sewerin EX-TEC SR4

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• this measuring range is used to

monitor proximity to the

LELLEL

LEL

(

lower

explosion

limit)

• after approx. 8 seconds' warm-

up time a stable zero point is

reached

• the pump runs at minimum power

and the acoustic operating signal

(item 7) sounds every 5 seconds

• when the pre-set threshold of

20 %LEL is exceeded

methane:methane:

methane: 20 %LEL = 0,88 %VOL

(display = 0,90 %VOL)

propane:propane:

propane: 20 %LEL = 0,34 %VOL

the

advance alarmadvance alarm

advance alarm is triggered

both optically (item 1) and

acoustically (item 7)

• the advance alarm is an

intermittent tone quite distinct

from the operating signal;

ceases after a certain periodceases after a certain period

ceases after a certain period

and cannot be cleared

• if the concentration exceeds

100 %LEL

methane:methane:

methane:100 %LEL = 4,40 %VOL

propane:propane:

propane:100 %LEL = 1,70 %VOL

the

main alarmmain alarm

main alarm is triggered

optically (item 1) and acoustically

(item 7)

sewerin EX-TEC SR4 - Page 19