Welch-allyn SureTemp PlusModule - User Manual Manuel d'utilisateur télécharger pdf (Page 9)

SureTemp Plus Module OEM Implementation Product Overview

Welch Allyn OEM Technologies Conﬁdential 9

Measuring Principle

The Welch Allyn proprietary probe utilizes a negative temperature coefﬁcient (NTC) thermistor

and control circuitry in combination with the SureTemp Plus module’s predictive algorithm to

calculate patient temperatures.

NTC thermistors have a large temperature coefﬁcient of resistance and change in resistance as

temperature changes. This predictable change in resistance is the basis for predictive

thermometry.

The oral/axillary probe is pre-warmed to 34

C (93

F) upon extraction from the probe well. The

probe-warmer circuitry is used to heat the probe tip before taking a temperature reading to speed

the convergence of the prediction algorithm. A fail-safe hardware shut-off circuit is included to

ensure that the heater shuts down in the event of a software failure.

When the probe is placed in the mouth, the heat supplied by the mouth reduces pulse widths to

zero.

The shape of the rising temperature curve is monitored and the best ﬁt to a curve is found. When

the curve ﬁt is stable, the ﬁnal predicted temperature is provided.

The module can determine the type of probe connected.

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Welch-allyn SureTemp PlusModule - User Manual Manuel d'utilisateur Page 9