sira engineering and solutions
The Process is a logical and seamless system.
Carbon monoxide sensors (for petrol car exhaust fumes) and Nitro-dioxide sensors(for diesel car exhaust fumes) are installed in the car park based upon a formula.
The formula is based upon how the gas behaves (heavy / light etc ) and toxicity of the gas(Fumes)
Each sensor is wired back to the controller (typically three wires per sensor)
The Controller monitors the sensor inputs which are analogues value, expressed as a percentage.
If the percentage is over a given amount for a given time the controller will send a signal to start the supply and exhaust fans of the car park
The fans run for a given time
These times and set points are as per AS1668 as per a minimum value
The Variable Speed Drive Connected to the motor ensure a soft start up reducing energy costs and wear & tear on the mechanical plant
The Control of the exhaust and supply fan motors are also interfaced (via a relay) with the base building fire trip control