Respiration Rate Sensor
012-07034A
2
load, such as a six meter extender cable (CI-6515).
There is a resistor in parallel with the transducer to
compensate the sensor for temperature induced
variations. The sensor has a negative temperature
coefficient (resistance decreases as temperature
increases) and the resistor has a positive temperature
coefficient.
CI-6535 Respiration Rate Sensor
The CI-6535 Respiration Rate Sensor consists of
the CI-6534A Low Pressure Sensor and the
PASCO Respiration Belt (003-05936). See Figure
1.
The belt has the following features:
• hook-and-pile strips sewn onto opposite ends of
the belt
• attached squeeze bulb for inflating the rubber
bladder inside the belt
• quick-release connector that can be attached to the
pressure port on the Low Pressure Sensor.
Equipment
INCLUDED
• Low Pressure Sensor (Gauge) unit
• quick-release connectors (4)
• polyurethane tubing (0.6m)
• plastic syringe (20cc, calibrated)
ADDITIONAL REQUIRED
• computer (PC or Macintosh)
• Science Workshop
®
computer interface
• Science Workshop
®
software version 2.2 or
higher
ADDITIONAL RECOMMENDED
• Respiration Belt (PASCO part no. 003-05936,
included in the CI-6535 Respiration Rate
Sensor)
• Heat Engine/Gas Law Apparatus (PASCO
part no. TD-8572)
Extra parts are available as follows:
Item
Part Number
plastic syringe
699-084
polyurethane tubing
640-023
quick-release connector
640-021
Respiration Belt
003-05936
Range and Resolution
The range of the CI-6534A Low Pressure Sensor is
between 0 and 10 kiloPascals. The resolution of the
sensor is 0.005 kiloPascals (kPa) when used with a
PASCO computer interface. The output voltage from
the sensor is +1.00 Volts when the pressure is 1
kiloPascal (kPa), and the output voltage is linear.
Therefore, the output voltage should be +10.00 Volts
at the top of the range (10 kPa). Atmospheric pressure
is normally around 101.326 kiloPascals (kPa).
Pressure can be measured in many different units (e.g.,
atmospheres, inches of mercury, millimeters of
mercury, kiloPascals, Bar, pounds per square inch).
Some equivalent values for pressure are:
1 atmosphere = 30.00 in of Hg (at 16ºC)
= 760 millimeters of Hg
= 101.326 kiloPascals (kPa)
= 1.013 Bar = 1013 milliBar
= 14.696 pounds per square inch (psi)
10
kP
a M
AX
DR
Y A
IR
ON
LY
PR
ES
SU
RE
PO
RT
MA
TIN
G
CO
NN
EC
TO
R:
PA
SC
O P
AR
T N
O.
640
-02
1
LO
W
PR
ES
SU
RE
SE
NS
OR
0-
10
kP
a
(G
AU
GE
)
CI-
65
34
A
Figure 1
Respiration Rate Sensor
