
K-35
NON-INVASIVE LEVEL SWITCH
LVUN-600 Series
Starts at
$
1150
 Non-Invasive Design 
Will Not Cause Fluid 
Contamination
 Sensor Not Affected 
by Tubing and 
Fluid/Opaqueness
 High-Noise Immunity 
to EMI/RFI
 Clamp-On Sensor Works
on Pipes Up to 12.7 mm 
(0.5") Thick, 30 cm (12") 
Diameter
 Immune to Coatings and
Sticky of Corrosive 
Liquids
 1 or 2 Sensors 
With Alarm Relay 
Per Sensor
The non-invasive LVUN-600 Series 
monitors liquid levels at 1 or more 
points through pipes or tubing of 
various sizes, from 6.3 mm (0.25") 
diameter tubing to 305 mm (12") 
diameter pipe, with a wall thickness
of up to 0.5". The sensor simply 
clamps on the thick-wall pipe or tube; 
no alignment is necessary. The 
sensor is small, allowing mounting 
at almost any location, without 
interrupting the process or requiring 
the modification of the pipe or 
vessel. It is ideal for high-pressure, 
thick-wall tubing pipes or sight 
glasses.
The LVUN-600 Series can handle a 
variety of liquid types–from heavy to 
light. It uses ultrasonic sound wave 
propagation to generate electrical 
signals that are converted to bursts 
of ultrasonic energy. The ultrasonic 
bursts are transmitted across the 
liquid sensing gap of the sensor. 
Upon receipt of a valid signal at the 
receiver, the solid state electronics 
generate a “data enable” condition 
indicating that liquid is present. This 
signal energizes a relay, triggering 
an output condition.
SPECIFICATIONS
Repeatability: ±2 mm typical 
Delay: 0.5 seconds  
Input Power: 115 or 230 Vac, 50/60 Hz;
12 or 24 Vdc
Sensor Material: Epoxy 
Temperature Range:
Sensor: -40 to 82°C (-40 to 180°F),  
Electronics: -29 to 77°C 
(-20 to 170°F) (consult factory for  
higher temperature)
Housing: NEMA 7 standard 
Cable: 3 m (10') coaxial cable standard
LVUN-601-1-1-3-10-0.25-1-3, $1150, shown smaller than actual size. 
Product appearance may vary. Consult Flow Engineering. 
Specify: 
Pipe Material: ______________________ 
Pipe Thickness: ____________________ 
Pipe Outside Dia. ___________________ 
Length of Cable: ___________________
Clamp-on (non-invasive) sensor 
Dimensions: mm (in) 
ø = diameter

K-36
K
To Order 
(Specify Model Number)
Sensors/
Model No. Price Relays Description
LVUN-601-(A)-1-3-(D)-(E)-(F)-(G) Starts at 1
Select power (A), cable length (D), pipe thickness (E), pipe OD (F), 
$1150
pipe material (G) and NEMA 7 enclosure
LVUN-602-(A)-2-3-(D)-(E)-(F)-(G) Starts at 2
Select power (A), cable length (D), pipe thickness (E), pipe OD (F), 
1900
pipe material (G), and NEMA 7 enclosure
LVUN-601-1-1-3-10-SCH40-1"-3 1400 1
1" sensor, 115 Vac power, 3 m (10') cable for 1" OD plastic 
schedule 40 pipe
Model No. Price Description
70A-1 $20 Continuous tone alarm 
PSR-24L 60 24 Vdc regulated power supply 
ES-2253 159 Reference Book: Wastewater Treatment
Comes complete with operator’s manual. 
Ordering Examples: LVUN-601-3-1-3-10-SCH40-1"-2, 24 Vdc, 1" SCH40 carbon steel sensor with 3 m (10') cable and NEMA 7 enclosure, 
$1150 + 250 = $1400.
LVUN-601-1-1-3-10-SCH40-1"-1, 1" SCH40 stainless steel pipe sensor, NEMA 7 explosion-proof enclosure, 3 m (10') cable, $1150 + 250 = $1400.
Accessories
Model No. Number of Sensors/Relays Relay Types
LVUN-601 1 5 A SPDT 
LVUN-602 2 2 x 5 A SPDT
Ordering Options
AVAILABLE FOR FAST DELIVERY!
Ordering Suffix Additional Cost  Description
A-Power
1N/C 115 Vac 
2 $50 230 Vac 
3N/C 24 Vdc 
4N/C 12 Vdc
D-Cable Length
10' Standard 3 m (10') 
XX $5/ft Specify length in feet (100' max)
E-Pipe Thickness
0.25 N/C
1
⁄
4
"
0.XX or SCHY N/C Specify pipe OD (from 
1
⁄
4
to 
1
⁄
2
") or pipe schedule
F-Pipe OD [mm (in)]
Specify Standard 6.4 to 19 mm (
1
⁄
4
to 
3
⁄
4
") OD
Specify $250 For LVUN601 25.4 to 152.4 mm (1 to 6") OD 
Specify 600 For LVUN602 25.4 to 152.4 mm (1 to 6") OD
G-Pipe Material mm (in)
1N/C Stainless steel 
2N/C Carbon steel 
3N/C CPVC, PVDF or plastic 
4N/C Glass
CONTROL
UNIT
Glassround Tube 
Or Jogler Type
Refractive 
Type 
Sight Glass
Liquid Level
LVUN-600

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