DT155 Heart Rate

Sensor Description:

How it works:

Unlike an electrocardiograph (EKG), which monitors the electrical signal of the heart, this sensor monitors the flow of blood through the veins. Best measurements are done at the ear lobe or on a fingertip. As the heart forces blood through the blood vessels, the amount of blood changes with time.
By graphing this signal, the heart rate can be determined, and some details of the pumping action of the heart can be seen on the graph. A sample graph is shown below.

What is it used for:

NOTE: This product is to be used for educational purposes only. It is not appropriate for medical or research applications. Specifically, it may not be used for patient diagnosis
The DT021 is mainly used for:

• Comparison the heart rate of different individuals.
• Comparing the heart rate of athletes and sedentary people.
• Checking person's heart rate before and after a short period of vigorous activity (such as doing jumping jacks). Note that the Heart Rate Monitor cannot be used during the activity. The movement will cause shifting of the ear clip and erroneous readings.
• Monitoring the recovery rate; that is, how fast a person's heart rate returns to normal after exercise.

Calibration

No need to calibrate the DT021.

Sensitivity adjustment.

Sometimes, especially when in a very lighted environment, the sensor should be adjusted. This can be done by a small jeweler's screwdriver through a hole in the back of the amplifier box.

Specifications:

• Range: 0V to 5V
• Sensitivity: 5mV