Xylem FT420 RATE/TOTAL INDICATOR - Manual (Page 3)

TABLES AND DIAGRAMS
Page 1
GENERAL INFORMATION
The FT400-Series flow computers are microcontroller-based
indicator/transmitters that display flow rate and total and
provide output signals. The FT415 is battery-powered and
provides a scalable pulse output. The FT420 is powered by
external DC voltage and has both pulse and 4-20 mA analog
outputs. When the FT420 is being used in the 4-20 mA mode,
it is a “two-wire” or “loop-powered” device, meaning that the
4-20 mA output signal doubles as its power supply.
The addition of a dual-relay output board (FT420 only) allows
for certain applications requiring contact output isolation (e.g.,
certain metering pumps and water treatment controls). Dual
solid state relays provide exactly the same pulse output as the
standard unit, and each can signal one external device. A non-
resettable total is also available. The FT420 can be ordered in
a plastic enclosure with a 115 Vac power supply for use with
mechanical meters, or with a built-in 115 Vac/12-24 Vdc dual
power supply for magmeters.
Both the FT415 and the FT420 can be factory-mounted on
the meter (-M) or remotely wall mounted with the brackets
provided (-W). The FT420 is also available as a panel mount
(-P) with an open back for easy installation in the user’s own
electrical enclosure. Most FT400’s can be converted from
wall-to-meter or meter-to-wall mount configurations after
installation if needed.
Housings for the -W and -M models are rugged cast aluminum,
potted and gasketed for maximum environmental protection.
A membrane keypad allows settings to be changed without
removing the cover. (Password protection, a standard feature,
can be used to prevent settings from being changed.)
**Includes password protection for tamper prevention
when needed
Lower Housing
Setup Keys**
Cover Screws
Electronics Module
Wall-Mount Brackets
Strain Relief
Display
FEATURES
**Includes password protection for
tamper prevention when needed
SPECIFICATIONS*
Lithium "C", 3.6 Vdc, replaceable, 3-5 year life
6-digit autorange, 1/2" character height
8-digit, 5/16" character height
Scaled Pulse output (0.1 sec duration 6.1 Hz max) (or High Alarm output or Low Alarm output)
Sensor pass-through Pulse output (unscaled)
None
0.1 - 9999999.9 units/pulse
Micropower GMR Sensor (square wave)
1.0 - 150 pulses/second
.001 - 99999.999
.01 - 999999.99
-30˚ to 65˚ C (-22˚ to 148˚ F)
NEMA 4X, IP66
Power
Display Rate
Total
Outputs Current Sinking Pulse
Analog
Pulse Output Range
Input
Input Range
K-Factor Range
Flow Alarm Output Range
Operating Temperature
Environmental
FT415 FT420
*Specifications subject to change • Please consult our website for current data (www.seametrics.com).
12-30 Vdc, 4mA (4-20 mA when loop-powered)
6-digit autorange, 1/2" character height
8-digit, 5/16" character height
4-20 mA loop; 24-30 Vdc
0.1 - 9999999.9 units/pulse
5V pulse or contact closure
1.0 - 1,500 pulses/second
.001 - 99999.999
.01 - 999999.99
-30˚ to 65˚ C (-22˚ to 148˚ F)
NEMA 4X, IP66