7
GENERAL OPERATING PROCEDURES
DISK HANDLING
The disk should be handled only by the edges. Avoid
touching the top or bottom of the disk. The light passes
through the non-frosted areas of the disk so these areas
must be kept free of smudges and
fi
ngerprints. Wet disks
should never be placed in the meter. Wet disks should be
dried with a lint-free cloth before placing them into the
chamber.
The disk is positioned in the chamber by aligning the
D-shaped hole in the center of the disk over the D-shaped
hub in the photometer chamber. The disk should be
placed gently on the hub. There is no need to
fi
rmly press
the disk down onto the hub. Universal disk cover should
then be placed over the disk before running the test.
DISK STORAGE
Disks are sensitive to moisture and UV light. Avoid
opening more packs than are needed. Disks have
a limited shelf life and should not be exposed to the
humidity in the air more than necessary.
Do not transport the meter with a disk in the chamber.
Store disks at 70°-80 °F (21°-27 °C).
METER
When a
fi
lled disk is placed in the chamber with universal disk cover and the lid
is closed, the meter spins at high speed to distribute the sample to the test wells.
Next the meter slows to maximize the pumping action of the stainless steel mixing
beads as the reagents mix with the sample water. Each reaction is then read at
the proper time and wavelength for that reagent system.
The button located in the lower center of the top of the meter
turns the instrument on and off.
The blue on/off button indicator light indicates the status of the instrument.
Steady blue light
– the blue LED will remain steady to indicate that the meter is on
and ready to run a test.
Blinking blue light
(three blinks/second) – a test is in progress and the disk is
spinning. Do not open the lid when the disk is spinning.
Care should be taken when closing the lid. Do not slam the lid. Wiring between the
lid and the body of the photometer passes through the hinge. The meter will not
run with the lid open.
Summary of Contents for AP-3580
Page 1: ...Simple Precise Digital Water Testing...
Page 2: ...2...
