Flowline LC30 Thermo-Flo User Manual
Page 5
Rev A
LC900008
5 of 14
SAFETY PRECAUTIONS (cont.)
Step Three
Make a Fail‐Safe System: Design a fail‐safe system that accommodates the possibility of relay or power
failure. If power is cut off to the controller, it will de‐energize the relay. Make sure that the de‐energized
state of the relay is the safe state in your process. For example, if controller power is lost, a pump filling a tank
will turn off if it is connected to the Normally Open side of the relay.
While the internal relay is reliable, over the course of time relay failure is possible in two modes: under a
heavy load the contacts may be “welded” or stuck into the energized position, or corrosion may buildup on a
contact so that it will not complete the circuit when it should. In critical applications, redundant backup
systems and alarms must be used in addition to the primary system. Such backup systems should use
different sensor technologies where possible.
While this manual offers some examples and suggestions to help explain the operation of FLOWLINE products,
such examples are for information only and are not intended as a complete guide to installing any specific
system.
Sensor‐mount controllers: The LC30 Series is a cost‐effective, modular flow controller, whose body
incorporates a female 3/4" NPT (3/4" R) fitting, allowing it to be mounted directly onto any Flowline sensor or
any 3/4" connection. Simply provide its required AC power and a controlled device such as a valve, pump, or
alarm that can be switched by the controller’s relay in response to the sensor input.
Features of the LC30 Single Input Controller: The LC30 Controller is designed to receive a signal from a single
flow switch. It turns its internal relay On or Off (as set by the invert switch) in response to the presence of flow
or no‐flow, and changes the relay status back again when the sensor reverses. The LC30 may be used with any
FLOWLINE N‐channel or relay flow switch. The relay is a single pole, double throw type; the controlled device
can be connected to either the normally open or normally closed side of the relay. A time delay from 0 to 60
seconds can be set before the relay responds to the sensor input.
Typical applications for the LC30 are flow or no‐flow switch/alarm operations (activating an alarm at no‐flow).
Components:
Part Number
Thread
Power
CE
CSA
Strobe
Alert™
LC30‐1001
¾” NPT
120
No
Yes
No
LC30‐1001‐CE
Yes
No
LC30‐1001‐E
240
No
Yes
LC30‐1001‐E‐CE
Yes
No
LC30‐1051
¾” Rc
120
No
Yes
LC30‐1051‐CE
Yes
No
LC30‐1051‐E
240
No
Yes
LC30‐1051‐E‐CE
Yes
No
LC30‐1002
¾” NPT
120
No
No
Yes
LC30‐1002‐E
240
LC30‐1052
¾” Rc
120
LC30‐1052‐E
240
Owner’s Manual