Seametrics FT520-86 Instructions Manual

FT520-86 Flow Rate Alarm
Instructions rev b

General Information

The FT520 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 primary output of this unit is is a set of user­configurable alarm relays which can signal when a
maximum or minimum flow is reached. Applica­tions tyically include detection of a pipeline failure
or of a pump that has run dry. The dual relays can
be connected to an alarm, auto dialer, or any other
switch-controllable device.

In addition to the flow rate alarm, the FT520 has
analog output (4-20 mA, 0-5 VDC or 0-10 VDC)
and programmable pulse output. These can be
used for data logging or to provide proportional
chemical feed, using an externally-controlled
metering pump.

Specifications

Power 115 VAC (220 VAC optional),

50/60 Hz; 12 VDC

Temperature 32° -130° F (0° - 55° C)
Enclosure Precision cast aluminum,

NEMA 4X

Alarm Outputs Two Form C SPDT relay,

115 VAC 5A max

Max Pulse Output 100 mA at 60 VDC
Memory Type Non-volatile EEPROM

auto-backup

Sensor Power 12 VDC, 10 mA
Totalizer 8 digit
Rate Display 5 digit
Volume Units Gallons, cubic feet, cubic

meters, liters, million gallons

Time Units Minutes, hours
Analog Output 4-20 mA, 0-5 VDC, 0-10 VDC,

opto-isolated

Sensor Input Open collector current sink,

ESD protected

Max Input Frequency 1,000 Hz
Shipping Weight 7 lbs

Features

Easy-read

backlit display

Remote control terminals

(inside housing)

Rugged cast aluminum

housing

(wall or panel mount)

Start
Stop

0.00 GPM

0.00 GAL

Set

Resume

Relay 1
Relay 2

Pulse

Output

Choice of

rate/volume units

Alarm output

indicator LED

Accessible

control

buttons

LT-11298-A
Page 1 of 4

Installation

Displays

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” (see page 4). 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 T erminals. Remove the four screws which hold
the front plate to its flange. Remove the front plate. The
display board is attached to this front plate. It is also
connected to the power board by a ribbon cable. For
convenience, this cable can be disconnected while
making connections. Connections can be made inside
the enclosure, or the terminals can be unplugged for
easier access, by gently tugging on them.

Caution: When the control is
powered up, relay or analog
outputs may be active. If this
could be a hazard, wait to
make external connections

!

until programming is com­plete.

Sensor Connection. Follow the “Connections” diagram

to connect either two or three wires from the flow meter
or flow sensor.

Flow Alarm Connection. 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. This output can be configured 4­20 mA, 0-10 V or 0-5 V by placing a jumper in the cor­rect position on the analog header. The swith next to
the header selects active (powered) or passive
(unpowered) output. 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 DC power, be

SETTINGSOPERATION MODE

0 GPM
0 GAL

Flow

SET

Rate

SET

SET

SET

SET 20 mA RATE

SET

SET

Low Flow Alarm:

SET

0.0 GPM

High Flow Alarm:

SET

SET

SET

0.0 GPM

TO CLEAR TOTAL

SET

PRESS UP & LEFT

return to

SET

operation mode

Set Decimal

0.00

Set K-factor

Set Pulse Out

1.00 Gal

123456 GPM

60.00

GAL

MINUTE

sure to use a Seametrics PC1 (part number 05040) or
comparable 12 V 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.

Settings

Set Units. Press . Use to select volume

units. Use to select the particular unit desired
(gallons, liters, etc.). Then use to switch to time
units. Again, select the unit desired. Press for

next menu item.
Set K-Factor. The unit will not function properly

until this number is entered. It 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 flow sensors, the K­factor must be taken from the chart in the flow

sensor instructions, based on pipe size. Press
for next menu item.

Set Pulse Out. An output pulse is activated at the
selected volume intervals if this feature is in use.

Otherwise, it does not need to be set. Press for
next menu item.

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Set 20 mA Out. The “SET 20mA RATE” programs
the flow rate at which the output is 20 mA, 5 V or 10

V. Use and to set the maximum flow rate for
full scale output. Press

for next menu item.

Set Low Alarm. Use and to set the desired
minimum flow rate. Low alarm corresponds to alarm
relay one (see Connections diagram). Press for
next menu item.

Set High Alarm. Use and to set the desired
maximum flow rate. High alarm corresponds to

alarm relay two (see Connections diagram). Press

for next menu item.

Clear Total. This function resets the running total
back to zero. To reset to zero, press and

simultaneously, or press and the total will remain
the same. The “Start/Stop” and “Resume” keys are
not used in flow alarm mode.

Operation

The last press of the key returns the unit to
operation mode (see “Displays” diagram).

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 (see
procedure under “Settings”).

Alarms. Alarm relay two 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 one activates when
flow reaches the low alarm set point, and does not
deactivate until flow returns to 10% above the low
alarm set point.

Connections

Pulse Outputs

(for metering pumps)

-Autodialer

-Pump

-Alarm

-Valve Shutoff

Hot

Neut

110 VAC

Gnd

Alternate

12 VDC power

PC1 power supply

P/N 05040

Pulse 1

Pulse 2

Alarm 1

Alarm 2

Main

power fuse

250mA

part # 26926

Customer Supplies
1A Fuse

NO
COM

NC

NO

COM

NC

Ribbon connector

from display board

RESUME

COM

BATCH

+

s1

–

+

–

5V

10V

4-20mA

Jumpers

s2

Active

+

A

–

P

Passive

Analog Switch

Analog Jumper

A

utput

B

An O

RED

WHITE

BLACK

Resume
Start/Stop

Power signal
Sensor Input

Ground

0-5 V or
0-10 V or
4-20 mA

Remote
Controls

Dry contact

Meter

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Repair

The only field-repairable component on the FT522 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.

Panel Cut-out Dimensions

!

Caution: Always disconnect
power to the unit before
opening the terminal cover.
Do not reconnect power until
all connections have been
made and the terminal cover
has been replaced.

1/4" holes (4 required)

gasket

5.50"

6.03"

5.50"

PANEL
CUTOUT

6.03"

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20419 80th Ave. So., Kent WA. 98032 USA

Phone: [phone] Fax: [phone]

www.seametrics.com 1-800-975-8153