EchoSwitch®
Ultrasonic Liquid Switch and Transmitter
LU77 Series Quick Start
©2019 Flowline, Inc.
All Rights Reserved
Made in USA
Flowline, Inc. | 10500 Humbolt Street, Los Alamitos, CA 90720 p 562.598.3015 f 562.431.8507 w flowline.com QS300284 Rev B
WELCOME TO THE ECHOSWITCH® QUICK START
The EchoSwitch® Quick Start provides basic mounting, setup and use instructions for getting the
EchoSwitch
not addressed here, please refer to the EchoSwitch
®
up and running quickly. If you have a non-standard installation or setup requirement that is
®
Manual or other support documentation located at
flowline.com.
WE DO YOUR LEVEL BEST
Thank you for purchasing EchoSwitch®. The sensor provides integrated LCD and three push-button
configuration. This quick start includes everything you’ll need to get the sensor up and running.
COMPONENTS
Depending on how the sensor part number that was shipped, EchoSwitch® comes with a Viton® gasket for
installation and the Quick Start.
®
ENCLOSURE
ECHOSWITCH
LU77-5004 & LU77-5064
Viton® gasket (1”)
P/N: 200128
While the switch housing is liquid-resistant the EchoSwitch® is not designed to be operational when immersed.
It should be mounted in such a way that the enclosure and transducer do not come into contact with the
application media under normal operational conditions. The enclosure has a flip cover with dual 1/2” NPT
female conduit ports and an internal terminal strip for wiring. Before closing the enclosure, make sure that the
enclosure gasket is properly seated, and that any conduit fittings, cable connectors or plugs are installed
correctly and sealed. Note: If using the Flowline LM90-1001 (liquid tight fitting) on the ½” conduit, the cable
minimum is 0.170” (4.3mm) and the maximum is 0.450” (11.4mm).
| 2 QS300284 Rev B
MOUNTING THE ECHOSWITCH®
The sensor should always be mounted perpendicular to the liquid surface using the provided Viton® mounting
gasket. Insure that there are no restrictions or obstacles in the path of the acoustic signal. For further
®
mounting information, please refer to the EchoSwitch
®
EchoSwitch
has 1” NPT or G threads and requires care in fitting selection and mounting to reduce any coupling
manual at www.flowline.com.
of the ultrasonic signal to the mounting structure. The below fittings are recommended.
Installation in existing 2” fittings:
1) Use a LM52-1800 2” thread x 1” thread adapter. Adapters with an air gap
around the 1 inch threads are recommended.
Installation in plastic tanks (use one of the following):
1) Use a 1” bulkhead fitting, such as the LM52-1890 bulkhead fitting.
2) Use a larger bulkhead fitting, such as the LM52-2890 with a reducer
bushing such as the LM52-1800.
3) Weld a plastic 1” half coupling to the tank top.
Installation in metal tanks (use one of the following):
1) Use the LM52-1890 bulkhead fittings or similar plastic fitting.
2) Use a flange with a 1” riser, such as the LM52-1850 (where the thread is
above the plane of the flange). Do not use a blind flange with a tapped
1” thread.
3) Use a larger flange or bulkhead fitting with a 2” thread and add a reducer
bushing such as the LM52-1800.
Note: While installations directly into a 1”metal fitting are not recommended,
acceptable results may be obtained if the 1” fitting is a half coupling in form
and the outer diameter of the coupler is tightly wrapped with vinyl tape.
LM52-1400
LM52-2890
LM52-1850
Installation in open tanks and sumps:
1) Use Flowline's LM50-1001-1 Side Mount Bracket.
Note: The Side Mount Bracket (LM50 series) is not designed for use with
LM50-1001-1
stand pipes or as a method to secure stand pipes. There are too few threads
to properly hold the sensor and the stand pipe.
Mounting in Riser:
As installations with tall, narrow risers can impede the acoustic signal. 2"
diameter risers should be no taller than 4". Larger diameter risers should be
no taller than 12". For best results, follow a 2:1 Height to Inner Diameter ratio
(example: 8” High to 4” Inner Diameter).
QS300284 Rev B 3 |
IMPORTANT MOUNTING GUIDELINES
®
1) Never mount the sensor at an angle.
2) Liquid should never enter the dead band.
3) Mount at least 2” from the side wall.
4) Never mount the sensor in a vacuum.
5) Do not obstruct the sensor’s beam width.
6) Do not install in the center of a dome top tank.
Mounting with a Stand-Pipe:
A stand-pipe may be used to dampen turbulence, separate surface foam from the point of measurement or
increase performance in heavy vapor. When mounting the sensor in a stand-pipe, the minimum diameter of the
pipe is 2”. Larger diameter pipes can be used. The pipe should be attached with a coupling or tank adapter and
reducer bushing. Avoid the use of multiple pipe fittings when possible. An ideal mount would be to select a 2”
tank adapter (S x T or S x S) and connect the pipe to the inside slip and use a reducer bushing to attach the
sensor (see example below).
The pipe length should run the measurement span and the bottom of the pipe should remain submerged at all
times to prevent foam from entering the pipe. Cut the bottom end of the pipe at 45° and drill a 1/4” pressure
equalization hole within the sensor’s dead band. Locate the stand-pipe away from pump outlets and/or other
sources of substantial turbulence which might cause the liquid in the pipe to oscillate.
EchoSwitch
LU77
2” x 1” (T x T)
Reducer Bushing
2” Coupling
(S x T)
Vent Hole (1/4”)
2” PVC Pipe
Stand-Pipe Example
LU77 attached to a LM521400 (2”x1” reducer bushing)
Stand-Pipe Mounting
to a SxT 2” Coupling.
| 4 QS300284 Rev B
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