TSI Instruments DustTrak 8520, Operation And Service Manual, Page: 77 / 89

Maintenance 67
Maintenance
Daily Maintenance Checks
The D
UST
T
RAK
monitor should be checked a minimum of once a day to
change the battery pack and make sure the instrument is operating properly.
A visual inspection of the instrument and case can ensure that the water trap
is empty, the sampling inlet is unobstructed and the tubing is not kinked.
Cleaning the Aerosol Inlet
Under normal operating conditions, the external aerosol inlet will remain
clean and unobstructed. Under very dirty conditions; however, the inlet may
become obstructed with vegetative debris or insects. To ensure the inside of
the aerosol inlet is clean, periodically blow compressed air through the
bottom of the inlet.
!
C a u t i o n
Do not disassemble the Environmental Enclosure aerosol inlet
for any reason. It is not designed for field service and
reassembly.
Cleaning the Respirable Aerosol Inlet
Follow the same procedure found in Chapter 4 of this manual in the section
entitled “Cleaning the Cyclone.”
When to Change the Battery
The battery packs are designed to provide power to the D
UST
T
RAK
monitor
for a minimum of 24 hours, even under cold ambient conditions. To ensure
uninterrupted operation, the packs should be replaced daily. If a battery pack
has been forgotten and left connected to a running D
UST
T
RAK
monitor
,
the
extended-life battery will automatically quit delivering current to the
D
UST
T
RAK
monitor after its voltage drops below 5.1. At this point the
internal, C-cell battery pack automatically switches over and begins
powering the D
UST
T
RAK
monitor with no loss of data.
Note: An internal battery backs up the D
UST
T
RAK
monitor memory. The
logged data will not be lost even if both battery packs lose power.
Replacing the Battery Pack
When changing the battery pack, you do not have to interrupt the sampling
process as long as fresh batteries are installed in the D
UST
T
RAK
monitor’s
internal battery compartment. Replace the discharged external battery with
the newly charged one, taking care to secure the fully charged battery with
the Velcro strap. When closing the case make sure that the tubing does
not
become kinked. Pull the tubing in front of the battery bracket while closing