AMGaDS III Plus Control Module and Alarm Panel

The AMGaDS III Plus gas detection system driver interface is located on the overhead console, and consists of an alarm panel on the right side and the control module on the left side.

The alarm panel has a green light, a red light, a buzzer, and a sensor. See Fig.. It is located within view from outside of the vehicle. The large green light is continuously illuminated during normal operating conditions.

Before entering the vehicle, always verify that the green light is illuminated. If the green light is not illuminated, do not enter the vehicle. Complete the alarm procedure previously outlined.

The alarm panel meets the California Highway Patrol Title 13-2008 and NFPA 52 2010 requirements. All drivers and technicians using it should be trained regarding the red and green lights, and the audible warning.

Test Button

Sensor Fault Indicator Lights

Zone 1 Leak Indicator Lights

Power Indicator Light

Zone 2 Leak Indicator Lights

Silence Button

Silenced Engaged Light

Relay Engaged Light

Shutdown Reset Button

Buzzer Alarm

Red Light

Green Light

Sensor

Fig. 1, AMGaDS III Plus Control Module and Alarm Panel

The control module, located on the left side of the overhead console, contains the status lights and control buttons for the system. The areas that the sensors monitor are defined as Zone 1 (cab) and Zone 2 (engine compartment). The control module has lights assigned to each zone that will illuminate if a sensor detects a trace level leak (between 20% and 30% LFL), a significant level leak (above 50% LFL), or if a sensor is disconnected or malfunctioning.

• Trace Level: If either sensor detects gas fumes at a concentration greater than 20% to 30% LFL (1% gas in air by volume), the amber light next to the "Trace" indicator for that zone will flash. There is no buzzer alarm for a trace level detection, and the large green light on the alarm panel will remain illuminated.

• Significant Level: If either sensor detects gas fumes at a concentration greater than 50% to 60% LFL (2.5% gas in air by volume), the small red light next to the "SIGNIFICANT" indicator for that zone will flash. After approximately 15 seconds, the large green light on the alarm panel will switch off, the red light will illuminate, and the buzzer will sound. All alarm indicators will remain on as long as fumes are detected.

• Sensor Fault: If the system detects that either of the sensors has been disconnected or has malfunctioned, an amber light next to the "Sensor Fault" indicator for that zone will illuminate.

The control module also has buttons used to test or reset the control module after an alarm. Red lights next to each button indicate when they are engaged.

• Shutdown Reset: If an alarm has been activated and the "Relay Engaged" light is illuminated, the "Shutdown Reset" button will reset the internal relay. Press the "Shutdown Reset" button only after the gas has cleared, the buzzer has turned off, and the alarm panel light has returned to green.

• Push To Silence: If an alarm has been activated, the "Push To Silence" button will silence the buzzer.

See Table. for the functions of all lights and buttons on the overhead console.