A-A-51939
24 April 1987
COMMERCIAL ITEM DESCRIPTION
MONITOR, TRI-GAS
The General Services Administration has authorized the use of this commercial item description.
This commercial item description covers a tri-gas monitor suitable for measuring levels of oxygen, methane and carbon monoxide in an industrial hygiene field environment.
Salient characteristics:
The tri-gas monitor shall be portable, battery operated and suitable for personal protection against three common hazards found in confined spaces. The unit shall continuously monitor the environment for oxygen deficiency and enrichment, methane and carbon monoxide.
The monitor shall be a waterproof, dust proof unit weighing approximately 2-1/2 pounds. It shall have a liquid crystal display (LCD) digital readout. The unit shall be equipped with both audible and visible alarms.
The monitor shall be supplied with the following accessories as a minimum:
(a) Acoustic earphones with 10 earpiece replacements.
(b) Three snap-on aspirator heads.
(c) Three sensors, 1 each for oxygen, methane and carbon monoxide.
(d) Ni-cad battery pack with charger.
(e) Snap-on body harness and a replacement harness.
The sensors shall be as follows:
(a) Oxygen: Range: 0-35 percent
Accuracy: ± 0.5 percent of reading
Alarm set point: 20-23 percent
Minimum detectable: 0.1 percent
(b) Combustibles (as methane):
Range: 0-99 percent LEL
Alarm set point: 20 percent LEL (methane)
Minimum detectable: 1 percent LEL
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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