Model TA-A8041/42-D

CO2 MEASUREMENT

GS Series

TA-A8041/42-D

Analog Output Duct Mounted CO2 Sensor

Non-Dispersive Infra-Red (NDIR) CO2 Measurement with ABC Logic

The TA-A8041-D and TA-8042-D CO2 sensors are designed to be mounted through the side 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
  • Demonstrate compliance with ASHRAE Standards 62.1, 90.1 and 189.1
  • Satisfy LEED requirements
  • Maintain acceptable indoor air quality
  • Save energy
Overview PDF

Description

FEATURES

  • NDIR CO2 sensing technology
  • 0 to 2,000 ppm range
  • ABC logic ensures long-term calibration stability
  • 0-10 VDC output
  • Insertion probe design
  • 4 inch (8041) and 8 inch (8042) probe lengths available
  • 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-A8041-D and TA-8042-D CO2 sensors are designed to be mounted through the side 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 CO2 demand 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: ±30 ppm plus 3% of reading, @72° F [22°C]

Temperature Dependence: 0.36% FS/°F [0.2% FS/°C]

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

Stability: <2% of FS over life of sensor (10 year typical)

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


NETWORK CONNECTIONS


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

Probe Length

TA-A8041-D: 4.09 in. [103.8 mm]

TA-A8042-D: 8.07 in. [205.1 mm]

Junction Box: 3.05H x 3.05W x 1.58D in. [74.6 x 74.6 x 4.02 mm]

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