012-07034A
Respiration Rate Sensor
3
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 2). Alternatively, the unit
can be plugged directly into the analog channel
jack.
2. Connect the quick release connector to the
pressure port connector on the Pressure Sensor
unit.
The sensor is temperature compensated, therefore
changes in room temperature will not interfere with
the data.
Using the Syringe and Quick-Release Connectors
The Pressure Sensor is designed for experiments such
as those that study the gas laws or for the rate of a
chemical reaction by monitoring the increase or
decrease in pressure. For example, Boyle’s Law is a
classic physics (and chemistry) concept that can be
demonstrated using the sensor and the syringe. See
Figure 3.
To connect the syringe to the sensor, cut a short length
of tubing (about one inch). Put the “barb” end of one
of the quick-release connectors into one end of the
short piece of tubing. Put the other end of the tubing
over the tip on the end of the syringe.
Note: You can lubricate the end of the barb to make it
easier to put into the short piece of tubing. Put a very
small amount of silicon oil or saliva onto the barb
and then wipe the barb with a cloth so there is only a
thin layer of lubricant on the barb.
Align the quick-release connector with the pressure
port connector of the sensor. Push the connector onto
the port, and then turn the connector clockwise until it
“clicks” into place (less than one-eighth of a turn).
The barb of the quick-release connector is free to
rotate even when the connector is firmly attached to
the port. See Figure 4.
10
kPa
M
AX
DRY
AI
R O
NLY
PRE
SSU
RE P
ORT
MA
TIN
G
CO
NNE
CTO
R:
PAS
CO
PA
RT N
O. 6
40-0
21
LOW
PRESSU
RE
SENSO
R
0-10 kPa
(GAU
GE)
CI-6534A
Figure 2
Connecting the amplifier box to the interface box
5
10
Figure 3
Using the syringe
barb
quick release
connector
tip
tubing
Figure 4
Using the quick release connectors
Push the connec-
tor onto the
pressure port. Turn
the connector
clockwise until it
“clicks” (less than
1/8 turn).
pressure port
connector
quick release
connector
tubing
