Sensors for National Instruments DAQ

Blood Pressure Sensor


The BP-220 is a blood pressure sensor that is intended for use with the GSPN-100 Gas Pressure Sensor to record blood pressure from the brachial artery. The output of the pressure sensor is an analog voltage that is recorded by a data acquisition unit and calibrated in millimeters of mercury (mmHg).

Once the cuff of the BP-220 is positioned on the upper arm of the subject, it is inflated to occlude the flow of blood in the subject’s arm. As the pressure in the cuff is gradually released, the return of blood flow in the arm can be monitored by either of two methods. In one method, an observer uses a stethoscope to listen for two characteristic sounds from the brachial artery that correspond to the systolic and the diastolic pressures of the subject. In the other method, a pulse plethysmograph is placed around the tip of a finger on the occluded arm. The recorded output of the transducer indicates the systolic pressure occurs when the pulse wave first appears and the diastolic pressure occurs when the pulse amplitude reaches a maximum.


Output Range 0V to 0.7341V
Input Range 0 - 300 mmHg
Calibration Required every use
Default Scaling Value 1V=408.6 mmHg or 0.2447V=100mmHg

Calibration Instructions
See GPSN-100 instructions.

Measurement Instructions
See GPSN-100 instructions.

  • Model: BP-220

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