TM 5-4220-211-12&P
1-6.
DETECTOR KIT AND TEST TUBES. The detector kit is an instrument which, when used with an appropriate test
tube, will indicate the quantity of certain contaminants in the surrounding air being drawn into the air compressor. The
detector kit is a field use instrument as opposed to a laboratory test instrument. The accuracy of the detector is consistent
with usual field instruments. When used with the appropriate test tube, the detector will provide the user with a quantitative
measure of the amount of carbon dioxide or carbon monoxide in the air around the intake of the air compressor. The gas
detector kit consists of two major elements. They are: a calibrated air pump which will pump a known volume of air with
each stroke and a set of test tubes containing a chemical reagent which will change color in the presence of the specified
gas being evaluated. The change in color of the chemical reagent in the test tube is then compared to a color chart to
determine the gas concentration level in the air being tested. The values determined by the gas detector kit may then be
compared to minimum air purity values shown in Table 1-1 for acceptability.
Table 1-1. AIR PURITY STANDARDS
Oxygen
20 to 22% by volume
Maximum Carbon Dioxide
0.100% by volume (1000 ppm)
Maximum Carbon Monoxide
0.002% by volume (20 ppm)
Total Hydrocarbons, other than Methane
0.0025% by volume (25 ppm)
Maximum Total Oxidants
0.000005% by volume (0.05 ppm)
Dust and Water
Lack of any residue on membrane after
passing 5000 cc of air through filter
Particulates and Oil Mist
5 mg/m3maximum
Odor or Taste
Not objectionable
Section III
DETAILED DESCRIPTION
1-7.
AIR COMPRESSOR UNIT. The significant features, items and controls which affect the operation and
maintenance of the air compressor unit are shown in Figure 1-3 (unless otherwise noted) and are described as follows.
The technical principles of operation of the compressor are listed in Section III.
a.
Engine Fuel Tank. The engine fuel tank (1) has a capacity of approximately 4 quarts (4 liters). This is
sufficient fuel for about 3/2 hours of operation at full load.
b. Engine Fuel Filter. The engine fuel filter (Inline type) is located in fuel line, between fuel pump and fuel tank.
The filter is intended to prevent dirt and other debris from entering the fuel pump and fuel system.
c. Engine Oil Fill Cap. The engine oil fill cap (3) provides an access point to add engine lubricating oil during
an oil change and to maintain proper oil level during engine operation.
d. Engine Oil Dipstick. The engine oil dipstick (4) is used to determine the level of lubricating oil in the engine
e. Engine Oil Drain Plug. The engine oil drain plug (5) provides a discharge point for draining engine
lubricating oil during an oil change and other maintenance operations.
f.
Engine Inlet Air Filter. The engine inlet air filter (6) prevents airborne dirt and solid contaminants from
entering and damaging the engine's internal components.
g. Engine Cold Start Primer. The engine cold start primer (7), when activated, provides additional fuel to
assist in cold weather starting of the engine.
h.
Engine Automatic Compression Release. The engine automatic compression release (8) has three
positions; "start", "run", and "neutral". When rotated to the "neutral" position, the engine compression is released and the
engine may be cranked an indefinite number of turns without encountering compression.
Change 3 1-3
