NEULOG BLOOD PRESSURE LOGGER SENSOR GUIDE
NeuLog blood pressure logger sensor
NUL-222
The NeuLog blood pressure sensor can be used for any science
experiment which involves blood pressure measurements such as in
the fields of Exercise Science, Biology, Physiology, Human Health,
etc.
The sensor comes pre-calibrated so you can start experimentation
right out of the box using this guide.
Among hundreds of possible experimental subjects that can be
studied with the NUL-222 sensor are: exercise studies, human health
studies, athlete comparisons, blood pressure abnormalities, and
many more.
The blood pressure sensor's measurement units are:
Millimeters of mercury (mm Hg): A standard non-SI pressure
measurement unit
Analog arbitrary units (Arb): An arbitrary value used to
demonstrate waveforms without a unit
Millimeters of mercury and analog arbitrary units (mm Hg +
Arb): A combination of both units
The blood pressure sensor measures the gas pressure in a cuff
attached to a person's arm. This pressure 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. These fluctuations
are what doctors hear when they perform a blood pressure check.
The sensor's hardware and firmware separate the average pressure
and the pressure fluctuations. They amplify the fluctuations and then
add these amplified fluctuations to the average pressure, creating a
signal that enables the calculation of the MAP, the systolic and
diastolic pressures.
The three ranges of the sensor show the real measured pressure
(with very small fluctuations in mm Hg), only the pressure amplified
fluctuations (Arb) and the combined signal of both of them.
In the "mm Hg + Arb" mode you can calculate these parameters:
MAP:
MAP (Mean Arterial Pressure) is the pressure where the fluctuations
are maximal.
The firmware starts by checking first the average pressure where the
largest fluctuations are.
Systolic:
The pressure exerted by the blood on the arterial walls while the
heart is beating (maximum pressure achieved). Ideally this value
should be in the 90 to 120 mm Hg range for adults and roughly 100
mm Hg for children aged 6 to 9.
This is the average high pressure where the fluctuations' magnitude
is 54% of their magnitude at the MAP.
Diastolic:
The pressure exerted by the blood on the arterial walls while the
heart is relaxed, between beats (the minimum pressure achieved).
Ideally this value should be in the 60 to 80 mmHg range for adults
and around 65 mmHg for children aged 6 to 9.
This is the average low pressure where the fluctuations' magnitude is
72% of their magnitude at the MAP.
NEULOG BLOOD PRESSURE LOGGER SENSOR GUIDE
Use of the blood pressure cuff:
To accurately record blood pressure rates, you must first properly
attach the blood pressure cuff to the subject being tested.
Note: The cuff works through clothing, however, try to minimize
layers for the best readings possible.
1. Unwrap the blood pressure cuff and find the Velcro connection
pads.
2. Situate the blood pressure cuff with the Velcro pads facing
outwards.
3. Wrap the blood pressure cuff tightly, but without causing
discomfort, around the subject’s upper arm.
4. Ensure that the rubber tubing (connected directly to the blood
pressure cuff) is situated only a couple of centimeters above the
inner elbow.
5. Close the air pressure release valve by twisting the metallic
knob until it tightens.
6. Using the hand-pump, fill the blood pressure cuff’s bladder until
it forms a snug but not uncomfortable fit (around 170 mm Hg
should be enough).
7. Run an experiment following the General Guide.
8. Loosen the pressure valve to allow a pressure decrease of
about 3 to 4 mm Hg per second.
Calculating heart rate, systolic, diastolic, and mean arterial
pressure (MAP):
Using the NeuLog software, the systolic, diastolic, and MAP blood
pressure values can easily be calculated:
1. Conduct an experiment following the “Using the blood pressure
cuff” guide (use the "mm Hg + Arb" mode").
2. After data collection, click the “Cursors” icon underneath the
graph.
3. Highlight the region of the data that has a steady decline with
visible heart beats by placing the cursors before and after this
region.
4. Click on the sensor module box on the left of the screen. .
5. Click on the “Calculate” icon.
6. Markers for systolic, MAP, and diastolic values will appear.
7. Click on each one to see the relevant value.
Included with the sensor:
NeuLog General Guide
Blood pressure cuff attached directly to the sensor by flexible
rubber tubing
Hand pump with pressure release valve attached directly to the
blood pressure cuff
Diastolic
MAP
Systolic
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 NeuLog’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 (oC, oF, 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.
NEULOG BLOOD PRESSURE LOGGER SENSOR GUIDE
The pressure is converted into an electrical signal which separates
into DC (mm Hg) and AC (Arb.) signals. The AC signal is amplified
and added back to the DC signal to create the mm Hg + Arb. signal.
Maintenance and storage:
Never submerge the NeuLog plastic body in any liquid.
Do not allow liquid into the blood pressure sensor’s body.
After use, gently wipe away any foreign material from the blood
pressure sensor.
Store in a box at room temperature out of direct sunlight.
Warranty:
We promise to deliver our sensor free of defects in materials and
workmanship. The warranty is for a period of 3 years from the date of
purchase and does not cover damage of the product caused by
improper use, abuse, or incorrect storage. Sensors with a shelf life
such as ion selective probes have a warranty of 1 year. Should you
need to act upon the warranty, please contact your distributor. Your
sensor will be repaired or replaced.
Thank you for using NeuLog!
Flexible, simple, fast, forward thinking.
W: www.neulog.com
E: info@neulog.com
A: 850 St Paul Street, Suite 15, Rochester, NY 14605
P: 1.866.553.8536
V2015.5
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