Seametrics FT420 Manual

The FT420 flow computer comes with factory-set parameters for K-factor, pulse output, 4-20 mA output, precision
(number of decimals) of display, and time units. These operational parameters can be changed by the operator
(except when Passcode Protection is invoked); the procedures for these main menu functions are described in
detail in the FT420 Instruction Manual and are not repeated here.
In addition to the customer-controlled operations described above, there are a series of administration menus that
can be accessed by the Seametrics dealer in order to change basic functionality of the FT420:
Operation Mode:
Set K
Set P
Set A
Set 20
Set D
Set Time
Procedures for Accessing Administration Menus and Adjusting Values
To move from one (main menu) operation mode to another, use the SET key.
NOTE: The internal processor scans the front panel every one second - this may cause a "lag" in
button response.
To access the administration menu behind each (main menu) operation mode, press and hold all three
buttons (SET, LEFT ARROW, UP ARROW in order) for approximately five seconds.
To select among alternative (either/or) selections for a particular function, use the UP ARROW key.
When changing a multi-digit numeric value, select the digit to be changed by using the LEFT ARROW key.
To adjust a numeric value up or down, use UP ARROW key (see each function for specific details about
that adjustment).
IMPORTANT: No settings changes will be retained until you have completed the entire sequence,
ending on the screen first displayed when powering up.
Main Menu Function
(Details in Instruction Manual):
Adjust K-Factor numeric value
Set scale of pulses in pulse
output
Set high or low flow rate
at which flow alarm triggers
Set flow range over which
4-20 mA output is desired
Choose number of decimals
for display
Choose time units over
which flow is measured
DISTRIBUTOR USE ONLY
FT420 Administration Menus
Administration Menu Functions
(Details described in this document):
Lock/unlock user access to changing the
K-Factor
Three choices: pulse output, high flow alarm,
or, low flow alarm
Three choices: pulse output, high flow alarm
or, low flow alarm
Refine accuracy of 4-20 mA output reading
using a current meter
Enable or disable the resettable total function
Change jitter time (period of time to ignore
random pulses in full, non-flowing pipe), filter
time (amount of display dampening or
"smoothing" of reading), and volumetric units
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