PT0E‑0730
31
９．Definition of words
Vol%
Gas density is expressed by the unit of a part.
ppm
Gas density is expressed by the unit of a part per.
10,000ppm＝1vol%
%LEL
Suppose to put the Lower Explosive Limit as 100 and at that time, combustible gas density
is expressed by the unit of a part per hundred.
Iso‑butane：100%LEL＝1.8vol%
N‑hexane ：100%LEL＝1.2vol%
Calibration
By use of calibration gas etc, it is to adjust the reading, display value or set value to
the true valued.
PEAK value
MAX or MIN value in a period.
ALARM preset value
This is an alarm preset point value to give alarm when it comes to this alarm point.
Maintenance check
This is a work to maintain the required function and condition to perform.
Data logging
Every internal of period, the function to save memory of gas density at alarm is provided.
Hung‑up phenomenon
After suck the high density gas and introduce fresh air into instrument, the phenomenon to
show higher reading by effect of residual gas for a while.
Oxygen deficiency
According to the decrease of oxygen, it is a phenomenon to make trouble for humans.
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