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Blood Pressure Sensor Troubleshooting and FAQs

About this FAQ

  • Created May 7, 2005
  • Updated Oct 30, 2012
  • Article #1426

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Blood Pressure Sensor, order code BPS-BTA, $105
Specifications and User Guide

Please note that the Blood Pressure Sensor will not report Blood Pressure Parameters unless data collection has begun.

Please also note that you need to let the Data Collection software finish collecting data to get accurate blood pressure readings. Do not stop data collection prematurely, allow the software to complete data collection.

TROUBLESHOOTING
-Primary Test: Confirm that the version of Logger Pro is 3.4 or newer. Confirm that the sensor is set up correctly. The cuff should be positioned over the upper arm just above the elbow. The two rubber hoses from the cuff should be positioned over the bicep muscle (brachial artery) and not under the arm. Tighten the cuff on the arm using the attached hook-and-pile strip. You want the cuff to fit snug when no air is in it.
1. The readings displayed on the computer screen should be between 0 and 5 mm Hg before any air is pumped into the cuff.
2. Squeezing the rubber bulb repeatedly, inflate the cuff to a pressure between 150 and 170 mm Hg. When this maximum pressure has been achieved, place the rubber bulb on the desk. The built-in release valve will automatically deflate the cuff at a constant rate.
3. The exhaust rate should be between 2.0 and 4.0 mm Hg/s. If the cuff is not releasing the air or not releasing the air fast or slow enough, refer to the Specifications and User Guide for instructions on "Adjusting the Pressure Release Valve".
4. If the cuff will not inflate, check to see that the Pressure Release Valve is not completely closed. It should be opened about 4 turns from the closed position.
5. An appropriate sized cuff is required for the subject to obtain accurate results. The small cuff fits subjects with upper arm circumferences between 18.4 and 26.7 cm (CUFF-SM). The standard adult cuff accommodates upper arms between 27.9 and 41.7 cm. For large upper arms with circumferences between 33 and 50.8 cm, the large cuff should be used (CUFF-LG).

Is it a problem if the readings are not consistent? Blood pressure readings will differ from person to person and even between measurements on the same individual. Do not expect to receive the same measurements each trial since there are many factors that cause a person�s blood pressure to increase or decrease.

RELATED TIL ENTRIES
-TIL 1762: Logger Pro does not report Blood Pressure values or BP readings are not realistic.
-TIL 2025: I see the cuff pressure, but LabQuest does not report systolic and diastolic values.
-TIL 1403: What are the software requirements for the physiology sensors?
-TIL 1949: Will other gas pressure sensors work with a blood pressure cuff to give blood pressure data?

SPECIFICATIONS
Calibration(mm Hg): slope 56.11 (mm Hg/V), intercept 0.00 (mm Hg)
Pressure Range: 0 mm Hg to 250 mm Hg
Maximum Pressure without permanent damage: 1030 mm Hg
Typical Accuracy: � 3 mm Hg
Temperature Compensated: 0�C to 50�C
Combined Linearity and Hysteresis: typical �0.2% full scale
Response Time: 100 microseconds

CALIBRATION
This sensor cannot be calibrated.

RELATED VERNIER PRODUCTS
-Smaller cuff, Blood Pressure Cuff (Small), order code CUFF-SM, $32
-Larger cuff, Blood Pressure Cuff (Large), order code CUFF-LG, $35

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