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3.2 How to Inspect the M-20
The M-20 must be visually inspected on a daily basis prior to being used
underground.
Your inspection should consist of the following:
1.) Check the gauge. The pointed white indicator on the Gauge is normally
in the green. Remove the M-20 from service if the white Gauge
Indicator is in the red. If the case is damaged and the gauge cannot be
read, the unit must be removed from service. If the view through the
clear Base is obstructed for any reason, such that a proper examination
cannot be performed (e.g. scuff marks, stickers, paint) the M-20 must
be removed from service. The white mark on the Gauge is the zero
pressure mark.
2.) Inspect the apparatus for the indications of high force impacts.
Indications of high force impacts are listed below. If any of these signs
are present the M-20 must be removed from service:
a. Case cracked, burned, deformed, or excessively worn.
b. Excessive gap between Cover and Base. This indicates that unit
has been opened and re-closed.
c. Damaged Latch or Cover Band. Severe dents or wear spots in
the band or the band is out of position.
d. Gauge bent or white indicator needle broken.
e. Dirt, debris, or moisture visible through the Case.
f. Belt loops broken. A cracked Belt Loop is an indication of a
severe impact while off the belt.
3.) Missing Tamper Ball
4.) Ensure that the M-20 EEBD has not exceeded the life date printed on
the information label.
Ensure belt worn period (5 consecutive years) has not expired.
If the M-20 fails any of the above inspections, it should be removed from service
and returned to Ocenco Incorporated facility.
