Seametrics FT500-Series - Manual (Page 5)

Relay 1
Relay 2
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COM
NO
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Tank 1
Tank 2
Page 4
FT520-84
> FT520-84 Filter Regeneration
In Filter Regeneration Mode, the display indicates a flow rate on
the top line, and one of two configurations on the bottom line: an
accumulated total flow (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 flow
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 dis-
plays of flow rate and accumulated flow, as well as program-
mable 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 pro-
grammable 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 (min-
utes, hours, etc.).
- SET Decimal
Select none, one, or two decimal places on the flow 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 flow meter
or flow sensor puts out per gallon of liquid. It is marked on the
Model/Serial tag of Seametrics flow meters and flow sensor fit-
tings. On adjustable depth flow sensors, the K-factor must be
taken from the chart in the flow 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 20mA RATE” programs the maximum flow rate at which
the output is 20 mA full scale, at 5 V or 10 V.
- Clear Total
This function resets the accumulated total back to zero. It is un-
related to the regeneration function, and can be ignored unless
it is needed.
- SET Regeneration Volume
This is the volume (in the units you have selected; typically gal-
lons) at which the relay energizes to initiate a regeneration cy-
cle.
- 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 (Alter-
nate Relays) operation. In alternate relay mode, the first regen-
eration 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 un-
related 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 flow
rate and running total. If there is no T, the values shown are flow
rate and units remaining until regeneration. The total increases
with flow, and the regeneration quantity counts down. Use the
UP Arrow to choose the preferred display, usually regeneration
quantity.
Regeneration Initiation. When the regeneration quantity num-
ber first reaches 0, Relay No. 1 energizes for the length of time
which has been set. The regeneration quantity immediately re-
sets and begins counting down again. If alternating mode has
been selected, the next time it reaches 0, Relay No. 2 will ener-
gize, 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.
TX Flow Sensor
FT520-84
Tank 1 Tank 2
Alternating Tanks Appliction
Connections for Alternating Tanks