Flowline LC52 DataPoint - Manual (Page 7)

Step Ten Step Eleven
EXERCISE EXERCISE
The following exercise demonstrates inventory control with auto-
matic filling and a high level alarm. The usable range is 60 inches of
liquid. The pump starts filling at 10 inches of liquid and stops filling
at 50 inches of liquid. A high level alarm occurs at 55 inches of liq-
uid.
Enter all values into the LC52 in inches. The OFFSET is the corre-
sponding 4 mA setting in inches. The SPAN is the corresponding 20
mA setting in inches. RLY2A and RLY2B is dedicated to the filling
of the tank because RELAY2 is a latching relay. RLY1 is dedicated to
the high level alarm because it is a single set point relay. Use the fol-
lowing values for programming the LC52-1001.
The next exercise demonstrates the same inventory control with auto-
matic filling and a high level alarm. However, the units have been
changes from inches to gallons. Within the tank, 1” = 50 gallons of
liquid.The usable range is now 300 gallons of liquid. The pump starts
filling at 50 gallons of liquid and stops filling at 250 gallons of liquid. A
high level alarm occurs at 275 gallons of liquid.
OFFSET SPAN RLY1 RLY2A RLY2B
0.0 60.0 55.0 50.0 10.0
OFFSET SPAN RLY1 RLY2A RLY2B
0 300 275 250 50
Enter all values into the LC52 in gallons. The OFFSET is the corre-
sponding 4 mA setting in gallons. The SPAN is the corresponding 20
mA setting in gallons. RLY2A and RLY2B is dedicated to the filling
of the tank because RELAY2 is a latching relay. RLY1 is dedicated to
the high level alarm because it is a single set point relay. Use the fol-
lowing values for programming the LC52-1001.
The following exercise demonstrates inventory control with a high
and low level alarm. The usable range is between 16 and 56 inches of
liquid. The high level alarm occurs at 50 inches of liquid and the low
level alarm occurs at 20" of liquid.
Enter all values into the LC52 in inches. The OFFSET is the corre-
sponding 4 mA setting in inches. The SPAN is the corresponding 20
mA setting in inches. RLY1 is dedicated to the high level alarm
because it is a single set point relay. RLY2A is dedicated to the low
level alarm because the latch is turned off on Relay 2. Use the follow-
ing values for programming the LC52-1001.
The next exercise demonstrates the same inventory control with a
high and low level alarm. However, the units have been changes from
inches to gallons. Along the straight side of the tank, 1” = 50 gallons
of liquid. The usable range is now from 50 to 250 gallons of liquid.
The high level alarm occurs at 220 gallons of liquid. The low level
alarm occurs at 70 gallons of liquid.
Enter all values into the LC52 in gallons. The OFFSET is the corre-
sponding 4 mA setting in gallons. The SPAN is the corresponding 20
mA setting in gallons. RLY1 is dedicated to the high level alarm
because it is a single set point relay. RLY2A is dedicated to the low
level alarm because the latch is turned off on Relay 2. Use the follow-
ing values for programming the LC52-1001.
20 mA = 300 gallons
High Alarm = 275 gallons
Pump OFF = 250 gallons
Pump ON = 50 gallons
4mA = 0 gallons
20 mA = 250 gallons
High Alarm = 220 gallons
Low Alarm = 70 gallons
4mA = 50 gallons
20 mA = 60" of Liquid
High Alarm = 55" of liquid
Pump OFF = 50" of liquid
Pump ON = 10" of liquid
4mA = 0" of liquid
20 mA = 65" of Liquid
High Alarm = 50" of liquid
Low Alarm = 20" of liquid
4mA = 0" of liquid
OFFSET SPAN RLY1 RLY2A
16.0 56.0 50.0 20.0
OFFSET SPAN RLY1 RLY2A
50 250 220 70