The LogiCO2 MK9 is the life-safety CO2 sensor we install wherever gas is stored or dispensed in an occupied building. It drives a shutoff at 5000 ppm and alarms both audibly and visually, because in a loud cellar a light alone is not enough and in an empty one a horn alone is not either.
The 5000 ppm figure is the point at which the system stops being advisory and starts intervening. Below it, the sensor is reporting. At it, the supply shuts.
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Where the sensor goes matters as much as which sensor it is.
Low, near the storage and dispensing points, at the height CO2 actually collects. Cellars, walk-ins, plant rooms, back rooms and sealed cultivation rooms are the usual locations, because those are the enclosed low spaces where an accumulation becomes dangerous.
Mounting at head height is the most common mistake on installations we inherit, and it defeats the purpose of having a sensor at all.
A single MK9 works standalone. On a multi-room site they report into a LogiCO2 Central Unit, which drives up to twelve of them from one control point with live readings from each, so you have one place to look rather than twelve.
Life safety
Every electrochemical sensor drifts with age. A LogiCO2 sensor that has not been serviced is not a safety device, it is a box on a wall that used to be one, and nothing about its appearance tells you which.
Replacement is scheduled as a maintenance item on our accounts, so calibration never quietly lapses between inspections.
It depends on room count, layout and where gas is stored and used. The assessment specifies placement rather than leaving it to guesswork.
The strobe and horn alarm and the supply shuts off. The intent is to make the space safe without anyone needing to be present to react.
Where the sensor goes matters as much as which sensor it is.
