Set Up the Hardware
PS
-
3208
3
013-15272B
LED Information
The Bluetooth and the Battery Status LEDs operate as
follows depending on the type of connection:
For a wireless Bluetooth connection:
For a micro USB cable connection to a USB
port
:
For a micro USB cable connection to a USB
charger
*Logging: PASCO wireless sensors can either stream
live data to a compatible device for “real-time” viewing or
log data (save it to the sensor’s memory). After logging,
the data can be uploaded to the computing device for
display and analysis at a later time. Logging capability
supports long-term or remote data collection while not
connected to a device.
Set Up the Hardware
Warm-Up Time
Turn on the sensor and connect it to a computing device.
Let it come to equilibrium with the environment where it
will be used. Allow 180 seconds (3 minutes) for the sen
-
sor to equilibrate. Variations in temperature, humidity,
and air pressure can impact the calibration so equilib
-
rium with the environment is critical
Calibration
The sensor has a one-point calibration in the software
with a default value of 400 ppm (user editable). If you
have a meter that provides an accurate carbon dioxide
measurement, you may want to edit the default value. A
two-point calibration is not possible. The user can reset
to the factory calibration which is stored in the probe at
any time.
Sensor Operating Theory
Concentration of carbon dioxide is measured by non-dis
-
persive infrared (NDER) technology. The sensing ele
-
ment is a pyroelectric device that senses the carbon
dioxide gas concentration by measuring the amount of
infrared (IR) energy absorbed by CO
gas in the probe
housing. The infrared (IR) source at one end of the
probe is a lamp with a quartz envelope and a gold plated
reflector. The sensitive thermopile element at the other
end of the probe is covered with a narrow band filter that
only passes IR energy at 4.27 microns; a wavelength
that is absorbed by the CO
2
gas in the probe housing.
As concentration increases, the IR energy ‘seen’ by the
thermopile decreases.The relationship between the gas
concentration and the absorption of IR energy is similar
to that of Beer’s Law.
Storage and Maintenance
•
Do not use or store the sensor in a highly dusty
environment. Avoid direct sunlight or heat radiation.
•
Do not let the sensor get wet.
Bluetooth
LED
Status
Battery
LED
Status
Red blink
Ready to pair
Red blink
Low power
Green blink
Connected
Yellow blink
Logging*
Bluetooth LED Status
Battery
LED
Status
OFF
--
Yellow ON
Charging
OFF
--
Green ON
Charged
Yellow blink
Logging*
Bluetooth
LED
Status
Battery
LED
Status
Red blink
Ready to pair
Yellow ON
Charging
Green blink
Connected
Green ON
Charged
Yellow blink
Logging*
Rubber collar
Sample bottle
and cap
CAUTION: Do not wash
the sampling bottle in a
dishwasher or autoclave.
It will melt.
