Beurer PM90 Operations Instructions download pdf (Page 12)

Altitude, air pressure and temperature measurement

With your HR monitor you can measure the altitude above sea level,

the air pressure and the temperature.

The altitude is calculated according to the present air pressure. The

measurement principle of the monitor is based on the assumption

that the air pressure changes are caused by a change in the altitude.

The air pressure decreases at higher altitudes. As a rule of thumb:

An altitude difference of 10 m causes a change of 1.25 hPa in the air

pressure at sea level.

To be able to measure the altitude correctly, you have to set the

exact reference altitude of your location on the monitor before start-

ing the training.

If the air pressure changes during training due to the different

weather conditions, the altitude displayed will be different from the

actual altitude. Big variations in air pressure are a sign of a weather

change. During the course of a day, it is possible to have consider-

able variations in air pressure. Therefore, the altitude displayed on

the monitor should be compared from time to time to the reference

altitude of your location and adjusted if necessary.

The altitude details of your location can be taken from a topographi-

cal map, for example.

The body temperature can have a strong influence on the

temperature displayed as well as if the monitor is also cov-

ered by clothing. The monitor should be removed from your

wrist for approx. 2 hours to enable a correct temperature

measurement.

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Beurer PM90 Operations Instructions Page 12