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20 Functional verification Welch Allyn VSM 300 Series
When the overpressure cutoff triggers, the pump stops, the dump and bleed valves open,
and the monitor displays E40. Any subsequent button press shuts off the monitor.
1. Restart the monitor.
2. Set the monitor to ADULT mode.
3. Set the inflation target pressure to 270 mmHg (36.0 kPa).
4. Increase the inflation rate, causing the overpressure cutoff to stop the pump and
open the bleed and dump valves.
a. Start the pump.
b. When the pressure (SYS window) reaches approximately 230 mmHg (32.4 kPa),
very rapidly squeeze the pump bulb while observing the digital pressure meter.
Assuming that you squeeze the bulb rapidly enough to reach the trigger threshold
and activate the overpressure cutoff:
• The pressure does not exceed 280 mmHg.
• The dump valve and bleed valve open, dropping the pressure to
approximately 0.
• E40 appears in the Sys window.
• Pressing any button causes the monitor to shut down.
5. Disconnect the test setup from the monitor.
If you executed this test as part of the functional verification procedure, proceed to...
• “Printer” on page 21.
• If the monitor has no printer, “SpO2” on page 23.
• If the monitor has no SpO2 option, “Temperature” on page 25.
• If the monitor has no temperature option, “Nurse call” on page 27.
Note
Due to NIBP implementation differences, this test does not verify overpressure
cutoff in earlier NIBP versions.
In those versions, due to a longer software delay in activating the cutoff function,
the normal overpressure cuff pressure is exceeded before the overpressure
cutoff safety triggers. If the normal overpressure-detection algorithm were to fail,
the overpressure cutoff safety function would trigger immediately.