14 Welch Allyn
Maximum and Minimum Temperature Ranges
The maximum and minimum temperature ranges are as follows
Normal Temperature Mode
Normal oral mode is the default operating mode for temperature determinations.
In Normal mode, the Spot Vital Signs measures temperature at discrete intervals, then calculates
the rate of change according to a proven algorithm. This allows the thermometer to predict the
end point the thermistor would reach if it were left in the mouth until it reached mouth tempera-
ture. This predictive feature allows the thermometer to arrive at an accurate oral temperature
reading in approximately 4 seconds.
Operator-selectable patient alarm limits are not available in Normal temperature mode. However,
temperatures that are outside the operating range of the device are noted on the temperature
display (see “Temperature Measurement Range Indicators” on page 27 for further details).
Monitor Temperature Mode
Continuous Monitor mode operation is normally used when difficult situations prevent taking
accurate temperatures in the Normal mode, or in clinical situations in which the clinician is inter-
ested in trending the patient’s temperature (see “Temperature Measurement Range Indicators”
on page 27 for further details). Maintain probe contact with the tissue for at least 3 minutes for
accurate oral/rectal temperature measurement, and 5 minutes for accurate axillary temperature
measurement. Monitor mode temperatures may not match identically to predicted “normal”
temperatures because of ambient temperature influence and other factors. The trend in temper-
ature is the important standard when in Monitor mode.
Operator-selectable patient alarm limits are not available in Monitor temperature mode. However,
temperatures that are outside the operating range of the device are noted on the temperature
display (see “Temperature Measurement Range Indicators” on page 27 for further details).
SpO
2
Operating Mode
The Spot Vital Signs incorporates the Nellcor Puritan Bennett
™
pulse oximetry system which
determines arterial oxyhemoglobin saturation (SpO
2
%) by measuring the absorption of red and
infrared light passed through the tissues. Changes in absorption caused by pulsation of blood in
the vascular bed are used to determine arterial saturation and pulse rate.
Oxygen saturation percent is calculated with each pulse detected, so the display is continually
updated. The pulse signal bar graph is an indicator of the strength and quality of the detected
pulses.
Measurement Maximum Minimum
Temperature
109.4
°
F
43.0
°
C
86.0
°
F
30.0
°
C
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