LT-65200312-041415
4/14/2015
Seametrics Incorporated • 19026 72nd Avenue South • Kent, Washington 98032 • USA
(P) 253.872.0284 • (F) 253.872.0285 • 1.800.975.8153 • www.Seametrics.com
Problem
Probable Cause
Try...
Laptop screen reads
”No connection” and “Ac
-
tive” light is NOT blinking
Laptop screen reads
”No connection,” but “Ac
-
tive” light IS blinking
Flow rate incorrect
No flow rate
Wait for “Active” light to blink
Replace battery
Tighten cable
Test cable (tech bulletin “DL75/76: Testing the
DC3 Serial Cable” on Downloads page at
www.Seametrics.com)
Make sure K-factor in DL76 matches flow sen
-
sor
Mechanical: See if rotor spins freely
EX Magmeter: See if “Status LED” indicator is
blinking
Check for flow rate
DL76 is transmitting data.
Wait two minutes before taking action.
Dead battery in DL76
Loose cable
Bad cable
K-factor setting is incorrect
Damaged flow sensor
Broken wire
TROUBLESHOOTING
CONNECTIONS
Caution:
Do not apply external
power to the DL76
+
S
-
DL75
To Flow
Sensor
BA
TTER
Y
Sensor Input
Output
s
Sensor
Pulse
-
+-
+
To Pulse Responsive
Metering Pump
FT415
BA
TTER
Y
Pulse
Passthru
Pulse
Scaled
Sensor
Input
Power
4-20 mA
To Flow Sensor
S
12-32 Vdc
Loop Power Supply
4-20 mA Device
-
+
+
-
+
-
+
-
+
-
FT420
+
S
-
DL75
BA
TTER
Y
+
-
-
DL76 TO FT415
DL76 TO FT420
White
Green
White
Green
Red
Black
Black