UFi 1010 User manual

MODEL 1010 PIEZOELECTRIC
PULSE TRANSDUCER
UFI
545 Main Street, Suite C-2
Morro Bay, CA 93442
2
Introduction
Piezo-electric transducers convert physical activity
such as changes in force or pressure into an
electrical signal. The Model 1010 transducer is a
piezo-electric transducer designed for wide ranging
applications in the life sciences. These applications
include:
•sensing and recording peripheral pulse in
the finger;
•measuring carotid pulse;
•recording throat excursions from swallowing;
•monitoring Korotkoff sounds;
•monitoring heart sounds;
•use as a small-animal pulse and respiration
transducer;
•monitoring vibrations; and
•counting liquid drops for titrations
Step-by-step instructions are provided below for the
first five of these applications.
For any force to be measured, there must be an
opposing force against which it acts. For the Model
1010, a VELCRO® strap usually imposes this
counter-force. The Model 1010 may also be
attached with a rubber chest strap or adhesive tape.

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Cautions
The UFI Model 1010 Pulse Transducer is a rugged
instrument. However, it may be damaged unless
the following cautions are observed:
•Do not expose Model 1010 to temperatures
above 50
o
C (122
o
F).
•Do not use an ohmmeter to measure
resistance of Model 1010.
•Do not apply DC voltages to Model 1010.
These can impose large stresses that can
bend diaphragm or fracture piezo element.
•Model 1010 can produce output pulses of
several volts during handling and placement.
If connected equipment cannot handle such
inputs, Model 1010 should be disconnected
from downstream equipment until it has been
attached to subject.
Connection considerations
•Model 1010 requires that downstream signal
conditioners have an input impedance of at
least l00 KΩand a frequency response
extending below 1 Hz. A charge amplifier
connected between Model 1010 and signal
conditioner will extend low response.
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•Signals of just 4-5 mV saturate some
amplifiers. If Model 1010 does this, a simple
resistive voltage divider (see below) should
be inserted between the transducer and
instrument input. Circuit should be shielded
to prevent pickup of power line noise.
Model 1010
1M
SHIELD Output to signal conditioner
100K to divide input by 10
BLACK LEAD
10K to divide input by 100
.
Applications for the Model 1010
To use as a pulse transducer:
•attach Model 1010 to tip of any finger with
VELCRO® strap;
•lightly rest finger on transducer surface with
edge of finger slightly overlapping edge of
transducer as shown in drawing below;
•wrap VELCRO® strap around finger. Model
1010 should fit snugly but not restrict
circulation. If finger tip turns white or feels
cold, then unit is too tight.

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•Experiment to obtain best signal. Transducer
output should be at least 100-200 mV.
•Peripheral vasoconstriction, often due to a
cold subject or room, can cut the signal
greatly. Touch subject's fingers to your
cheek -- coldness indicates vasoconstriction.
•Model 1010 finger pulse signal differs from
usual pressure pulse signal due to poor low-
frequency response of transducer piezo-
electric element. Use a charge amplifier
circuit (see below) to correct response and
obtain a good pressure pulse waveform.
10K
To Model 1010
1M
22M
To signal conditioner
+
-
U2
LF411
3
26
7 4
V+
V-
47 nF
..
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To measure carotid pulse:
•place Model 1010 on one of the carotid
arteries, just below hyoid bone, and hold
there with VELCRO® strap or elastic
webbing 2.5cm (1") wide or more.
•Use minimum tension needed to obtain an
adequate signal; expect 40-60 mV.
To monitor swallowing:
•place Model 1010 on throat near base to one
side of thyroid cartilage; secure with elastic.
•Properly placed, Model 1010 should produce
several hundred millivolts during a swallow.
To monitor Korotkoff sounds:
•place Model 1010 under blood pressure cuff,
directly over brachial artery.
•Model 1010 should produce 50 mV or more
per pulse.
To monitor heart sounds:
•secure Model 1010 to chest with elastic
webbing. You will obtain best results when
Model 1010 is in direct contact with skin.
•Connect Model 1010 leads to audio amplifier
or chart recorder.

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Specifications
•Frequency response 2.5 Hz to 5 KHz
•Signal output Varies with force:
typical finger pulse
yields 20-40 mV, but
can exceed 500 mV
•Weight 14 grams (0.5 ounce)
•Size 23mm dia x 13mm high
(0.9" dia x 0.5" high)
•Cable length 1.8m (6 feet) nominal;
others by special order
Warranty and repair
All UFI instruments are warranted against defects in materials and
workmanship to the original purchaser for a period of one year
from the date of original purchase. This warranty is void if our
inspection shows the equipment has been tampered with; or
installed at variance with factory-designated procedures; or has
been subjected to negligence, misuse, or accident beyond normal
usage; or has had the serial number altered, defaced, or removed.
All questions regarding the warranty should be directed to:
Customer Service Department, UFI
545 Main Street, Suite C-2
Morro Bay, CA 93442
Email: [email protected]
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When communicating with UFI concerning your equipment,
please include the model and serial numbers.
No third party, including any dealer or agent, is authorized
to assume any liability for UFI.
UFI instruments and transducers are subject to continuous
improvement. We reserve the right to modify any design or
specification without notice and without incurring any
obligation.
ALL UFI TRANSDUCERS AND ELECTRODES ARE
COVERED BY OUR EXCLUSIVE "LIFELINE®
WARRANTY" AS OUTLINED BELOW
If your UFI transducer, electrode, or electrode tester ceases to
operate--regardless whether the cause is accidental, intentional, or
whatever---return it to us
. We will repair it or replace it with a new
one for a minimal handling charge, as listed below:
Model 1010, 1010C $25.00
Model 1020, 1020EC, 1020FC, 1110 $25.00
Model 1030, 1040, 1070, 1081FT $50.00
Model 1081 & 1081 SNP $11.00
Model 1089 MK II & MK III $65.00
Model 1130, 1131, 1132 $35.00
Prices subject to change
9-30-10