Parameters and catalogs

Detector type	Stationary
Equipment	Siren 85dB, LED
IP Rating	IP 65
Output signal	ModBus RS485, 3x SPDT relay, 2x Analogue output 4-20mA
Power Supply	14...36 VDC
Type of gas	CO2 - Carbon dioxide
Weight	0.50 kg

E2639-CO2-40K is a detector designed for monitoring high concentrations of carbon dioxide in the air. The device is equipped with a temperature-compensated sensor that ensures reliable detection and stable measurement, and it is housed in a wall-mounted enclosure with IP65 protection. The E2639 features three SPDT relays with a maximum load of 250 VAC 5 A. Two relays are used for so-called two-stage detection. The third relay indicates a sensor fault. Communication with higher-level systems is provided by an RS485 Modbus RTU digital interface, complemented by two 4–20 mA analogue outputs. In addition, the device includes four LEDs and an audible alarm, which immediately alert operators to any exceeded limit directly at the installation site – without the need to monitor a remote control system.

Typical applications

The E2639-CO2 detector is intended for monitoring carbon dioxide in industrial, commercial and public environments such as breweries, wine cellars and fermentation facilities, server rooms with CO2 fire suppression systems, restaurants and bars with draught dispensing equipment, dry ice storage areas, and other spaces where this gas may accumulate.

Carbon dioxide (CO₂)

Carbon dioxide is a colourless, odourless gas that occurs naturally in the atmosphere and is also a by-product of a wide range of industrial processes such as fermentation, combustion and beverage production. Because it is denser than air, CO2 accumulates near the floor and in low-lying areas, making it an insidious hazard – its presence cannot be detected by human senses. At higher concentrations, it causes dizziness, unconsciousness and, in extreme cases, death by asphyxiation.

Smart communication – ideal for fire alarm systems

The E2639 detector combines the advantages of an autonomous safety device and an intelligent communication node. It is designed for seamless integration with fire alarm systems (EPS) and offers a wide range of outputs for comprehensive control:

Autonomy: 3× volt-free SPDT relays for direct control of equipment or safe system shutdown.
Connectivity: Dual RS485 Modbus RTU interface for real-time digital export of measured data to a higher-level system (BMS).
Control: 2× 4–20 mA analogue outputs intended for precise control of the ventilation frequency inverter.

Easy installation

The E2639 is equipped with three M20 cable glands and a dual terminal block for Modbus RTU. The duplicated Modbus RTU terminals simplify and speed up bus wiring for connection to a higher-level system. No more inserting two conductors into a single terminal. Thanks to the M20 glands, all required outputs can be connected conveniently.

Factory settings:

Measurement range: 0...40,000 ppm
ALARM1 (RE1): 10,000 ppm
ALARM2 (RE2): 20,000 ppm
ALARM3 (RE3): sensor fault
- Automatic alarm reset after ventilation

Analogue outputs: 4-20mA = 0...40,000 ppm
Modbus RTU address: Baud rate 9600, Parity None, Stop bits 1, Slave ID 1

Key features

Sensor type: Photoacoustic NDIR detector
Measurement range: 0...40,000 ppm
Resolution: 10 ppm
T60 response time: approx. 60 s
Recommended recalibration interval: 6–12 months
Estimated sensor lifetime: 10 years
1-year warranty on the sensor itself (2 years on the complete device excluding the sensor)

Calibration certificate

Each detector package includes the manufacturer’s original calibration certificate in English, confirming the accuracy and correctness of measurement at the time of manufacture.

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Smart Gas Detector for Carbon Dioxide EVIKON E2639-CO2-40K