IV. ALARM MODES
17
1. FIRST STAGE ALARM FOR 12.5% LOW AIR PRESSURE:
On a first level low pressure alarm the monitor will
alarm at 12.5% below the programmed base line air
pressure. When this happens the backlight on the
monitor screen will light up. The green LED light will go
out, the Red warning light will begin to flash and the
audible beeper will cycle at 1 flash or beep per second,
the alarmed wheel position will be displayed. The
pressure of the low tire, and the words LOW
PRESSURE will be displayed on the monitor (
see
Figure 4-1
). Pressing any of the buttons or after 100
seconds the audible alarm will be silenced. The
monitor will continue to display the wheel position, air
pressure of the alarmed wheel position and the words
LOW PRESSURE until the problem is corrected. If
the alarm comes on and the FAST LEAK icon appears
(
see Figure 4-2
), this means the tire is loosing air at a
rate faster than 2.8 PSI in a 12 second period. The
FAST LEAK icon will only be displayed during the fast
leak and will go out after 18 seconds when the air
quits leaking from the tire. We suggest that the tire be
inspected immediately.
Figure 4-1
Figure 4-2
On a level 2 Low Pressure Alarm the monitor will alarm when the pressure has reached
25% below the programmed baseline air pressure.
The National Highway and Traffic
Safety Administration considers a tire flat when the pressure is 25% below the tire
manufacturers' recommended operating pressure.
When this happens the backlight
on the monitor screen will light up. The green LED light will go out, the red warning light
will begin to flash and the audible beeper will cycle at 2 flashes or beeps per second,
the alarmed wheel position will be shown, the pressure of the low tire, and the words
LOW PRESSURE will be displayed on the monitor similar to Figure 4-1. The screen will
display the same information as a Low Pressure Level 1 Alarm. Pressing any of the
buttons or after 100 seconds the audible alarm will be silenced. The monitor will
continue to display the wheel position, air pressure of the alarmed wheel position and
2. SECOND STAGE ALARM for 25% LOW AIR PRESSURE:
