Hach Lange astroTOC Basic User Manual page 26

Maintenance
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Ozone inhalation hazard. Under certain conditions, this instrument produces ozone concentrations
above safe exposure limits. Plumb waste gases to a fume hood or to the building exterior in
accordance with local, regional and national requirements.
If loss of liquid sample occurs and the UV lamps remain on, the interior analyzer and the waste gas
line may have ozone concentrations at levels greater than 200 ppm. This ozone level is well in
excess of permissible occupational exposure limits. When opening either the upper or lower
cabinets, allow 60 seconds for any potential ozone gas build-up to dissipate before working on the
instrument.
Note: The manufacturer is not responsible for damage to the instrument caused by failure of the user to do
recommended periodic maintenance.
Maintenance schedule
Table 8 gives the maintenance schedule for the analyzer. The maintenance schedule shows the time
intervals for maintenance tasks. Maintenance tasks may need to be done more frequently depending
on the operating environment.
Maintenance task
Look for alarms or events. An indicator light is
illuminated or flashes when an alarm or event has
occurred. Refer to User interface
Look for liquid leaks and other conditions that are
not typical. Repair leaks immediately to prevent
analyzer damage.
Look at the flow meter reading for the UV reactor
carrier gas flow. Make sure that the reading is
stable and approximately the same reading that
was recorded during initial start-up.
Examine the GLS and sparger. Make sure that the
sparge gas bubbles flow correctly.
Note: The sparger on the TC version is bypassed with the
conversion.
Prepare the reagents and fill the 5-gallon
containers. (Some reagents last two months).
Calibrate the analyzer with fresh span standards.
Make sure that the pressure of the carrier gas is
sufficient. Refer to Attach a carrier gas
Examine the analyzer to see if it is dirty. Clean the
exterior of the analyzer if necessary.
Install new peristaltic pump tubing. Refer to
Replace the pump head and pump tubing
on page 29.
26 English
D A N G E R
C A U T I O N
Table 8 Maintenance tasks and schedule
on page 19.
on page 19.
Daily Monthly
X
X
X
X
X
X
X
X
Quarterly Annually
X