PASCO CI-6532A User Manual
Instruction Sheet
for the PASCO
Model CI-6532A
PRESSURE SENSOR - ABSOLUTE
012-06859B
10/98
$1.00
(0 TO 700 kPa)
polyurethane
tubing
quick release
connectors (4)
pressure port
connector
Introduction
The PASCO Model CI-6532A Pressure SensorAbsolute is designed to be used with a PASCO
Science Workshop
6532A includes the pressure sensor unit,
extension cable with 8-pin DIN connectors, quick
release connectors, polyurethane tubing, and a
syringe.
The pressure sensing element in the pressure
sensor unit has two pressure ports. One port is
connected to the atmosphere via the pressure port
connector at the front of the pressure sensor unit.
The other port is internal to the pressure sensing
element and is sealed with a reference vacuum.
The sensor element is designed to be used with
non-corrosive gases such as air, helium, nitrogen,
etc. Do not expose the sensor to liquids.
®
computer interface. The CI-
syringe
700 kPa MAX
DRY AIR ONLY
CONNECTOR:
PRESSURE PORT MATING
PASCO PART NO. 640-021
Equipment
cable with DIN
connectors
CI-6532A
PRESSURE
SENSOR
0-700 kPa
(ABSOLUTE)
Pressure Sensor
unit
INCLUDED
• Pressure Sensor (Absolute) unit
• quick-release connectors (4)
• polyurethane tubing (0.6m)
• plastic syringe (20cc, calibrated)
ADDITIONAL REQUIRED
• computer (PC or Macintosh)
• Science Workshop
• Science Workshop
higher
Extra parts are available as follows:
Item Part Number
plastic syringe 699-084
polyurethane tubing 640-023
quick-release connector 640-021
to computer
interface
®
computer interface
®
software version 2.2. or
© 1998 PASCO scientific
Pressure Sensor - Absolute (0 to 700 kPa) 012-06859B
T able 1
Pressure range comparison
kiloPascals inches of Hg mm of Hg Bar pounds/sq in atmospheres
700.00 207.25 5250.4 6.999 101.48 6.908
101.32 30.00 760.0 1.013 14.69 1.000
Range and Resolution
The range of the CI-6532A Absolute Pressure
Sensor is between 0 and 700 kiloPascals (or 0 to
6.9 atmospheres). 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)
The top of the range of pressure expressed in these
equivalent units is as in Table 1.
The maximum short-term pressure that the sensor
can tolerate without permanent damage is about
1,000 kPa (150 psi). Please be careful to not apply
high pressure to the sensor.
The sensor box contains a precision operational
amplifier (op amp) that can drive a heavy
capacitive 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.
Operation
Setting up the Equipment
1. Connect the Pressure Sensor unit to analog
channel A, B, or C of the Science Workshop
computer interface box using the cable with
the DIN connectors (Figure 1). Alternatively,
the unit can be plugged directly into the
analog channel jack.
The output voltage from the sensor is +1.00 Volts
when the pressure is 100 kiloPascals (kPa), and the
output voltage is linear. Therefore, the output
voltage should be +7.00 Volts at the top of the
range (700 kPa). The resolution of the sensor is 0.5
kPa (when used with a PASCO computer
interface). This resolution translates into other
pressure units as follows:
Units Resolution
inches of Hg 0.148
mm of Hg 3.750
milliBar 5.088
pounds per square inch (psi) 0.072
atmospheres 0.004
(ABSOLUTE)
0-700 kPa
SENSOR
PRESSURE
CI-6532A
CONNECTOR:
PASCO PART NO. 640-021
PRESSURE PORT MATING
DRY AIR ONLY
700 kPa MAX
Figure 1
Connecting the amplifier box to the interface box
2
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