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Questions and Answers
What color indicates a pressure level between 50% and 100%?
Which segment corresponds to a pressure range of 0% to 35%?
What is the pressure display for a range of 50% to 100%?
What does a yellow color signify in the pressure status?
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How many segments are used to indicate pressure levels on the HUD?
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What does the logo screen display when the PASS device is activated?
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What does the buddy light indication cycle through during the start-up sequence?
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Which icon indicates that the SCBA should be removed from service after use?
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What happens if the SCBA should not be used?
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What may cause the actual time remaining to be less than the calculated time displayed?
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How is the time displayed on the primary screen calculated?
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What does the primary screen's countdown timer indicate?
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How can the secondary screen be accessed?
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Study Notes
Start-up Sequence
- PASS device initiates a start-up sequence from sleep mode, communicating SCBA state to the control module.
- Displays the MSA logo, unit number, and assigned riding position on the logo screen.
- Buddy lights on power and control modules sequence through red, yellow, and green colors.
- A start-up tone is played by the power module during activation.
- Conducts a self-test to verify operational status; results displayed on the self-test screen.
- Successful self-test shows a "Go" icon, indicating SCBA readiness for service.
- An overhaul reminder icon indicates the need for maintenance; SCBA should be removed from service.
- A Hardware Alarm icon signifies the SCBA is not operable; full alarm activation prevents further operation until addressed.
Primary Screen
- Displays critical user information, including calculated remaining service time for SCBA.
- Countdown timer reflects estimated rated service pressure until it reaches 35%, based on Air Management Guidelines.
- Actual remaining air time may vary due to breathing rate fluctuations; use the time indicator as a general guideline.
- Time display is calculated from the average breathing rate over the last three minutes, which may drop under increased demand.
Secondary Screen
- Accessible via a single press of the green button, showing additional operational details:
- Temperature Gauge
- Bluetooth Connectivity
- Long Range Radio Icon
- Battery Status
- Pressure levels displayed using a color-coded system:
| PRESSURE | COLOR | DISPLAY |
|---|---|---|
| 50 - 100% | Green | 1425$5.75_{PSI}$ |
| 36 - 49% | Yellow | |
| 0 - 35% | Red |
HUD Pressure Status
- HUD conveys pressure and alarm status through light pipes inside the facepiece, with pressure on the right and alarm on the left.
- The pressure indicators are segmented into four ranges, represented by specific LED colors:
| SEGMENT | PRESSURE RANGE | HUD LED |
|---|---|---|
| Segment 1 | 75 - 100% | ooooooo |
| Segment 2 | 50 - 74% | oo○○○○○ |
| Segment 3 | 36 - 49% | ○○○○○○ |
| Segment 4 | 0 - 35% | ○○○○○○ |
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Description
The PASS device goes through a start-up sequence when waking up from sleep mode, providing information to the control module and performing a self-test.
