Carbon Monoxide monitoring (CO monitoring) is very important for closed areas. In many countries, it is mandatory to install CO monitoring for closed or partially closed parking areas. This is extremely important for basement parking.
In a basement, there will not be sufficient natural air circulation. The cars produce a small amount of Carbon Monoxide when the engine is ON. This means that in a basement parking lot, a substantial amount of Carbon Monoxide will be produced. If the ventilation is not proper the concentration of CO in the basement will increase.
In order to prevent a hazardous condition, it is necessary to install a continuous CO monitoring system
CO Monitoring system with Exhaust fan controlled by PLC & VFD
For a basement system, an ideal monitoring system should consist of the following.
- A set of Carbon Monoxide sensors to be installed in various places around the parking lot.
- An exhaust fan which should operate immediately if the measured value of CO increases beyond recommended levels.
- Depending on the measured level, the speed of the Fan should vary. This is achieved through a Variable Frequency Drive (VFD).
- A PLC control panel consisting of a PLC (Programmable Logic controller) which takes all inputs from the CO sensors. Based on these inputs, it will give an output signal to control the VFD and the exhaust fan. Please see more on PLC Automation.
- An audible alert can be provided optionally. If the measured value of the CO increases beyond a certain value, it can generate an audible alert.
The CO sensor needs to be periodically calibrated. We also have self-calibrating type of sensor which might suit your requirement. The complete area is divided into multiple zones based on the number of exhaust fans you have. Each zone will need a separate control system. If a particular zone has a high content of Carbon Monoxide, those particular exhaust fans will be activated and so on. Hence in order to decide the number of zones, we will require your layout drawing indicating the exhaust fans.
Basement parking ventilation system
A proper ventilation system is required for basement car parking to eliminate Carbon Monoxide. As explained previously, all the exhaust fans are centrally controlled. The central control will be through a PLC based control panel. The panel will continuously monitor the level of Carbon Monoxide and process the signals. A set of VFD panels controls the speed of the exhaust system.