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| BT17i
Blood Pressure Sensor User’s Guide
Short description
The Blood Pressure sensor BT17i allows measuring arterial blood pressure. The sensor
measures the pressure in the connected cuff caused by the interaction between the cuff
and the blood flow through the brachial artery. The systolic and diastolic blood pressure
can be calculated using the oscillometric method (non-invasive method).
The Blood Pressure sensor consists of:
•
a pressure sensor with measurement range between 0 .. 375 mmHg,
•
a standard adjustable blood pressure cuff (size: 24 cm to 35 cm),
•
a bulb pump with a control valve.
The blood pressure cuff consists of an inflatable bladder connected by one hose to a
hand pump bulb and by a second hose to the pressure sensor box. The user can set the
rate of cuff deflation manually with the control valve.
The sensor produces an output voltage, which varies linear with the measured pressure.
The special circuitry in the sensor minimizes errors due to temperature changes.
The Blood Pressure sensor can be directly connected to the analog BT inputs of the CMA
interfaces. The sensor cable BT - IEEE1394 needed to connect the sensor to an interface
is not supplied with the sensor and has to be purchased separately (CMA Article
BTsc_1).
Important:
The Blood Pressure sensor is not appropriate for medical applications. This sensor is to
be used only for educational purposes. Read this manual before you start measurements
with the sensor. Notice that over inflation of the cuff may cause pain and/or injury.
Sensor recognition
The Blood Pressure BT17i has a memory chip (EEPROM) with information about the
sensor: its name, measured quantity, unit and calibration. Through a simple protocol
this information is read by the CMA interfaces and the sensor is automatically
recognized when it is connected to these interfaces. If your Blood Pressure sensor is not
automatically detected by an interface, you have to manually set up your sensor by
selecting it from the Coach Sensor Library.
Calibration
The Blood Pressure sensor is supplied calibrated. The output of the Blood Pressure
sensor is linear with respect to pressure. The calibration function is:
p (mm Hg) = 83.34 * V
out
(V) – 16.67
The Coach software allows selecting the calibration supplied by the sensor memory
(EEPROM) or the calibration stored in the Coach Sensor Library. For better accuracy the
pre-defined calibration can be shifted.
