The intrinsically safe reflective ultrasonic level transmitter provides continuous level measurement up to 39.3’ (12m) with a 4-20 mA analog signal output, and is configured via its integral push button display module or WebCal software. The non-contact liquid level sensor features our proprietary Reflective Technology™ that delivers reliable level measurement in condensing environments. Select this sensor for bulk tanks with non-foaming and mildly vaporous media such as chemicals, water, wastewater and oil. Typical applications include bulk storage, neutralization tank, clarifier and waste sumps.


  • Offered in 6m (19.6’) and 12m (39.3’) measurement ranges
  • Reflective Technology™ measures reliably with condensation
  • Corrosion resistant PVDF transducer with aluminum enclosure
  • Narrow 3” (7.6cm) beam width for applications with limited space
  • LCD display indicates level in inches, meters or percent of span
  • Fail-safe diagnostics with selectable fail-safe signal outputs
  • Configuration via push button display or WebCal software
  • Automatic temperature compensation from -40º to 80º C.


Condensation is the most common variable in liquid level applications. Condensation attenuates the acoustic signal of ultrasonic sensors with horizontal transducers, weakening their signal strength and signal to noise ratio by up to 50%, and substantially reducing their measurement reliability. At the core of Reflective Technology™ is a simple fact. Unlike flat horizontal surfaces, significant water droplets cannot adhere to smooth vertical surfaces. By orienting the transducer vertically, condensation runs off the transducer and does not affect sensor performance. The unimpeded transmit and receive signals are redirected to and from the liquid off a 45º reflector, delivering reliable level measurement. Thanks gravity.

Reflective Transducer
Reliable Measurement
Horizontal Transducer
Signal Attenuation


P/N Description From
US06-0001-00 6m (19.6′) range, 2″ NPT, w/o Fob $1,000.00
US06-0001-01 6m (19.6′) range, 2″ NPT, w/Fob $1,065.00
US06-0011-00 6m (19.6′) range, 2″ G, w/o Fob $1,000.00
US06-0011-01 6m (19.6′) range, 2″ G, w/Fob $1,065.00
US12-0001-00 12m (39.3′) range, 3″ NPT, w/o Fob $1,350.00
US12-0001-01 12m (39.3′) range, 3″ NPT, w/Fob $1,415.00
US12-0011-00 12m (39.3′) range, 3″ G, w/o Fob $1,350.00
US12-0011-01 12m (39.3′) range, 3″ G, w/Fob $1,415.00
LB12-1001 Intrinsic safety barrier $1,200.00


WebCal software is a PC utility program that enables users to easily configure and test compatible Flowline level sensors to their measurement and control requirements. Download your free copy.


Range: US06: 8” to 19.6’ (20cm to 6m), US12: 18” to 39.3’ (45.7cm to 12m)

Accuracy: ± 0.2% of range

Resolution: US06: 0.079” (2mm), US12: 0.196” (5mm)

Dead band: US06: 8” (20.3cm), US12: 18” (45.7cm)

Beam width: US06: 3” (7.6cm), US12: 6” (15.2cm)

Configuration: Push button or WebCal® PC Windows® USB® 2.0

Memory: Non-volatile

Display type: LCD, 6-digit

Display units: Inch, cm or percent

Supply voltage: 14-28 VDC

Loop resistance: 500 ohms @ 24 VDC

Signal output: 4-20mA, two-wire

Signal invert: 4-20mA or 20-4mA

Signal fail-safe: 4mA, 20mA, 21mA, 22mA, hold last

Process temp.: F: -40º to 176º, C: -40º to 80º

Temp. comp.: Automatic

Ambient temp.: F: -40º to 176º, C: -40º to 80º

Pressure: 30 psi (2 bar)

Enclosure rating: Type 4X (IP66)

Encl. material: Aluminum

Enclosure vent: Water tight membrane

Conduit entrance: 1/2” NPT

Transducer type: Reflective

Transducer mat.: Polyvinylidene fluoride

Process mount: 06-0001: 2” NPT, 06-0011: 2” G, 12-0001: 3” NPT, 12-0011: 3” G

Mount gasket: -0001: N/a, -0011: Viton®

Classification: Intrinsically safe

Approvals: CSA for Canada: Class I, Division 1, Groups A, B, C and D T4; Class II, Division 1, Groups E, F and G T4; Class III, T135C; Ex ia IIC T4 Ga; Ex ia IIIC, T135C Da; CSA for U.S.: Class I, Division 1, Groups A, B, C and D T4; Class II, Division 1, Groups E, F and G T4; Class III, T135C; Class I, Zone 0, IIC AEx ia T4 Ga; Class II, Zone 20, IIC AEx ia, T135C Da

Entity parameters: Install per control drawing #600820

Compliance: CE, RoHS


If you want help in selecting a sensor for your application, please submit a Level Questionnaire. An engineer will review your requirements and suggest a product solution via email.



Processing Magazine selected Flowline to receive their Breakthrough Product of the Year Award for our EchoPod and EchoTouch reflective ultrasonic sensors that provide reliable level measurement in condensing environments. See how.