Page 1
FT500-Series
FLOW COMPUTER
INSTRUCTIONS
• FT520
• FT522
F T 5 0 0 - S E R I E S F L O W C O M P U T E R I N S T R U C T I O N S
Page 2
Page 1
GENERAL INFORMATION, FEATURES, DIMENSIONS, SPECIFICATIONS
FEATURES
Setting Keys
Cover Screws*
Indicator Lights
The FT500-Series is a batching flow processor with additional
output controls. It is designed for use with Seametrics flow
meters and flow sensors, as well as other manufactuer’s
products which have frequency output proportional to flow.
In addition to batch functions, the FT500-Series indicates
flow rate, and other data in large 3/8” (9.66 mm) digits on
an easily-read, backlit display. Units of measure are user
selectable, and range from milliliters per second to millions
of gallons per day. The unit can be 110 Vac powered with a
standard 3-wire cord (included), 220 Vac powered (optional),
or DC powered through an internal terminal strip (battery not
included).
An analog output of 4-20 mA is available both in active and
passive loop configuration, and in 0-5 Vdc or 0-10 Vdc outputs,
and can be used in applications such as flow rate logging. Two
programmable pulse scaled outputs are also standard, and
can be used, for example, to provide proportional chemical
feed with a pulse-responsive metering pump.
The housing is supplied with two brackets for wall-mount
applications, or the top/bottom housings can be easily
separated and reassembled for panel-mount.
*Can be ordered cross-drilled for seal wire
Display
115 Vac, 50/60 Hz @ 125 mA, (220 Vac optional), 12 Vdc @ 750 mA
32˚ - 130˚ F (0˚ - 55˚ C)
Precision cast aluminum, NEMA 4X, panel or wall mount configuration
Two form C (SPDT) relays, 115 Vac 6A max
100 mA at 60 Vac/Vdc, opto-isolated, open-collector
Non-volatile EEPROM with auto-backup
12 Vdc, 10 mA
Totalizer = 8 digit Rate = 5 digit, backlit
Volume = Gallons, cubic feet, cubic meters, millions of gallons, milliliters, fluid ounces, pounds, liters
Time = Seconds, minutes, hours, days
4-20 mA passive opto-isolated; 4-20 mA active; 0-5 Vdc, or 0-10 Vdc
1-1000 Hz, ESD protected, interfaces to current sinking sensor output
NEMA 4X
Non-volatile EEPROM, auto-backup
Power
Temperature
Enclosure
Batch Outputs
Max Pulse Output
Memory Type
Sensor Power
Display
Units
Analog Output
Sensor Input
Environmental
Setup Memory
SPECIFICATIONS*
*Specifications subject to change • Please consult our website for current data (www.seametrics.com).
6.42"
6.42"
1/2" NPT
5.67"
DIMENSIONS
4.65"
1/2" NPT
5.67"
Page 3
•
•
SEN1
–G
SEN2
Alternate
DC power
Customer Supplies
1A Fuse
Pulse 1
Pulse 2
Pulse Outputs
(for metering pumps)
Regeneration Outputs
AC Power
Relay 1
Relay 2
Main power fuse
250mA
Line
Neutral
Ground
Ribbon connector
from display board
Resume
Start/Stop
Remote
Controls
NO
COM
NC
NO
COM
NC
Resume
COM
BATCH
+12
Power
Signal
Ground
RED
WHITE
BLACK
Meter
Dry contact
0-5 V or
0-10 V or
4-20 mA
Analog Switch*
Analog Header
A
+
-
B
Active
Passive
Jumpers
A
P
5V
10V
4-20mA
An Output
110 Vac
Jumpers
220 Vac
Jumper
*Consult Seametrics before
changing from factory pr eset
Batch Control Connection (if used). Connect the valve or
other device(s) to be controlled for star ting and stopping the
batch to the appropriate relay terminals. Note: if the staged
shutoff (“prewarn”) will not be used, connect to relay one
only. Relay 1 remains energized for the entire batch cycle. If
a staged shutoff is desired, connect the main valve to Relay
2 (early shutoff) and the low-flow valve to Relay 1.
Monitor Alarm Connection (if used). Connect the alarm
devices to the appropriate relay terminals. Note that the
relays have both normally-open (NO) and normally-closed
(NC) contacts.
Analog Connection (if used). This output can be configured
4-20 mA, 0-5 V or 0-10 V by placing a jumper in the correct
position on the analog header. The analog switch next to
the header selects active (powered) or passive (unpowered)
output. NOTE: Consult factory to change internal firmware
when changing switch position. When using the 12 Vdc
powered input you may only select passive output.
Power Connection. Connect AC or DC power as desired
to the appropriate terminals. For safety, if using AC power,
be sure to connect the ground terminal provided to a good
earth ground. If using 12 Vdc, use a 12 Vdc 500 mA power
supply. Replace the front panel, taking care to reconnect
the ribbon cable if it has been disconnected. When power
is switched on, the display should light up immediately with
meaningful letters or digits.
5.50"
gasket
PANEL
CUTOUT
5.50"
6.03"
6.03"
1/4" holes (4 required)
.375"
INSTALLATION, REPAIR, CONNECTIONS
Page 2
Caution: Always disconnect power to the
unit before opening the teminal cover. Do
not reconnect power until all connections
have been made and the teminal cover has
been replaced.
PANEL CUT-OUT
Wall Mounting. Using the four screws provided, attach
the two foot brackets to the sides of the enclosure. Then
attach the unit to any secure surface by inserting screws
through the mounting holes in the foot brackets.
Panel Mounting. Follow the dimensions given for “Panel
Cutout”. Be sure to include the four corner screw holes.
After cutting and drilling, place the front plate on the front
side of the panel with its gasket against the panel, and the
remainder of the square housing on the back side. Slide
the screws through the four holes drilled in the panel, and
into the threaded holes in the housing. Tighten until the
gasket is firmly compressed against the panel.
Expose Terminals. Remove the four screws which hold the
front plate to the lower housing flange. Remove front plate.
The display board is attached to this front plate. It is also
connected to the power board by a ribbon cable. This cable
can be disconnected while making connections. Connections
can be made inside the enclosure, or the terminals can be
unplugged by gentle tugging for easier access.
Caution: When the control is powered up, relay or analog outputs may be present. If this
could be a hazard, wait to make external connections until programming is complete.
Repair
The only field-repairable component on the FT520 is the
fuse. If failure is due to a cause other than a blown fuse,
it is necessary to replace the entire board stack. Contact
your distributor for information.
Connections
Sensor Connection. Follow the “Connections” diagram to
connect either two or three wires from the flow meter or
flow sensor.
Page 4
> FT520 Batch Controller
In Batch Processing Mode, the display indicates a flow rate
on the top line, and one of three user-selectable configurations on the bottom line: an accumulated total flow (resettable), accumulated batch flow, or batch process bar
graph. The batch output is controlled via two relays. The
main relay star ts and stops the batch as a set, or the
auxiliary “prewarn” relay can be used to operate a second
valve. This allows increased accuracy by engaging a staged
shut off at the end of the batch.
Settings
Use left arrow and up arrow keys to change settings. Press
SET to advance to next menu.
- SET Batch Size
Set the batch size for the desired number of units. If the
staged shut-of f feature is not being used, this is the only
setting required for the batch.
- SET Prewarn Size
This is only used for a staged shut-off. The number set is
the number of units early (before the end of the batch) that
Relay 2 will shut off.
- 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 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 fittings. 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 unrelated to the regeneration function, and can be
ignored unless it is needed.
Operation
Start Batch. Pressing the Start/Stop key starts the batch
by energizing Relay 1. The indicator for Relay 1 will light,
indicating normal operation. The indicator for Relay 2 may
also light, depending on the prewarn setting. If staged
shut-off is being used, the Relay 2 indicator light should go
out before the end of the batch, at the prewarn set point.
The batch will continue on to the set amount unless it is
halted in the middle of the process by pressing the Start/
Stop key again.
Stop Batch/Resume Batch. Pressing the Start/Stop key
anywhere in the batch will stop it. It will remain stopped
until the Resume key is pressed. Pressing the Star t/Stop
key again allows the batch to restart from zero.
Choice of Displays for Batching. When in Operation Mode,
press the UP Arrow to change the type of display. Running
Totalizer (“T”) accumulates a Total Flow until it is reset.
Batch (“B”) accumulates the flow of the present batch only,
then resets. Bar Graph (“❚”) graphically indicates from left
to right, how much of the batch has already accumulated.
Page 4
FT520
STAGED SHUT-OFF APPLICATION
TX Flow Sensor
High-Fl
ow
Valve
Low- Flow
Valve
Tank
FT520
Staged shut-off
at end of batch
High-Flow Valve
Low-Flow V
alve
Relay 1
Relay 2
NC
COM
NO
NC
NO
COM
Po
we
r
Source
+
-
CONNECTION FOR STAGED SHUT-OFF
Page 5
Relay 1
Relay 2
NC
COM
NO
NC
NO
COM
Tank 1
Tank 2
Page 5
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 displays of flow rate and accumulated flow, 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 par ticular 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 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 fittings. 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
unrelated 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
gallons) at which the relay energizes to initiate a regeneration
cycle.
- 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 first
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 en-
tered, 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 number first 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.
TX Flow Sensor
FT520-84
Tank 1
Tank 2
Alternating Tanks Appliction
Connections for Alternating Tanks
Page 6
> FT520-86 Flowrate Alarm
In Flowrate Alarm Mode, the display indicates a flow rate
on the top line, and on the bottom line, an accumulated
total flow (resettable). The user sets a minimum and maximum flow rate, and if the flow exceeds the min/max paramenter, Relay 1 or Relay 2 will close. The output relay will
stay latched until the flow rate increases/decreases back
between the min/max settings.
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 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 fittings. 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.
- SET Low Flow Alarm
Set the desired minimum flow rate at which you want an
alarm to occur. Low alarm corresponds to alarm Relay 1
(see Connections diagram).
- SET Hi Flow Alarm
Set the desired maximum flow rate at which you want an
alrm to occur. High alarm corresponds to alarm Relay 2
(see Connections diagram).
- Clear Total
This function resets the acccumulated total back to zero.
NOTE: The “Star t/Stop” and “Resume” keys are not used
in flow alarm mode.
Operation
The last press of the key returns the unit to operation
mode.
Flow Monitoring. The flow rate and accumulated displays
begin showing current data. The accumulated total increases indefinitely unless it is reset.
Alarms. Alarm Relay 2 activates when flow reaches the
high alarm set point. Because of the built-in hysteresis, the
relay does not deactivate until the flow rate has reached
10% below the high alarm set point. Similarly, alarm Relay
1 activates when flow reaches the low alarm set point, and
does not deactivate until flow returns to 10% above the low
alarm set point.
FT520-86
NC
COM
NO
NC
NO
COM
Alarm 1
Alarm 2
-Autodialer
-Pump
-Alarm
-Valve Shutoff
Page 6
Page 7
> FT522 Usage Monitor
In Usage Monitor Mode, the display indicates one of two
configurations: an elapsed time and elapsed flow, or a flow
rate and accumulated total flow (resettable). A time period is set to monitor for a set maximum total flow. If the
total flow is reached within the set time, an output relay
is closed. The output relay stays latched until the system
either resets automatically after the set time, or is reset
manually via the StartStop button. A reset condition clears
the elapsed time and flow, but not the accumulated total
flow.
The FT522 is a flowmeter monitor with added output and
alarm features. It is designed for use with Seametrics flow
meters and sensors, as well as other units which have a
pulse or frequency output. It displays flow rate and total in
large digits on an easily-read backlit display. Units are user
selectable between gallons, cubic feet, and cubic meters.
The primar y output of this unit is a user-set alarm relay
which signals excessive total flow within a given time period (up to 48 hours). This is typically used to detect an
elevated usage level in a cooling tower or potable water
application. The dual relays can be connected to an alarm,
autodialer, or any other switch-controllable device. In addition to the usage alarm, the FT522 has analog output
(4-20 mA, 0-5 Vdc or 0-10 Vdc) and programmable pulse
output. These can be used with an external data logger or
to provide proportional chemical feed, using an externallycontrolled metering pump.
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 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 fittings. 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 Time Period from 01-48 hours
This is the monitoring period at the end of which the unit
will alarm if total flow has exceeded its setting. Set this
monitoring period for 01-48 hours. NOTE: that if the digit to
the right is set to “9”, the digit to the left will only go to “3”
This is because 48 is the maximum setting allowed.
- SET Alarm Reset
Set to automatic or manual.
- SET Alarm Point in Flow (8 digits)
This is the maximum total flow allowed in the time period
set above. Use the same procedure as above to set this
value, up to eight digits. The units are those previously
chosen.
- 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 in
the rate/total configuration. It does not affect the data in
the elapsed time/flow configuration.
Operation
The last press of the key returns the unit to operation
mode. In this mode, pressing either arrow key will toggle
back and forth between two displays, one for flow monitoring and the other for usage monitoring.
Usage Alarm. Pressing the Star t/Stop key will start the
clock and zero the total of the usage monitor. The clock
will increase and the total will accumulate (provided there
is flow) until the end of the monitoring period. At that time,
the usage total and clock will zero automatically and the
cycle will star t over. If the usage total ever reaches its
alarm point within the monitoring time, the usage alarm
relays will energize and remain on until the Resume key is
pressed. If the Resume key is pressed during a monitoring
cycle, it will freeze the cycle at its current point. Pressing it
again allows the cycle to resume where it left off.
Flow Monitoring. The “Rate” indication gives the current
rate of flow. “Total” is a running total of flow which increases indefinitely unless it is reset.
NC
COM
NO
NC
NO
COM
Main
power fuse
250mA
part # 26926
Neut
Hot
Gnd
110 Vac
Alarm 1
Alarm 2
Autodialer
Alarm
Page 7
FT522
Page 8
LT-65200029-A
9/1/10
Se a m e t r ics I n c o rpo r a t e d • 1 9 0 2 6 7 2 n d A ve n u e S out h • K ent , W a s hi n g t o n 98 0 3 2 • U S A
(P ) 2 5 3 .87 2 . 0 2 8 4 • ( F ) 25 3 . 8 7 2 .02 8 5 • 1. 8 0 0 . 9 75. 8 1 5 3 • w w w . s e am e t r i c s.c o m
TROUBLESHOOTING
Problem
Probable Cause Try...
Display blank No power to the unit Check for minimum 12 Vdc at power
terminals
Short in sensor circuit Disconnect sensor, see if display returns
(zero flow rate)
Display missing segments Damaged display module Contact distributor for return/replacement
Display reading meaningless Unit’s microcontroller crashed Disconnect and reconnect power, if problem
characters repeats, contact distributor for
return/replacement
Display reads normally, Wrong k-factor entered Check k-factor, enter proper one if in error
flow rate incorrect
Display reads normally, Wrong pulse output setting Check “SetP” to see if it is set correctly no
(wrong) pulse output
Polarity reversed on pulse output terminals Reverse leads and see if problem corrects
Display reads normally, Wrong 20 mA setting Check “Set 20” to see if it matches target top
no (wrong) 4-20 mA output flow rate
(FT420 only)
Inadequate loop power supply voltage Check voltage. For 4-20 mA applications,
24 Vdc recommended
Polarity incorrect in 4-20 mA loop circuit Compare to Connections diagram
Display reads zero when Flow sensor failed Consult flow sensor manual for how to test
there is flow
Break in flow sensor circuit Check for continuity with multimeter
Display reads flow rate when Long flow sensor wire, running parallel to Reroute wire or switch to shielded wire
there is none power wires
Flow sensor malfunction See flow sensor manual to check
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