YSI 6 series Uživatelský manuál Strana 27

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TURBIDITYTROUBLESHOOTING
BEFORE YOU BEGIN: Update the sonde’s firmware to the version 3.08 or higher. With this update
you MUST now use a black wiper or color the back of the white wiper with a black indelible marker.
TESTING THE WIPER, PROBES BUILT BEFORE DECEMBER 2007 (07L) AND OLDER
Parking on the 6136 probe is controlled by the sonde’s ability to see the two bottom edges of the wiper.
Looking at the bottom of the wiper you should see the pad inserted between the two arms and the edges
should be exposed.
The bottom edge of the wiper arms must be visible to the infrared beam. Sediment, fouling, and even the
foam pad (if not installed properly) can get in the way. Make sure this area stays clean; use a toothbrush
to clean. The wiper must rotate twice in one direction, stop and then rotate once in the opposite
direction. If the wiper rotates in only one direction, then a problem exists that will require factory
service.
TESTING THE WIPER, PROBES BUILT IN DECEMBER 2007 (07M) AND NEWER
All optical probes built from December 2007 to current use a magnetic sensor to park the wiper. This
system also has the wiper rotate twice in one direction and then reverse for one rotation. This parking
system is unaffected by fouling and can use any wiper. It is recommended that you use black or anti-
fouling wipers with this probe. Failure of the wiper to park correctly is a sign of a malfunction and
requires repair before the probe can be used.
TESTING THE EDS & V2-4 WIPERS
The EDS and V2-4 wipers should be functionally tested just like the standard wiper. The wiper needs to
be kept clean and maintained just like the smaller one. It is critical to keep the brush bristles combed out
and straight. DO NOT ALLOW THE BRUSH TO DRY WHEN IT IS OUT OF SHAPE. The wiper will
also rotate and park twice in a forward direction and make one reversal. Again, if the wiper fails this test
and cleaning and pad replacement does not solve the problem, then service will be required.
OUTPUT TEST
The probe output can be quickly tested by holding your finger just above the optics. This will cause the
probe to read full scale > 1,000 NTU.
Note: Because of the data filter, it can take as long as 12 or more seconds to see the >1,000 NTU value
appear.
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