to 2,000 ppm

Required Duct Air Velocity: 0 to 1,500 FPM [7.62 m/s]

Accuracy: ±40 ppm + 3% of reading, @72° F [22°C]

Non-linearity: <1% of full scale

Pressure Dependence: 0.33% of reading per 0.1 in. [2.54 mm] Hg

Response Time: <3 minutes for 90% step change typical

Warmup Time: 2 minutes operational, 10 minutes to achieve maximum accuracy

Analog Output

AO1

Assignment: Linear CO2 output signal

Range: 0-10VDC

Environmental Limits, Power Requirements & Dimensions

Environmental Limits

Temperature: 32 to 122 ⁰F [0 to 50 ⁰C]

Humidity: 5 to 95%

Power Requirement: 24 VAC (22.8 to 26.4 under load) @1.65V-A

Flammability Classification: UL-94V-5

Dimensions: 3.83H x 0.74W x 0.94D in. [18.7 x 29.7 x 23.8 mm]

Related Documents

GreenTrol Automation

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