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Reflective Ultrasonic Level Transmitter w/Alarm for Small Tanks

Reflective Ultrasonic Liquid Level Transmitter with Alarm Contacts (4) for Small Tanks


Item# LVU501-B

In stock

Lead Time (If not in stock): 8 weeks
Reflective Ultrasonic Liquid Level Transmitter with Alarm Contacts (4) for Small Tanks LVU501-B LVU501-B
  • Designed to handle condensing environments
  • Offered in 1.5 m (4.9’) and 3 m (9.8’) measurement ranges
  • Fail-safe diagnostics with 4 selectable relays and signal outputs
  • Narrow 2” (5 cm) beam width for applications with limited space

LVU501-B Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Max Measurement Range
Process Connection Type
Media Type
Tank/Vessel Type
Max Operating Pressure
Max Process Temperature
Wetted Materials
Output Signal
Process Connection Size
Supply Power

The LVU500 Series general purpose reflective ultrasonic multi-function level transmitter provides continuous level measurement up to 3 m (9.8’) with a 4-20 mA analog signal output and four relays and is configured via web calibration software. The non-contact liquid level sensor features our proprietary Reflective Technology™ that delivers reliable level measurement in condensing environments. Each relay can be configured for alarm, automatic fill or empty functions. Select this sensor for small tanks with chemicals, water, wastewater and oil (non-foaming and/or highly vaporous liquids). Typical applications include day tank, IBC or drum, cooling tower, skid or machine, process tank and waste sumps.

Reflective Technology ™

Condensation is the most common issue for ultrasonic level transmitters. 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.

Day tank, skid or machine, cooling tower, IBC or drum, process tank, small waste sump

The sensor is configured via our WebCal software and one Fob USB adapter. WebCal is a PC utility program that allows users to easily configure their sensors, update firmware, save configurations and print wiring schematics prior to installation. WebCal is a free download from our website.

Range: LVU501: 1.5” to 4.9’ (3.8 cm to 1.5 m), LVU503: 4” to 9.8’ (10.1 cm to 3 m)
Accuracy: LVU501: 0.125” (3 mm), LVU503: ± 0.2% of range
Resolution: LVU501: 0.019” (0.5 mm), LVU503: 0.039” (1 mm)
Deadband: LVU501: 1.5” (3.8 cm), LVU503: 4” (10.1 cm)
Beam width: 2” (5 cm)
Configuration: WebCal® PC Windows® USB® 2.0
Memory: Non-volatile
Supply voltage: 14-28 VDC
Max. consumption: 0.5W
Loop resistance: 500 ohms @ 24 VDC
Signal output: 4-20 mA, two-wire
Signal invert: 4-20 mA or 20-4 mA
Signal fail-safe: 4 mA, 20 mA, 21 mA, 22 mA, hold last
Contact type: (4) SPST relays
Contact rating: 60 VA, 1A maximum
Contact fail-safe: Open, closed, hold last
Contact hysteresis: Selectable
Process temp.: F: -40 to 176º, C: -40 to 80º
Temp. comp.: Automatic
Ambient temp.: F: -31 to 140º, C: -35 to 60º
Pressure: 30 psi (2 bar)
Enclosure rating: Type 6P (IP68)
Encl. material: Polypropylene
Transducer type: Reflective Ultrasonic
Transducer mat.: Polyvinylidene fluoride
Cable jacket mat.: Polyurethane
Cable type: 9-conductor, shielded
Cable length: 48” (1.2m)
Process mount: 2” NPT, or 2” G
Mount gasket: 2” G FKM®
Classification: General purpose
Approval: UL 61010-1
Compliance: CE, RoHS
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Rated 5 out of 5 by from A better alternative to floats Works as expected. Being used for heated water tank level control. No issues with condensing liquid.
Date published: 2020-06-01
  • y_2024, m_7, d_24, h_7
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.42
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_1
  • loc_en_US, sid_LVU501-B, prod, sort_[SortEntry(order=HELPFULNESS, direction=DESCENDING), SortEntry(order=POSITIVE_FEEDBACK, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 10ms
loading all QA

Hi, what recommended display could you propose me for used with this sensor , because this tank have 15' and I need read the level in the ground.

Asked by: Luis2alonso
Thank you for your inquiry! Our platinum series meters are universal input meters and will operate with the 4-20 mA output from the LVU500 series. These meters can be configured to have different sizes and outputs based on your specific needs.
Answered by: Application Engineer JM
Date published: 2021-05-28

Is the FOB used on the LVU501 the same FOB that is used on the LVCN318?

Asked by: Pilot Plant Tech
Thank you for your inquiry about the ultrasonic level sensor. Unfortunately, no.
Answered by: Applications Engineer JC
Date published: 2021-04-07

Is the IP rating sufficient for outside mounting on top of a silo exposed to rain/snow? Media level being measured is sawdust. Thank you.

Asked by: PTSchram
Thank you for your inquiring for this level sensor. It does have a IP6 rating that provides outdoor protection to a degree, yet, unfortunately, this sensor is meant to measure liquids, not solids. Please email and can provide other level sensors for solid measurement.
Answered by: JC ENGR
Date published: 2020-07-30

we want to purchase level transmitter for use on caustic closed tank and HNO3 Closed tanks. please suggest us the model which is compatible to these liquids. range of tanks are upto 5meters.

Asked by: abdul latid
send us all this information to We will review and get back to you via email. Thanks.
Answered by: ASE HPO
Date published: 2020-07-21
  • y_2024, m_7, d_24, h_7CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.42
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_4
  • loc_en_US, sid_LVU501-B, prod, sort_[SortEntry(order=NUM_ANSWERS, direction=DESCENDING)]
  • clientName_omega
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getContent, 36ms
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