Seametrics FT500-Series - Manual (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 Con-
nections diagram).
- Clear Total
This function resets the acccumulated total back to zero.
NOTE: 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.
Flow Monitoring. The flow rate and accumulated displays be-
gin 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% be-
low the high alarm set point. Similarly, alarm Relay 1 acti-
vates 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
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