Gas Alarm System 4th Floor, Kjemi V If Gas Alarm, What to do? 1.There is 1 min delay before signal goes to the fire brigades (if high alarm) 2.Hurry to the alarm central. Turn the timer above the panel to further delay the signal Set the “Lyd/lys” switch below the panel to 0. This turns off the sirens. 3.On the panel, locate which sensor (channel) is in alarm, and check the concentration. Decreasing concentration: If possible try to figure out what triggered the alarm. Get the situation under control. When signal level drops below low alarm: Push the Acquit button on the central to “reset” the signal to the fire brigade Increasing concentration: Figure out why! Get the situation under control. If signal level drops below low alarm: Push the Acquit button on the central to “reset” the signal to the fire brigade Out of control: Turn back the timer to activate the signal to fire brigade (still 1 min delay) Set the “Lyd/lys” switch to 1 to activate the sirens again Evacuate the building 4.Under control: Remember to turn back the timer to enable the signal to fire brigade and set the “Lyd/lys” switch to 1 to enable the sirens again

Alarm levels and actions 4th floor block 5. 7 labs covered. 3 detectors in each lab: one CO and two LEL (ceiling/floor) calibrated for CH4 CO: – Low alarm at 20 ppm*, beeper/flashing red light in corridor outside the lab is triggered, no evacuation needed – High alarm at 40 ppm*, fire alarm with automatic call for the fire brigade after one minute, full evacuation of whole building CH 4 (and other hydrocarbons): – Low alarm at 20** LEL, same actions as for low CO alarm – High alarm at 40** LEL, fire alarm with automatic call for the fire brigade after one minute, full evacuation of whole building Lower Explosion Limit (LEL): Lowest concentration for explosion in air, e.g. H 2 : ca 4 vol%. UEL corresponding upper limit Adm. Norm: – Mean value concentration limit allowed for continuous exposure during an 8 hours shift, e.g. 25 ppm CO, 10 ppm H 2 S. Certain rules for short time exposure to higher concentrations, 100 ppm CO Cross sensitivity: – Sensitivity to other gases than calibrated for. CO-detectors are cross sensitive to H 2, and CH 4 to other hydrocarbons Detectors, CO+2xLEL Gas alarm central

Timer for delayed signal to fire brigade Switch for siren and lamps in corridor