Features: 
1) Famous American NDIR CO2 module inside with 15 years long life. Its detection

  
    range is 0 - 2,000ppm. Up to 0 - 50,000ppm can be selected
2) ABC logic with patented self calibration algorithm makes users use it for 15 years

    without calibration amending 
3) Real-time detecting of CO2 concentration as well as temperature, and can be 
    preset three indication values 
4) 3-LED indication reflecting software selectable ppm range: optimal ventilation;

    moderate ventilation and insufficient ventilation
5) Optional humidity detection and display
6) Optional 1X dry contact output to control the ventilation device
7) Optional RS485 interface to connect to PC for remote controlling 
8) Especially for schools, kindergartens, official buildings, conference rooms, rest

    rooms as well as other public places

Features:
1) Non-Dispersive Infrared Detector (NDIR) with 15 years' lifetime 
2) Famous American Telaire CO2 sensor is inside and its 
    detection range is up to 0~50,000ppm
3) Real-time detecting of indoor CO2, temperature, and humidity
4) LCD displaying of CO2 concentration with temperature and 
    Humidity (option) at the same time
5) Also as transmitter of CO2 or as the controller of 
    CO2 or temperature and humidity
6) ABC Logic with patented self calibration algorithm makes users use it for 
    15 years without calibration amending
7) RS-485 communication interface makes the CO2 multiple 
     monitor can be connected with remote PC
8) Microprocessor control
9) Providing 0~10V analog signal and relay dry-contact output   
10) Analog output with two alternatives: linearized over full range output or 
      PID control output
11) Optional on board relay with field adjustable trip point according to 
      CO2, temperature or humidity (programmable selection)
12) Quick response
13) CE approved

Features:
1) VAV proportional-action control thermostat 
2) One continuous output of DC 0 ~ 10V output to control air damper and one 
    or two on/off contact outputs to control one or two stages electrified heating


3) Up to 2 stage energizing: selecting one or two stage energizing makes 
    temperature controlling more accurate and much saving-energy
4) LCD display: display of working status such as room temperature, set point, 
    damper and electric heating status, making reading and operating easy and 
    accurate
5) Selectable temperature displaying scale C/F 
6) PC/ABS top-grade housing
7) Temperature sensor can be external (optional)
8) Infrared remote control (optional)
9) 12 hours timer of turning off (optional)
10) RS485 communication interface selectable (special use)

Features:
1) Real time monitoring of CO level with range from 0 to 1,000ppm
2) LCD can display CO, temperature and humidity at the same time
3) Full time monitoring of CO level, even the slightest leak can be detected
4) Not only works as transmitter of CO, but also works as the controller of CO
5) Provides from 0 to 10V analog signal and 2 relay dry contact outputs
6) Analog output with two alternatives: linearized over full range output or PID

    control output
7) Preset the first and second CO alarm points
8) Semiconductor sensor technology with long lifetime
9) RS485 communication interface, 15kV antistatic protection, independent address

    setup
10) PC / ABS top grade flame retardant housing
11) Installation standard: 65mm x 65mm or 2 inches x 4 inches wire box
12) Used to monitor CO level 
13) Also used for room temperature and humidity detection