Step Two
Step Three
SAFETY PRECAUTIONS
INTRODUCTION
About This Manual:
PLEASE READ THE ENTIRE MAN-
UAL PRIOR TO INSTALLING OR USING THIS PRODUCT.
This manual includes information on two different models of
Compact Relay Flow Controllers from Flowline: LC30-10_1 and
LC30-10_2. The LC30-10_1 is a single-input flow controller and
the LC30-10_2 is a single input flow controller with a Strobe
Alert™. Many aspects of installation and use are similar between
the three models.
User’s Responsibility for Safety:
FLOWLINE manufac-
tures several models of controller, with different mounting and
switching configurations. It is the user’s responsibility to select a
controller model that is appropriate for the application, install it
properly, perform tests of the installed system, and maintain all
components.
Electrical Shock Hazard:
It is possible to contact compo-
nents on the controller that carry high voltage, causing serious
injury or death. All power to the controller and the relay circuit(s)
it controls should be turned OFF prior to working on the controller.
If it is necessary to make adjustments during powered operation,
use extreme caution and use only insulated tools. Making adjust-
ments to powered controllers is not recommended. Wiring should
be preformed by qualified personnel in accordance with all applic-
able national, state and local electrical codes.
Flammable or Explosive Applications:
Sensor mount
controllers should not be used with explosive or flammable liq-
uids, which require an intrinsically safe or classified area rating.
If you are unsure of the suitability of a controller for your installa-
tion, consult your Flowline representative for further information.
Install In a Dry Location:
The LC30 series controller hous-
ing is liquid-resistant and made of Polypropylene (PP). When
installed properly, the controller is not designed to be immersed. It
should be mounted in such a way that it does not normally come
into contact with fluid. Refer to an industry reference to ensure that
compounds that may splash onto the controller housing will not
damage it. Such damage is not covered by the warranty.
Relay Contact Rating:
The relay is rated for a 10 amp resis-
tive load. Many loads (such as a motor during start-up or incan-
descent lights) are reactive and may have an inrush current charac-
teristic that may be 10 to 20 times their steady-state load rating. The
use of a contact protection circuit may be necessary for your instal-
lation if the 10 amp rating does not provide an ample margin for
such inrush currents.
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 fail-
ure is possible in two modes: under a heavy load the contacts may be
“welded” or stuck into the energized position, or corrosion may build
up 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 is a cost-effective,
modular liquid level controller whose body incorporates a female 3/4"
NPT (3/4" R) fitting, allowing it to be mounted directly onto any
Flowline sensor or Switch Pak™ or any 3/4" connection. Simply pro-
vide 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 flow or level switch. The relay is a
single pole, double throw type; the controlled device can be connect-
ed 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).
