YSI 9300 Photometer - Manual (Page 23)

20
6 CARE AND MAINTENANCE
The photometer is designed to give long and trouble-free operation. Care
must be taken, however, to avoid test solutions being spilt over the
instrument, and to prevent contamination of the instrument. Spillages or
moisture should be wiped off immediately with a dry cloth. Never use solvents
or abrasive materials to clean the instrument. Care should be taken to keep
the test chamber clean.
Cleaning the Optics
Any build-up of dirt or deposits may interrupt light transmission and affect
readings.
To clean the optics, undo the two screws to remove the optics base plate.
Gently clean the internal surfaces of the optics with a soft, non-abrasive cloth.
Deposits may be removed with a slightly dampened cotton bud. Replace the
optics base plate and re-fasten the screws.
The photometer is fitted with long-life light sources and contains no user-
serviceable components. If the instrument requires servicing or repair, contact
YSI Technical Support Department.
Service Requirement
Servicing of the photometer is essential to ensure optimum performance. To
arrange service of the instrument, contact YSI Technical Support Department
or the authorized distributor who supplied the instrument. The YSI standard
photometer service includes cleaning of the optical assembly, replacement of
any worn parts and checking/recalibration of the instrument.
Error Messages
The photometer will display an error message in the unlikely event of a
malfunction. These error messages are mainly designed to assist service staff
in diagnosing instrument faults. In the event an error message appears on the
photometer, contact YSI Technical Support Department for advice.
Error messages are coded 7 and 9 and both relate to blanking the instrument.
If you see one of these error messages, check the operating technique and
sample clarity. If you continue to get error messages, try the following:
Error 7 indicates too much light – remove the instrument from bright light and
use the light cap.
Error 9 indicates not enough light – follow ‘Cleaning the Optics’ routine.