Sensors for National Instruments DAQ

Respiration Monitor

The RMN-204 Respiration Monitor is a transducer used to measure the relative depth and frequency of breathing in a human subject during experiments where it is impractical to monitor breathing with a spirometer.

For example, the use of a spirometer to monitor breathing during a psychological test could be a distraction that affects the results of the test. If the subject is not familiar or comfortable with breathing through a spirometer, the subject cannot focus on completing the test. The RMN-204 permits breathing rates and relative amplitudes to be measured easily, accurately, and unobtrusively while the subject performs another task.

Measurement Instruction

1. Position the RMN-204 belt so that the pouch velcroed to the belt is facing the subject. Place the sensor so that it is resting on the subject's sternum and wrap the belt around the subject. The belt should be tight enough to resist slipping, but not so tight as to restrict the subject's ability to breathe comfortably.

2. Install the IX-ELVIS board into the National Instrument ELVIS platform or the IX-myDAQ board onto the NI myDAQ. If using ELVIS, connect the ELVIS power supply to the ELVIS unit and connect it to the computer via a USB cable. Ensure both of the power switches are in the “on” position. For the myDAQ, connect it to the computer using the USB cable.

3. Connect the MINI DIN7 connector of the RMN-204 to either CH1 or CH2 of either the IX-ELVIS or IX-myDAQ board.

4. Open the recording software, select the channel that the RMN-204 is connected to and ensure the range is set to +/-5V.

5. Record and monitor the subject's breathing. As the subject breathes in the voltage should rise, and as the subject breathes out the voltage should fall.

6. Clear the chart and breathe in and exhale 3 times, so three peaks are shown on the chart.

7. Press the Calibrate button to set the threshold limits.

The signal may be inverted if the IX-MYDAQ is used.
  • Model: RMN-204

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