Controls and Set Points
HIGH SET:
Turn the rotary switch to
HIGH SET
and adjust the
HIGH SET
pot (on the right
side of the controller) to the level you select as a cut off point. This adjustment can be
made with a small screwdriver. This set point must be Higher than the
LOW SET
in order
for the Low- High relay to operate.
LOW SET
: Turn the rotary switch to
LOW SET
and adjust the
LOW SET
pot (on the lower
right corner of the controller) to the level you select as the first relay cut on point. This
adjustment can he made with a small screwdriver. This set point must be Lower than the
HIGH SET
in order for the Low-High relay to operate.
SET 2
is a back up relay for auxiliary equipment in case the oxygen level keeps falling.
This relay has one setting, the
HIGH SET
will act as the cutoff.
SET 3
operates the same as
SET 2
and can be used for back up if the oxygen levels keep
decreasing or an alarm.
OPERATION
: Turn the rotary switch to the
DO
position and the system will operate
automatically in accordance with the setting you have selected.
NOTE: If 4-20 mA output
is being monitored by a computer or data logger, etc. The rotary switch must be in
the D.O. position. The relay set points are not affected by the position of the rotary
switch.
Section 3 Introduction to Calibration
After installing the unit, allow the sensor 2 or 3 days in its new environment to stabilize
before calibrating. The Fluoroprobe
TM
is very stable and the longer it stays in the water,
the better. The Fluoroprobe
TM
is calibrated before shipping to a known zero (0) ppm
standard, and air saturated water (8.47 D.0. @ 20
o
C / 3000ft). Generally, the Fluoroprobe
will not require calibration after installation, however, it is recommended to check the
calibration at first use.
The operator should take D.O. readings with their hand held probe over the first few days
at the location where the probe is installed. It is important that several days of readings
with your handheld be observed before you make any adjustments to the Fluoroprobe
TM
.
The best thing to do if the units' readings appear odd is to do nothing and investigate
thoroughly before making any adjustments. If your operation range is from 4.0 ppm down
to 0.0 ppm, you should calibrate to a portable meter or a know standard in that range.
Always use the
ZERO
calibration pot to make adjustments below 4.0 ppm. When the
range is from 4.0 ppm and higher or you are calibrating to ambient air, use the
AIR
calibration pot only.
Note-. If air calibrating, allow thirty (30) minutes or more to stabilize the unit before
comparing readings or making any adjustments.
If the FL-2 reads zero (0.0) ppm,
check the oxygen level with a handheld and then check the probe for trash blockage
and/or clean the probe sensor with a small toothbrush. If the display stays at 19.90 all the
time the unit has other problems and should be sent back to the manufacturer.
You may
give us a call anytime for help - please see the back of the manual for the telephone
number.
