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Pulse Oximetry (SpO
2
)
Welch Allyn 144 Propaq Encore Reference Guide
Pulse Oximetry (SpO
2
)
Masimo SpO
2
Specifications
Characteristic Specification
Saturation (% SpO
2
)
Range
Resolution
Alarm Limits
1% to 100%
1%
52% to 100% (upper)
50% to 98% (lower)
Probe Accuracy (25° to 41° C)
Adults, Pediatrics: No motion
Neonates: No motion
Adults, Pediatrics, Neonates:
During Motion
a,b
a.Motion for adults and pediatrics is defined as rubbing and tapping motions at 2 to 4 Hz at an amplitude of 1 to 2 cm and a non-
repetitive motion between 1 to 5 Hz at an amplitude of 2 to 3 cm in induced hypoxia studies in the range of 70-100% SpO
2
against a laboratory co-oximeter and ECG monitor. This variation equals ±1 standard deviation which encompasses 68% of the
population.
b.Motion for neonates is defined as foot motions at 2 to 4 Hz at an amplitude of 1 to 2 cm against a laboratory co-oximeter and
ECG monitor. This variation equals ±1 standard deviation which encompasses 68% of the population.
70% to 100% ±2 counts
0% to 69% unspecified
70% to 100% ±3 counts
0% to 69% unspecified
70% to 100% ±3 counts
0% to 69% unspecified
Pulse Rate
Range: No motion
Range: During motion
a,b
Resolution
Alarm Limits
26 to 239 beats per minute, ±3 counts
26 to 239 beats per minute, ±5 counts
1 beat per minute
27 to 250 beats per minute (upper)
25 to 248 beats per minute (lower)
Note: Any pulse rate above 239 will activate the pulse rate alarm, even
if the upper alarm limit is set above 239.
If the lower alarm limit is set to 25, a pulse rate of 25 will activate the
pulse rate alarm due to the limitation of the displayable numeric range.
Pulse Rate Accuracy
No Motion
During Motion
a,b
±3 beats per minute
±5 beats per minute
Measurement averaging time 8 seconds
Alarm Hold-Off Time Period 10 seconds; resets if the sensor reports levels within limits before 10
seconds elapses
Circuitry Microprocessor controlled
Automatic self-test of oximeter when powered on
Automatic setting of default parameters
Automatic alarm messages
Electrosurgery interference
suppression
Ye s
Sensor Compatibility Compatible only with Masimo sensors listed in the Welch Allyn
Products and Accessories booklet.
Sensor LEDs
RED Wavelength
INFRARED Wavelength
660 nm (nominal)
905 nm (nominal)
Sensor Energies (Radiant Power) 0.13 mW to 0.79 mW at 50 mA pulsed