PASCO CI-6535 User Manual

Instruction Sheet for the
PASCO Model
CI-6534A and CI-6535

CI-6534A LOW PRESSURE SENSOR (0-10kPa)

CI-6535 RESPIRATION RATE SENSOR

012-07034A

3/99

$1.00

polyurethane

tubing

quick release

connectors (4)

pressure port

connector

Introduction

The PASCO Model CI-6534A Low Pressure Sensor
(0-10kPa) is a pressure sensor that is designed to be
used with a PASCO computer interface. This low
pressure sensor is ideally suited for use with the
PASCO Respiration Belt or the PASCO Heat Engine
Apparatus.

syringe

10 kPa MAX

DRY AIR ONLY

PRESSURE PORT MATING

PASCO PART NO. 640-021

cable with DIN

connectors

to computer

CONNECTOR:

CI-6534A

LOW

a

PRESSURE

P

k

)

SENSOR

0

E

1

G

­U

0

A

G

(

Pressure Sensor

unit

sensor unit. It has a “quick-release” style connector for
attaching accessories such as the PASCO CI-6535
Respiration Belt accessory (which includes a Low
Pressure Sensor). The pressure sensor gives a reading
of “zero” when there is no pressure difference between
the internal reference port and the external pressure
port connector.

interface

CI-6534A Low Pressure Sensor

The low pressure sensor consists of the electronics
box with a cable that has a DIN plug for connecting to
a PASCO computer interface. The pressure sensor
uses a 10 kiloPascal transducer. This type of
transducer has two ports. The reference port of the
transducer is inside the electronics box. It is always
open to the atmosphere and not available to the user.
The other port is connected to the atmosphere via the
pressure port connector at the front of the pressure

The transducer is durable, but it is designed to be used
with non corrosive gases such as air, helium, nitrogen,
etc. Do not let the transducer get wet. The maximum
short-term pressure that the sensor can tolerate without
permanent damage is about 100 kPa (14 psi). Please be
careful to not apply high pressure to the sensor.

The electronics box contains a precision operational
amplifier (op amp) that can drive a heavy capacitive

© 1999 PASCO scientific

Respiration Rate Sensor 012-07034A

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.

ADDITIONAL REQUIRED

• computer (PC or Macintosh)

• Science Workshop

• Science Workshop

®

computer interface

®

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

G

X

N

Y

I

1

L

T

A

2

A

N

0

M

-

M

:

0

O

a

T

R

4
6

R

P

O

R

.

I

T

O

k

O

C

P

A

0

N

E

E

1

Y

N

T

R

N

R

R

U

A
O

S

D

P

C
S
E

O

A

R

C

P

S

4

A

3

P

5

6

­I

C

E

W

R

O

U

L

S

R

S

O

E

S

R

a

N

P

P

E

k

)

S

0

E

1

G

­U

0

A
G

(

Figure 1

Respiration Rate Sensor

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)

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)

2