3LEL.m

[Jespa]

Таблица Alarm Priorities
Priority 1:
Confirmed H2S Gas – 2ooN).
Confirmed “High” HC Gas (25%, ***3LEL.m***) – 2ooN.
Temporary Refuge Gas (H2S, HC, CO, CO2, O2).
Confirmed Fire (Flame, Smoke, Heat) – voted or 1ooN.
Fire suppression release (Deluge, CO2, etc.).
MAC, GPA, Toxic Gas, PAPA.
Critical System Faults.
“Critical” Process (DCS) pre-alarms.
Critical Loops (DCS).
Field ESD Pushbuttons (ESD 1 &2).

Правильно ли я понимаю, что это - трехкратное превышение нижней взрывоопасной концентрации? если так, что что значит буковка "m"?
Заранее спасибо!

[Erdferkel]

Не это ли?
"Definitions of Terms
Gas Concentration Measurement Terms used in this manual:
• LEL: The volume ratio of flammable gas or vapor in air below
which an explosive atmosphere will not be formed.
• LEL.meter: Integral of the gas concentration along the optical path
expressed in units of concentration, multiplied by the distance.
NOTE: 100% LEL x 1 meter = 1 LEL.meter"
http://media.msanet.com/na/usa/permanentinstruments/GasSensorsTransmitters/SafEyeXenon800/10055711.pdf