Chemical Agent Point Detector System (CAPDS)

The chemical agent point detector system (fig. 9-14) is a local sampling detection device. It is used to detect the presence of chemical agents in the air. The system has an alarm that provides rapid warning. The CAPDS is capable of detecting nerve agents GB, CD, and VX in time to allow personnel to take protective countermeasures. The system provides a means of continuously sampling the outside air. It will automatically sound an alarm at the remote control unit and remote status unit.

Figure 9-14.-Chemical agent point detection system (CAPDS). 9-28

The CAPDS consists of a detector, two through-the-bulkhead units (TBU), a remote control unit, and a remote status unit.

The detector consists of the alarm module and the power supply. The alarm module contains a pneumatic system, an ionization and detection system, and an alarm electrical system, which is necessary to perform the agent sampling operations. The pneumatic system is used to supply air samples from the TBU to the alarm module for chemical analysis. It will then remove the air sample once the sample has been analyzed as exhaust.

The ionization and detection system draws air samples into a heater block where it is heated to a temperature of approximately 140 'F. The sample moves into a sensor cell for ionization. A sample containing chemical agents will increase the sensor cell's output and trigger the alarm. The alarm electrical system provides the power to maintain airflow, heater temperature, and the other electrical systems involved.

The power supply provides the input power from the ships electrical system. If the input power is lost, the power supply provides the power from an internal battery.

The through-the-bulkhead unit consists of an electronics and fan assembly. This assembly provides continuous air samples for the alarm module.

The remote control unit connects the remote status unit with the appropriate detector and the power supply. The remote status unit is mounted on the ship's bridge but has no control over the system. It merely reports the status of the system. However, it does have a manual override of the ship's alarm system.

Since the system is automatic, it requires no operation procedures once it is installed. To perform maintenance on the system, follow the guidelines listed in the planned maintenance system. ,

SUMMARY

In this chapter, you were introduced to biological warfare and chemical warfare operations, defense, and countermeasures. The various types of BW agents and CW agents were also described. Finally, you were introduced to various methods and equipment that are used to detect either B W agents or C W agents. Advancements are continuously being made to ensure that the Navy will be able to effectively conduct BW and CW defensive and countermeasures. As new equipment and systems are introduced to the Navy, read the manufacturer's technical manual to familiarize yourself with the new equipment and systems.