RSA-DCTH Carbon Dioxide (CO2) / Temperature/ Humidity Transmitter
Applications & Features
- RSA-DCTH series carbon dioxide (CO2) /temperature/ humidity transmitters are designed for monitoring & controlling indoor air quality, temperature and humidity in one unit
- RSA-DCTH is suitable for wall mount and RSA-DCTHD is suitable for duct mount
- High performance NDIR digital sensor and circuit, ensure precise measurement and temperature compensation
- Multiple optional RTD or thermistor sensors, compatible with a variety of control systems
- Stable, reliable and fast response
- 15 years of CO2 sensor life without maintenance
- All electrical terminals are on the inside bottom, avoid any possible destroy to PCB when wiring(RSA-DCTHW)
- Digital technology applied, multiple outputs optional, over voltage and reverse polarity protection, high reliability and anti-interference capability
- Large LCD with unit indicator(RSA-DCTHW ), display carbon dioxide ( CO2 ), temperature and humidity alternatively
Specifications
Carbon dioxide (CO2 )
Sensor: NDIR sensor, with ABC algorithm*
Sampling Method: diffusion
Accuracy: (40+3%MV) ppm
Response time: <10s (30cc/min, low airflow)
Drift: <±10ppm/year
Range: 0~2000ppm (measure range 400~2000ppm)
Output: 4~20mA, 0~10V, RS485/Modbus
Temperature
Sensor: Digital, RTD or thermistor, see models
Range: 0~50°C
Accuracy: see accuracy table
Output: 4~20mA, 0~10V, RS485/Modbus or RTD / thermistor
Relative Humidity Sensor: Digital polymer
Range: 0~100%RH
Accuracy: see accuracy table
Hysteresis: <±1%RH
Response time: <10s (25°C, in slow air)
Drift: <±0.5%RH/year
Output: 4~20mA, 0~10V, RS485/Modbus
Power supply: 16~28VAC/16~35VDC
Load resistance: ≤500Ω (Current output), ≥2kΩ (Voltage output)
Display: Optional LCD Display (RSA-DCTHA)
Display resolution: 1ppm, 0.1°C, 0.1%RH
Working environment: 0~50°C, 0~95%RH (Non-cond.)
Temp. compensation: 0~50°C
Storage temperature: -20~60°C
Housing material: ABS+PC (RSA-DCTHA), fireproof ABS (RSA-DCTHD)
Protection: IP30 (RSA-DCTHW), IP65 (RSA-DCTHD)
Weight: 175g (RSA-DCTHW), 416g (RSA-DCTHD)
Approval: CE
*ABC algorithm: Automatic Baseline Correction, it constantly keeps track of the sensor's lowest reading over a few days interval and slowly corrects for any long term drift detected as compared to the expected fresh air value of 400 ppm CO2.
Models
- All products are factory set to 4~20mA as output default, and can be set to 0-10V by jumper on the PCB.
- See resistance table on page 1 of this catalog.
Accuracy table for temperature/ humidity
When select RTD/ thermistor, RSA-DCTHA’s total error will be 0.5°C more than the accuracy in the models while RSA-DCTHD’s total error is the same as in the models.
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