Logger Pro does not report Blood Pressure values or BP readings are not realistic.

Verify that the release valve is set properly (-2 to -3 mm Hg/s).

This problem can happen when the software does not have enough data to calculate both systolic and diastolic readings. It is most likely to happen when the test subject has either large or very small biceps. This causes the data collection run to either terminate too quickly or have too much pressure remaining after the collection period has ended. This results in inaccurate, missing, and misleading values for systole, diastole, heart rate, and mean arterial pressure.

In most instances, the needle valve adjacent to the hand pump needs to be adjusted for exhaust rate so a pressure of 50 mm Hg is reached between 60 and 80 seconds into the sampling run. If you have several Blood Pressure sensors, you may want to mark one of them as the one for adjusting and leave the others in factory setting mode.

For the above conditions to be met, the release rate typically needs to be at -2 to -3 mm Hg/s (it is originally set at 3 mm Hg/s). If the Cuff pressure has fallen below 50 mm Hg in the first 50 seconds the flow rate is too high. It might be necessary for people with large or small arms to adjust the valve to keep it within this specified range. If the problem persists after the valve adjustment, see some common user related issues below.

1) Movement artifacts will leads to improper measurements. The BPS is very sensitive to movement artifacts. The subject’s arm and hand must remain still during measurements. In addition, the subject should not touch or move the release valve. Movement artifacts will be decreased if the person holding the pressure bulb lifts their index finger during the recording.

2) The cuff is not properly placed. Proper placement of the pressure cuff will increase the accuracy of the blood pressure measurements. The rubber hoses from the cuff should exit over the brachial artery and be 2 cm above the crease in the elbow.

3) The cuff is not appropriate for the subject. Younger students may need a smaller cuff (18 cm to 27 cm arm circumference). This small blood pressure cuff can be ordered separately: order code CUFF-SM. The large cuff is also available for students with arm circumferences greater than 39 cm: order code CUFF-LG

These instructions above (1-3) are located in the BPS Sensor Booklet.