
FT500 INSTRUCTIONS
Seametrics • 253.872.0284 Page 7 seametrics.com
Relay 1
Relay 2
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COM
NO
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Tank 1
Tank 2
FT520-84 Filter Regeneration
In Filter Regeneration Mode, the display indicates a ow
rate on the top line, and one of two congurations on the
bottom line: an accumulated total ow (resettable), or batch
process remainder. The regeneration process is initiated by
setting a target volume, a value for regeneration time as
well. A single relay or alternate relay setting allows control
of either single tank or alternating dual tank systems.
On the input side, this model can be used with Seametrics
ow sensors and meters, as well as with water meters
from other manufacturers. The output can be used to
initiate regeneration in a variety of one-tank and two-tank
water treatment systems. In addition to the regeneration
functions, this unit features displays of ow rate and
accumulated ow, as well as programmable pulse output
and a 4-20 mA analog output, for use with remote recorders.
There are two regeneration relays, which can be used for
alternating regeneration of two tanks. The outputs remain
on for a duration programmed by the user, depending on
the requirements of the regeneration valve being used.
A programmable pulse output can be used as needed to
control a chemical metering pump, for controlled chemical
addition to the water stream.
Settings
Use Left Arrow and UP Arrow keys to change settings. Press
SET to advance to next menu.
- SET Flow/Rate
Select the particular volume unit desired (gallons, liters, etc.).
Then switch to time units and select the time unit desired
(minutes, hours, etc.).
- SET Decimal
Select none, one, or two decimal places on the ow units.
- SET K-Factor
The unit will not function properly until this number is entered.
The K-factor is simply the number of pulses which the ow
meter or ow sensor puts out per gallon of liquid. It is marked
on the Model/Serial tag of Seametrics ow meters and ow
sensor ttings. On adjustable depth ow sensors, the K-factor
must be taken from the chart in the ow sensor instructions,
based on pipe size.
- SET Pulse (scaled) Output 1
An output pulse is activated at the selected volume intervals if
this feature is in use. If a pulse output is not needed, pulse out
does not need to be set.
- SET Pulse (scaled) Output 2
An output pulse is activated at the selected volume intervals if
this feature is in use. If a pulse output is not needed, pulse out
does not need to be set.
- SET 20 mA Rate
The “SET 20 mA RATE” programs the maximum ow rate at
which the output is 20 mA full scale, at 5 V or 10 V.
- SET Regeneration Volume
This is the volume (in the units you have selected; typically
gallons) at which the relay energizes to initiate a regeneration
cycle.
TX Flow Sensor
FT520-84
Tank 1 Tank 2
Alternating Tanks
Application
Connections for
Alternating Tanks
SETTINGS AND OPERATION
- SET Regeneration Time in seconds (3 digits)
This is the length of time in seconds, the relay remains energized
to initiate regeneration. Enter a value slightly over the minimum
time required by the regeneration valve to begin a cycle.
- SET Relay Mode to one or alternate relays
Choose between single relay (Relay No. 1) and dual relay
(Alternate Relays) operation. In alternate relay mode, the rst
regeneration will use Relay 1, the next will use Relay 2, and
successive regenerations will switch between the two.
- Clear Total
This function resets the accumulated total back to zero. It is
unrelated to the regeneration function, and can be ignored
unless it is needed.
Operation
Choice of Displays. When all of the settings have been
entered, the next press of the SET Key puts the unit in
operation. If a T appears at the left side of the display, the
values shown are ow rate and running total. If there is
no T, the values shown are ow rate and units remaining
until regeneration. The total increases with ow, and the
regeneration quantity counts down. Use the UP Arrow to
choose the preferred display, usually regeneration quantity.
Regeneration Initiation. When the regeneration quantity
number rst reaches 0, Relay No. 1 energizes for the length
of time which has been set. The regeneration quantity
immediately resets and begins counting down again.
If alternating mode has been selected, the next time it
reaches 0, Relay No. 2 will energize, and the cycle after
that, will return to Relay No. 1. An output can be manually
forced at any time by pressing the Start/Stop key. The relay
will energize for the set time, and regeneration volume will
return to its original setting to begin counting down again.