XC Spec AQ TstatPro
CO2 sensors are used to control ventilation systems and monitor indoor air quality. They can be stand-alone sensors or integrated into thermostats or air quality monitoring platforms.
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XC Spec AQ TstatPro
Thermostat with integrated CO2 sensor for long term monitoring and demand control ventilation.
Hub Highlights:
- CO2 value displayed on device. Graph of CO2 values over time available on cloud-based interface.
- Connects to XC Spec building automation system. Analog output easily connected to other building automation systems for monitoring or ventilation control.
- Excellent performance on Hub CO2 accuracy testing protocols
- Includes CO2, temperature, and humidity sensors. Uses automatic background calibration.
Last Edited on: 9/9/2025
| Sensor Type | Photoacoustic Manufacturer: Sensirion |
| Power Input | 24 VAC |
| Outputs | Wifi to cloud-based interface |
| Altitude Correction Method | Automatic via pressure sensor |
| Measurement Range | 400-5,000 ppm |
| Reported Accuracy | 400-2,000 ppm: ±50 ppm 2,001-5,000 ppm: ± 40 ppm |
| CO2 Display | On device and web (account required) |
| Uses Automatic Background Calibration (ABC) | Yes |
| Date of Test (including warm-up period if device uses automatic background calibration) | August 19-September 3, 2025 |
| Sample Size | 5 |
|
Error of CO2 measurement @1100 ppm (average) (ppm)
|
44 |
|
Error of CO2 measurement @ 1100 ppm (standard deviation) (ppm)
|
28 |
| Accuracy Category | less than ±75ppm |
|
Noise of CO2 measurement @1100 ppm (Average) (ppm)
|
5 |
|
CO2 Full results
|
See Box Plot |
| Operating Power for Sensor (watts) | 0.70 |
| Operating Power for Gateway (watts) | NA |
|
Operating Power for Sensor + Gateway (watts)
|
0.70 |
| Operating Power Category | less than ±1 W |
| Maximum Number of Sensors per Gateway | NA |
Data Collection
Sample Size
5
Data Source: Staff at the UC Davis Western Cooling Efficiency Center
User interface
1. Can the sensor display the CO2 level to occupants? If yes describe.
Yes - Sensor screen displays live CO2 readings. Historical CO2 data is displayed graphically on XC Spec web portal, account required.
User interface
2. Can the sensor display a visual indicator to occupants that the CO2 level has exceeded a programmed threshold? If yes, describe (what does the indicator look like, what the default thresholds are, and can the threshold be changed).
Yes - Device includes three color LEDs. A green LED lights up when CO2 is below the low setpoint (800 by default). A red LED lights up when CO2 is above the high setpoint (1100 by default). A yellow LED lights up when CO2 is between the low and high setpoints. The low and high setpoints can be configured on a webpage associated with each sensor (must be connected to sensor's local network).
Reporting capabilities
3. Can the sensor alert facilities (such as an email, text, or call phone application) when the CO2 level has exceeded a programmed threshold? If yes, describe (what does the indicator look like and can the threshold be changed).
Yes - Email alerts are configurable on mobile app.
Integration capabilities
4. Can the CO2 sensor interface with a building automation system (BAS) or demand control ventilation (DCV) system controller? If yes, describe if integration capabilities are vendor specific.
Yes - 0-10V or 2-10V DCV output and XC Spec BAS
Integration capabilities
5. If sensor can interface with a BAS or DCV system controller, is additional hardware required?
No
Reporting capabilities, Integration capabilities
6. How can the CO2 sensor data be logged? If proprietary software, describe (what type of account is needed, what logging intervals are available, what does it look like, and describe its capabilities including data download capabilities).
Logged data available through web interface as .csv download. Data logged every 30 seconds. Phone app also allows viewing limited historical data in a table. Max CO2 concentration for the past five occupied periods is available.
Installation
7. Does the sensor require specialized software for installation? If yes, describe.
Yes - Requires logging into a local wifi portal to configure. Proprietary web interface also required to view and download historical data.
Installation
8. Does the sensor require specialized training for installation? If yes, describe.
No
Operation
9. Does the sensor require on-going maintenance? If yes, describe.
No
Operation
10. Does the sensor require service contracts for ongoing data access? If yes, describe.
No
Miscellaneous
11. Are there any other notes about the user experience?
N/A