Casella CEL Microdust Pro real time dust monitor - Manual (Page 15)

MicroDust Pro Aerosol Monitoring System
15 Casella CEL
USB supply
When you connect the instrument to a PC through a USB cable, the instrument
receives power to operate at 5 V DC from the PC. There is no need to use a
mains DC power supply to operate the MicroDust Pro instrument when you
connect it to a PC.
Battery condition indicator
When the MicroDust Pro receives power from a mains DC power supply or
from a USB port on a PC, the battery condition symbol on the instrument’s
screen always shows a fully charged battery condition, even if the batteries are
not fully charged.
Sampling probe
IMPORTANT
The instrument may give reading errors when you use it in very bright or changing
ambient light conditions. This is because the measurement method depends on the
scattering of infra-red light.
You should exercise care when you use the instrument in direct sunlight. Shield the
probe from direct light sources. You can use an aspirated or gravimetric adaptor, or
use the MicroDust Pro within the environmental enclosure to reduce the effects of
ambient light.
The detachable sampling probe houses the measurement chamber together
with the associated optics, including the infra-red emitter and receiver.
Connect the sampling probe by aligning the red dot on the connector to face
forward on the instrument, and insert the connector into the socket at the top of
the instrument.
To disconnect the sampling probe
CAUTION
DO NOT pull on the cable to disconnect the sampling probe.
To disconnect the sampling probe, pull outwards on the connector’s knurled
sleeve in the direction of the arrows shown in Figure 2.
You can un-clip the sampling probe from the control unit for hand-held
operation.
Supporting the instrument
For general monitoring applications you can attach the instrument to a suitable
tripod (available from Casella CEL).