Service Diagnostics Calibration
5 - 10 0070-10-0691 Accutorr Plus Service Manual
5.5.8 Leak Test (7)
NOTE: 700 cc dummy cuff must be used.
Select Room Number 7 and press the NIBP START key to activate the test.
This test evaluates the ability of the system to maintain a steady pressure.
A fixed volume is pumped up to an initial differential pressure of approximately 250
mmHg and monitored for a fixed period of time. While the pump is operational, peak
pressure is displayed in the MAP display. When the target pump pressure is reached, the
peak pressure is frozen in the MAP display during a five second dwell. During leakage
measurement, the current pressure leakage is displayed in the MAP display and the
elapsed test time (in seconds) is displayed in the Temperature/Time/Interval display. After
the leakage measurement time has elapsed, the MAP and Temperature/Time/Interval
displays are blanked and a “00” (Pass) or “FF” (Fail) will be displayed in the Bed window.
Pressing the DEFLATE key at any time during the test causes the NIBP module to open
all valves to release the pressure, clear the MAP display, and end the test. The maximum
pressure drop is no more than 10 mmHg in any 90 second period when connected to a 700
cc volume. Pressing the DEFLATE key after the test is completed will clear the MAP
display and exit the test.
5.5.9 Over Pressure Test (8a, 8b, 8c)
NOTE: 700 cc dummy cuff must be used.
Select Room Number and Bed Letter per Table 5-6 on page 5-10. Press the NIBP START
key to activate the test.
This test evaluates the ability of the system to prevent an over pressure condition,
independent of software control, for each of 3 over pressure settings. A fixed volume of
700 cc’s is pumped to a target pressure that is above the maximum over pressure specified
for the respective over pressure limit (see Table 5-6 on page 5-10), while displaying the
real-time system pressure in the MAP display. For this test, the software over pressure
monitor is disabled. On completion, the MAP display indicates the maximum pressure
reached and the Patient Bed Letter Display indicates if the over pressure sensor was
activated (00) or not (FF). Pressing the DEFLATE key at any time during the test causes
the NIBP module to open all valves to release the pressure and end the test.
Following each overpressure hardware test, the UUT must be turned off and rebooted in
the diagnostic mode in order to re-enable the pump.
Table 5-6
TEST SIZE/MODE
TARGET PUMP
PRESSURE (MMHG)
TEST ROOM
NUMBER
SUB TEST PATIENT
BED LETTER
Low 157, ±5 8 a
Medium 210, ±10 8 b
High 315, ±15 8 c
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