Nighthawk Carbon Monoxide Detector

Nighthawk carbon monoxide detector saves life!



Universal Security MICN109

Power Source: 9DC Lithium

Sensor: Electrochemical



Quantum Eye

Sensor: Chemical



BRK Brands HD6135FB

Power Source: 120VAC, 60HZ
9V battery back-up
Sensor:  Electrochemical

Kiddle C310D

Power Source: 9DC Lithium
Battery Factory Preinstalled
Sensor: Electrochemical



First Alert CO600

Power Source: 110VAC

Sensor:  Electrochemical

2 GIG Technologies

Power Source: one 3V CR123A battery

Sensor:  Electrochemical

First Alert CO615

FIRST ALERT CO615
Power Source: 110VAC
2x1.5VAA batteries back-up
Sensor: Electrochemical



PRO-TECH 7035-SL

Pro-tech 7035 SL
Power Source: 9DC Lithium
Battery Factory Preinstalled
Sensor: Water-Based

Universal Security MCND401

Universal Security Instruments MCND401B-M
Power Source: 120VAC, 60HZ, 60mA
9V battery back-up
Sensor: Solid state, metal oxide

Kidde Model KN-COB-DP-LS

Kidde Model KN-COB-DP-LS
Power Source: 120VAC, 60HZ, 60mA
9V battery back-up
Sensor: Electrochemical



Kidde Model KN-COP-DP

Kidde Model KN-COP-DP
Power Source: 120VAC, 60HZ, 60mA
9V battery back-up
Sensor: Electrochemical

Kidde KN-COB-LCB-A

Kidde KN-COB-LCB-A
Power Source: 120VAC, 60HZ, 60mA
9V battery back-up
Sensor: Electrochemical

Longhorn LH838LCD

Longhorn LH838LCD
Power Source:3x1.5VAA batteries
Sensor: Electrochemical




SITERWELL GS 811

SITERWELL GS 811
Power Source:3x1.5VAA batteries
Sensor: Electrochemical


Longsin LS-858-3

Longsin LS-858-3
Power Source:DC9V(6F22 battery)
Sensor: Electrochemical



In this article I will briefly explain how the CO Monitor works. The CO Monitor is used for monitoring the concentration of the poisonous gas Carbon monoxide (CO). It’s not the first time we mention that every household needs to have at least one CO Monitor in their home or office.


Each monitor consists of a sensor and an electronic block. The sensor in most of the cases is electrochemical. When the sensor detects the CO, it starts an electrochemical process in which electricity is produced, then the electricity is converted into information of the electronic block. The electrochemical sensors have a lifespan of 2-3 years, but there are some models with a lifespan of 5-7 years. The lifespan of the sensor depends on its type and where the CO monitor is used. The lifespan of the sensor must not be confused with the guarantee of the CO Monitor. It is frequently met when the sensor is damaged, it is displayed an "Err" message and the screen shows a large concentration of CO. The electrochemical sensors are not repaired, so the CO Monitor is replaced.

Carbon monoxide sensor

The electronic block accepts power from the sensor and converts it into information or a sound signal. The main part of the electronic block of the CO Monitor is the microprocessor that transmits a signal to the buzzer or the display. Rarely may any damage occur in the electronic block. Sometimes when the CO Monitor is powered by the mains, the damage in the electronic block may occur as a result of an electric shock. The cost of buying a new detector is often less than the cost of repairing the electronic block.

The CO Monitor is best to install in the kitchen where you use gas appliances which emit Carbon monoxide. The diagram below shows where the detector should be installed in order to function properly. Never put the detector more than 3 meters away from the gas appliance or the heater. Never put the CO Monitor over the gas appliances as the cooking fumes damage the sensor. We recommend that you have one CO Monitor in the kitchen, one in the bedroom and one in the garage. For your information, the CO Monitor does not show the concentration of natural gas or propane butane.

Carbon monitor place

Why is it important to choose the right model of CO Monitor?

When buying a CO Monitor, you should ask whether it is tested in the manufacturing plant. Most plants have a laboratory where the CO monitor is tested and adjusted, so that it meets certain quality standards. The test is carried out in a special chamber with CO.

Carbon monoxide manufacturing plant
Carbon monoxide laboratory

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