Overview

The Wireless CO2 Sensor (RCT) uses wireless technology to communicate accurate indoor CO2, temperature, and relative humidity readings to compatible controllers or gateways.The RCT sensor is designed for commercial facilities where indoor environmental quality is of concern and potential savings from utilizing CO2 based demand controlled ventilation is desired. The sensor is equipped with a solar panel that harvests light energy from natural or artificial light sources. Excess energy is stored for use in periods of darkness allowing the sensor to operate for as long as 75 hours with no light. A CR2032 battery is installed for calibration purposes or to provide backup power for up to five years in continued low light applications.

The RCT incorporates Echoflex’s latest diagnostic and configuration features to ensure calibrated CO2 values, wireless range and solar harvesting capability. At the push of a button, the RCT sensor can indicate current CO2 levels via three colored LEDs. Simple button press and hold sequences can display solar energy harvesting performance and Echoflex’s Range Confirmation technology will indicate radio signal strength.

Sensor status updates are dynamically controlled driven by power management logic that determines the messaging rate to ensure consistent and timely updates. Further control logic monitors quick changes in data values and can push immediate sensor updates to linked receivers.

An on-board absolute pressure sensor provides correction for CO2 readings when at higher altitudes ensuring accuracy with each reading. CO2 calibration can be initiated manually or as an automatic self-calibration routine.

The Echoflex RCT sensor works with many gateways from common BEMS manufacturers to provide explicit, accurate, and timely monitoring of a facility’s interior spaces.

Features

• Solar powered, wireless CO2, temperature and relative humidity sensor
• Wall mount with removable back plate
• Easily calibrated in ambient air
• Integrated self-calibration feature eliminates maintenance
• Built-in absolute pressure sensor corrects CO2 reading for altitude
• Integrated solar harvesting energy level via LED indication
• Integrated Range Confirmation via LED indication
• Reliable radio reception range of 24 m (80 ft) – commercial office spaces (typical), up to 100 m (330 ft) line of sight
• Smart power management logic manages sampling and message transmission based on real time ambient light levels
• Current CO2 level can be displayed at sensor via LED indication
• CR2032 Coin cell battery included for low light conditions
• Operates in light conditions as low as 5 foot candles (50 lux)

Specifications

Carbon Dioxide Sensing

• Measurement range: 0–2,000 ppm
• Technology: Ultra low power, LED-based NDIR
• Accuracy: ± 50 ppm with resolution of 10 ppm
• Altitude/pressure compensation: Built-in correction
• Self-calibration: Automatic background calibration (ABC)

Temperature Sensing

• Sensing range: 0°C to 51°C (32°F to 124°F)
• Accuracy: ± 0.5°C (± 0.3°C)
• Resolution: 0.2°C (0.36°F)

Relative Humidity

• Sensing range: 0%–100% RH range
• Accuracy: ±3% RH at 10%–90%, ±7% at 0%–10% and 90%–100%
• Resolution: 0.5%

Power Supply

• Operational light level: 5 foot candles (50 lux)
• Minimum charge for operation: 10 minutes at 18.5 foot candles (200 lux)
• Charging light level: 18.5 foot candles (200 lux)
• Maintain charge time: 18.5 foot candles (200 lux) for 6 hours
• Maximum charge time: 16 hours at 18.5 foot candles (200 lux)
• Operating life at full charge: 75 hours at 0 lux
• Battery: CR2032 coin cell

I/O Information

• Inputs: Link button, Test button
• Outputs: LEDs - red, green and blue

Communications

• Radio frequency: 902 MHz(U) or 868 MHz(Y)
• Antenna: Integrated whip
• Transmission range: 24 m (80 ft) - commercial office spaces (typical), up to 100 m (330 ft) line of sight

Mechanical

• Operating temperature: -25°C to 50°C (-13°F to 122°F)
• Weight: 115 g (4 oz)
• Dimensions: 135x72x24 mm (5.3x2.8x0.9 in)
• Mounting: Screws or double-sided tape (not included)

Regulatory and Compliance

• 902 MHz model: FCC Part 15.231, Remote Control Transmitter, IC RSS-210, RoHs compliant
• 868 MHz model: CE Mark, RoHs compliant