Minimize moving the CAM to and from areas of large temperature
differentials (as from a cool enclosure to direct sunlight).
(3)
Operation in Darkness.
The display contains light emitting diodes that light the display in
darkness. The diodes are activated anytime that the CAM is operating.
(4)
Operation in Blowing Sand or Dust.
Check filtered nozzle standoff for collection of dust. If dust is
visible, remove and replace the filter with a new filtered nozzle
standoff.
PART E -M8A1 AUTOMATIC CHEMICAL AGENT ALARM
The primary purpose of the M8A1 Alarm System is to detect the presence
of nerve agents in the air. The M8A1 Automatic Chemical Agent Alarm
System (Figure 4-37) has the same characteristics as the M8 but is a
dry system that uses a radioactive source to detect persistent and
nonpersistent Chemical Nerve Agents, G and V. It is 90 percent more
reliable and 90 percent faster than the M8 in detecting nerve agent
vapor and aerosols. The system is positioned the same as the M8
Automatic Chemical Agent Alarm.
It uses an ionization principle to continuously sample the air around
it. When nerve vapors are detected it sounds an alarm. It is not
designed to detect other than nerve agents. False alarms can be
caused by screening smoke, engine exhaust, rocket or missile
propellant smoke, paint fumes, floor wax, perfumes, cologne, cigarette
smoke, and electromagnetic pulse (EMP).
The M8A1 consists of an M43A1 Detector Unit and an M42 Alarm Unit.
The M43A1 senses the presence of nerve agents and produces an audible
signal. The M42 Alarm provides a remote audible and visual signal
when connected to the M43A1. Four BA 3030 Batteries provide power to
the alarm. When the system is hand carried or backpacked, a BA 3517/U
supplies the primary power. When an M10A1 Power Supply is a primary
DC power source, the BA 3517 is connected as a standby power source.
The M10A1 requires input power of 115 or 220 volts at 50, 60, or 400
Hertz and produces an average output of 29.5 Volts DC.
In a fixed-emplacement installation of the Alarm System, one to five
M42 Alarm Units may be connected to a single M43A1, Figure 4-38. The
number of detectors required to protect the unit front of a given area
is provided in Table 4-1.
IS0345
4-44
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