Principle: ACD3100 is based on the non - dispersive infrared (NDIR) principle to detect the carbon dioxide concentration in the air. It is designed based on the spectral absorption principle of CO₂ gas. The sensor consists of three parts: a light source, a gas chamber, and an infrared receiver. When CO₂ flows into the gas chamber through the gas inlet and out through the gas outlet, it will absorb infrared light of a specific wavelength in the gas chamber. The change in CO₂ concentration will affect the infrared absorption amount, and then the infrared receiver will receive a light source signal of different intensities. The sensor calculates the CO₂ concentration by detecting the absorbance of infrared light of a specific wavelength.
Features: It has excellent selectivity, no oxygen dependence, and a long - service life. It integrates integrated infrared absorption gas detection technology, a precise optical path design, and a high - precision dual - channel signal detection circuit to ensure the accuracy and reliability of the measurement results. In addition, it is equipped with a digital interface output, which provides users with a convenient data reading and interaction experience.
Applications: It is widely used in many fields such as air quality monitoring, fresh - air systems, air - purification equipment, and HVAC equipment.

ACD3100 Video Decoder:

Basic Information: It is a single - channel video decoder produced by ACTi, with the model number ACD - 3100.
Technical Parameters
- Video Resolution and Frame Rate: It supports full D1 resolution, with a frame rate of 25/30 fps (30 fps at 720×480 for NTSC, and 25 fps at 720×576 for PAL).
- Compression Format: It supports MPEG - 4 SP and ASP decompression.
- Audio Function: It has two - way audio function, with a 3.5 mm phone jack for audio input and two - way audio line output.
- Other Interfaces: It is equipped with serial ports for PTZ control panel, and has digital input and output functions. The communication ports include RS - 232, RS - 422, and RS - 485.
- Network Protocols: It supports a variety of network protocols, such as ARP, Bonjour, DDNS, DHCP, DNS, FTP, HTTP, HTTPS, ICMP, IGMP, NTP, PPPoE, RTP, RTSP, SMTP, SNMP, TCP, UDP, and UPNP.
- Ethernet Interface: It has an Ethernet (10/100 Base - T) interface, with an RJ - 45 connector.
Applicable Operating Systems: It is applicable to Windows 7, Windows Vista, Windows Server 2003, and Windows XP operating systems.

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