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White cylindrical ultrasonic level sensor with flat face 5.2 in long

Flowline

Flowline LU74-5004 ultrasonic level sensor 18.0 ft measurement tool

SKU CH-5J94-3YBQG

Measures liquid level up to 18.0 ft non-contact with 3 in. beam width and SPDT relays

  • Product typeAssortments & Kits
  • Non-contact measurement avoids fluid contamination
  • 0 ft range covers deep tanks and vessels
  • 2 in length fits small tank installations
  • 3 in beam width gives precise level readings
  • Push-button setup simplifies sensor configuration

Ultrasonic Level Sensor 18.0 Ft

The Flowline LU74-5004 is a noncontact ultrasonic level sensor designed for measuring fluid levels in small tanks and vessels. It provides accurate readings up to 18.0 ft for water, wastewater treatment and chemical processing applications. The sensor features an overall length of 5.2 in. and a beam width of 3 in. for precise measurement within confined spaces.

Replaces Manual Dipsticks and Float Switches

This sensor upgrades from contact-based methods like dipsticks or float switches that can foul, corrode or jam in process media. The jump is worth it when you need continuous, noncontact level data without inserting hardware into the fluid. PVDF construction resists many chemicals found in treatment plants, while SPDT relays configurable as normally open or closed simplify alarm and pump control logic.

Fits Small Vessels with Push-Button Setup

The 5.2 in. overall length allows installation in tight tank openings where longer probes cannot fit. A 3 in. beam width keeps the ultrasonic signal clear of nearby walls or obstructions for reliable echoes. Push-button configuration lets technicians set span, relays and damping on site without a laptop or handheld programmer. SPDT relay outputs connect directly to PLCs, SCADA inputs or local control panels.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $813.99
Pricier than about 91% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameFLOWLINE
Product typeAssortments & Kits

Questions about this item

What clearance does the 5.2 in. overall length need to fit in a small tank?

The sensor body is 5.2 in. long, so allow at least that depth plus space for cable routing and the 3 in. beam spread inside the vessel.

How are the SPDT relays wired during installation and what step is often missed?

Connect the relay commons, normally open and normally closed terminals to your controller, then use the push buttons to set the trip points — skipping the calibration step leaves the relays inactive.

When should the PVDF transducer face be cleaned or the sensor replaced?

Inspect the PVDF face whenever readings drift; clean with a soft cloth and mild detergent, and replace the unit if the ultrasonic signal degrades or the housing shows chemical attack.

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