NEULOG BLOOD PRESSURE LOGGER SENSOR GUIDE
Sensor's specifications
mm Hg
Arb
mm Hg +
Arb
Range and
operation
modes
0 to 250
0 to 820
0 to 250
ADC
resolution
13 bit
Resolution
0.12
0.1
0.02 mm Hg
Max sample
rate (S/sec)
100
Experiment Duration
: 1 second to 31 days.
Sensor's features:
Fully digital data
Rugged plastic ergonomic case
Blood pressure cuff attached to the sensor's body by a flexible
rubber hose
Hand pump with pressure valve for increasing and decreasing
pressure, attached directly to the blood pressure cuff by a flexible
rubber hose
Push button switch for Start/Stop experiments in off line mode
LED indicator of experiment status (blinks while collecting data)
Pre-calibrated sensing equipment
Note:
NeuLog products are intended for educational use.
Videos and experiment examples:
Videos, literature and other probes can be found at
www.NeuLog.com
.
In order to access the blood pressure sensor's page, choose
"Products" on the main menu and then "Blood pressure logger
sensor".
In order to access the blood pressure sensor's experiments,
choose "Example Labs":
o
Blood Pressure (B-1)
Technical background:
The philosophy behind NeuLo
g’s plug and play technology is based
on each sensor’s ability to store its own data due to an internal flash
memory chip and micro-controller in each plastic NeuLog body. This
technology allows the sensor to collect and then store the digital data
in the correct scientific units (
o
C,
o
F, Lux, %, ppm, for example).
The sensor is pre-calibrated at the factory. The built-in software in
the logger can be upgraded for free at any time using the provided
firmware update.
The blood pressure sensor uses the piezoresistive effect. The
transducer is made of two metal foils separated by silicon; when
pressure is applied on the transducer its resistance changes. One
side of it is at complete vacuum which enables the measurement of
the absolute pressure on its other side.
This transducer is built as a strain gauge with a Wheatstone bridge
circuit. Its voltage's output depends on the absolute pressure.
When the user pumps, a pressure is applied directly to the blood
pressure monitor cuff’s bladder and it is detected by an internal
sensing unit. The pressure in the cuff is equal to the pressure
operated on the subject's arm.
The heart beats affect the subject's pressure and thus create very
small fluctuations in the gas pressure in the cuff. This gives an AC
signal reading on a DC signal.
