Vernier Tech Info Library TIL #1426

Blood Pressure Sensor Detail Information

Blood Pressure Sensor, order code BPS-BTA, $105.00
Specifications and User Guide

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 Velcro. 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.

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 1403: What are the software requirements for the physiology sensors?

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, Small Blood Pressure Cuff, order code XSCUFF, **PRICE NOT AVAILABLE**

Created by: jrandall on May 07 2005
Last updated by: aplank on May 07 2009