CM101 Series Carbon Monoxide Sensor

Overview of CM101 Series CO Gas Concentration Sensor

The CM101 Series CO gas concentration sensor is a wall-mounted CO measurement device designed specifically for industrial and residential applications. The device features a 20mm electrochemical sensor head providing high sensitivity, superior anti-interference performance, and stable long-term operation.

Featuring a robust ABS plastic housing with IP65 waterproof and dustproof protection, the CM101 operates reliably in harsh environments such as basement parking lots, auto garages, mechanical workshops, or industrial exhaust areas.

Key Features of the CM101 Series

Here are some highlighted features of the CM101 Series CO gas concentration sensor:

Diverse and Flexible Signal Outputs

The device fully supports the most popular output signal standards today:

• Analog Signals: 0-10 VDC and 4-20 mA, easily connecting to PLC, DDC controllers, or data acquisition systems.

• Communication Signals: Modbus RTU via RS485 port, supporting long-distance data transmission and seamless integration into Building Management Systems (BMS).

• Relay Outputs: 2xRelay 1A @ 220V AC, allowing direct connection to ventilation fans, alarm horns, or warning lights.

Replaceable Electrochemical Sensor Head Design

Cabitek CM101 utilizes a 20mm round electrochemical sensor head. This modular design allows technicians to easily replace the entire sensor head after extended use without replacing the whole device, optimizing maintenance costs for businesses.

Safety Protection Circuitry and High Durability

The device is equipped with overvoltage and reverse power polarity protection circuits, eliminating the risk of short circuits and fires due to technical wiring mistakes during installation. The outer casing is made of high-grade ABS plastic, lightweight, aesthetically pleasing, and achieves an IP65 protection rating against water and dust ingress.

Optional Direct-Display LCD Screen

Users can choose the version integrated with an LCD screen to directly display the CO gas concentration value in ppm units. This helps operating technicians easily monitor metrics on-site without accessing the central software.

Detailed Technical Specifications of the CM101 Series

Technical Parameters	Details
Model	Cabitek CM101 Series
Standard Measuring Range	50ppm, 100ppm, 200ppm, 300ppm
Extended Measuring Range	100ppm, 300ppm, 500ppm, 1,000ppm
Sensor	20mm round electrochemical sensor head
Converter	Digital
Measurement Error	±3%
Response Time	Under 15 seconds (Customizable via DIP Switch from 1s to 30s)
Power Supply	AC 24V (±5%), 50-60 Hz or DC 12…28V
Power Consumption	Under 3 W
Analog Outputs 1 & 2	0-10 VDC (min load 1,000 Ω), 4-20 mA (max load 500 Ω)
Communication Output	RS485, Modbus RTU standard protocol
Relay Output	2xRelay 1A @ 220V AC (when selecting the LCD option)
Protection Rating	IP65 (waterproof and dustproof)
Housing Material	High-grade ABS plastic
Display Screen	Optional LCD screen displaying ppm units
Operating Conditions	Temperature -10 to 60°C, humidity 15-90% rH
Dimensions	105 x 102 x 39 mm
Weight	120 grams

DIP Switch Configuration

Below is a detailed guide on configuring the states of DIP Switches (1, 2, 3, 4) on the circuit board to set up the CO gas concentration range and adjust the signal response time according to actual needs:

Measuring Range Setting Table (DIP Switch 1 and 2)

DIP 1 State	DIP 2 State	Basic Range	Extended Range
OFF	OFF	50 ppm	100 ppm
ON	OFF	100 ppm	300 ppm
OFF	ON	200 ppm	500 ppm
ON	ON	300 ppm	1,000 ppm

Response Time Setting Table (DIP Switch 3 and 4)

DIP 3 State	DIP 4 State	Response Time
OFF	OFF	1 second
ON	OFF	5 seconds
OFF	ON	15 seconds
ON	ON	30 seconds

Practical Applications of the CM101 Series CO Gas Sensor

The CM101 Series CO gas concentration sensor is widely used in various fields:

• Exhaust Gas Control in Parking Lots and Auto Garages: In underground parking lots of apartments, commercial centers, or repair garages, the constant traffic releases large amounts of CO gas. CM101 continuously monitors CO concentration and automatically controls exhaust fans to operate when the concentration exceeds the threshold, saving fan operational energy.

• Early Fire Warning Detection: In the initial stage of smoldering fires (underground fires), CO gas is generated very quickly before visible smoke or high temperatures appear. The CM101 CO sensor helps detect early fire risks in warehouses and technical rooms.

• Indoor Air Quality (IAQ) Monitoring: The device is installed in movie theaters, auditoriums, restaurants, cafeterias, and exhibition centers to monitor air quality, detecting the accumulation of cigarette smoke, kitchen smoke, or other pollution sources.

Cross-Sensitivity Table with Other Gases

The following values are for reference only, not for cross-calibration. Cross-sensitivity may be non-linear or non-proportional; data is based on 5-minute gas injection testing.

Test Gas	Test Concentration	Equivalent CO
Carbon monoxide	100 ppm	100 ppm
Hydrogen sulfide	50 ppm	0 ppm
Sulphur dioxide	20 ppm	0 ppm
Hydrogen	100 ppm	< 35 ppm
Nitric oxide	50 ppm	< 10 ppm
Ethanol	200 ppm	< 1 ppm
Ammonia	50 ppm	0 ppm
Chlorine	15 ppm	< 1 ppm
Ethylene	100 ppm	96 ppm

Warning Levels and CO Gas Exposure Standards

Concentration	Standard	Guidelines
200 ppm	NIOSH	Short-term exposure limit in 15 minutes; suitable for high alarms.
50 ppm	OSHA	Limit for an 8-hour work shift; can be used for low alarms.
50 ppm	UMC	Recommendation to activate parking lot ventilation.
35 ppm	EPA	1-hour average ambient air limit.
35 ppm	NIOSH	PEL-TWA for an 8-hour work shift.
25 ppm	ACGIH	TLV-TWA 8 hours; ideal low alarm threshold.
25 ppm	IMC	Recommendation to activate mechanical parking lot ventilation.
9 ppm	EPA	8-hour average ambient air limit; commonly used as maximum level in offices.

Product Code Selection Guide for CM101 Series

Base code CM101-. Select basic or extended range, two analog outputs (unused, 0-10 VDC, or 4-20 mA), Modbus, LCD, and relay. Relay can only be selected when LCD is present.

Example: CM101-0-1-1-1-1-1.

Wiring and Installation Instructions for CM101 Series

• Analog outputs 0-10 VDC / 4-20 mA use pins 24V, GND, AO1, AO2; Modbus uses 24V, GND, A, B. Use an isolated 24 VAC power supply when operating RS485 with AC power.

• Mount the sensor vertically with the probe pointing downwards; avoid hot/cold sources, direct sunlight, and rain.

• Each sensor has a maximum coverage radius of 15.2 m (725 m²), with an ideal area of about 400 m². Prioritize central pillars and arrange to cover the entire area.

• Install the sensor 1-2 m above the floor; 1.5 m is recommended.

Where to Buy CM101 Series CO Gas Concentration Sensor?

Cabitek is a leading reputable provider specializing in sensor solutions and automation measurement equipment in Vietnam. When purchasing the CM101 Series CO gas concentration sensor product at CABITEK, customers can rest assured regarding quality and support policies:

• 100% genuine products, full CO/CQ documentation.

• Team of experienced engineers offering precise configuration advice according to needs.

• Competitive pricing, long-term warranty policy.

• Dedicated technical support throughout installation and operation.

Conclusion

The CM101 Series CO gas concentration sensor is a comprehensive, accurate, and effective safety monitoring solution for all building projects, basement parking lots, and industrial factories. Equipping CO sensors not only complies with occupational safety standards but also protects human health and lives.