Seametrics FT520-86 - Manual (Page 3)

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.
Pulse 1
Alternate
12 VDC power
Pulse 2
NC
COM
NO
NC
NO
COM
Resume
0-5 V or
0-10 V or
4-20 mA
Sensor Input
Start/Stop
–
+
– +
s1
+
–
s2
RESUME
COM
BATCH
Remote
Controls
Pulse Outputs
(for metering pumps)
Main
power fuse
250mA
part # 26926
Ribbon connector
from display board
Meter
Power signal
RED
BLACK
Dry contact
Customer Supplies
1A Fuse
WHITE
Ground
A
B
An O
utput
A
P
Passive
Active
Jumpers
5V
10V
4-20mA
PC1 power supply
P/N 05040
Neut
Hot
Gnd
110 VAC
Alarm 1
Alarm 2
-Autodialer
-Pump
-Alarm
-Valve Shutoff
Analog Switch
Analog Jumper
Connections
3 of 4
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.