4 MAINTENANCE
Scheduled Maintenance
4.1 WEEKLY
• Clean the scanning probe screens. These are located on the black and red circular
scanning probe nozzles.
• Clean the gross particulate screen located at the base of the flexible scanning probe
extension.
• Remove any loose debris from the Scanning Probe and front panel sampling ports.
4.2 ANNUALLY
• Return the 2H to a factory authorized facility for calibration and cleaning. Please contact
the ATI Customer Service Department at 410-363-9696 for a return authorization number.
A service date will be scheduled for your instrument at that time.
A Return Authorization can also be obtained using ATI’s website or by sending an e-mail
requesting service information to info@atitest.com. A customer service representative will
process your information and contact you with a Return Authorization, necessary instructions and
information within 48 hours.
4.3 GENERAL MAINTENANCE PROCEDURES
The 2H Aerosol Photometer is a sturdy, solid-state electronic instrument designed to hold up
under extended field use. The only moving parts are the vacuum pump, the Selector Valve and
the ventilating fan at the rear of the chassis. Field level maintenance is limited to replacement of
the HEPA exhaust filter and the fuse. Procedures for these operations are contained in this
section.
NOTE: The internal electronics are not user serviceable. Any electronic problems must be
analyzed and repaired at an authorized service center.
At present, there is no error message or indication on the front panel that the scattering chamber
light source is not working. If the scattering chamber light source has burned out, the operator
will witness a lack of response on the unit’s % LEAKAGE display.
4.4 RECOMMENDED SPARE PARTS
Spare components are not supplied with the 2H or the 2H-N nuclear unit and must be ordered
separately. See section A-4 for a list of recommended spare parts that may be purchased in kit
form or individually. These lists include only parts replaceable by the user in the field. Other
repairs requiring instrument or component recalibration must be performed at an ATI service
center.
Revision A
20
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