Intrinsically Safe Ultrasonic Level Sensor
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Intrinsically Safe Ultrasonic Level Sensor

LPU-2428

Hazardous Locations Meet High Programmability

The LPU-2428 Intrinsically Safe Ultrasonic Level Sensor is a highly configurable, intelligent transmitter designed for hazardous locations. It accurately measures distance, level, flow, and volume in linear and non-linear tanks and open channels. With a 32-point linearization table, this CSA Class 1, Div. 1-certified sensor ensures precise calculations even in complex applications.

Built for maintenance-free operation, the IP65-rated housing and non-contact measurement make it ideal for hazardous environments. The loop-powered 4-20mA output ensures reliable communication with control systems.

  • Explosion Proof Safety: Intrinsically Safe for Class 1, Div. 1 hazardous locations
  • Low-Maintenance Performance: Non-contact ultrasonic measurement for hassle-free operation
  • Built for Tough Conditions: IP65-rated, PVDF housing for harsh environments
  • Versatile Measurement: Operating range of 1 to 25 ft. for liquids, 1 to 10 ft. for solids
  • Seamless System Integration: 4-20 mA output for easy industrial compatibility

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LPU-2428
Datasheet

LPU-2428 User Manual (for use with RST-4001 only)

LPU-2428 & RST-4101
User Manual

LPU-2428 Install Guide (for use with RST-4001 only)

LPU-2428A & RST-4101
Setup Software
  • Operating Range:
    • 1 – 25 ft. (0.3 – 7.6 m) on liquids
    • 1 – 10 ft. (0.3 – 3 m) on solids
  • Beam Pattern: 9º off axis
  • Internal Temperature Compensation
  • Frequency: 69 kHz
  • Accuracy: ±0.25% of detected range
  • Resolution: 0.1 in. (2.5 mm)
  • Response Time: Dependent on output, ranges from 0.6 – 3 seconds
  • Ratings: IP65
  • Operating Temp: -40º – 140ºF (-40º – 60ºC)
  • Total Current Draw: 4-20mA
  • Supply Voltage: 12-28 VDC
  • Wiring Connection: 2-conductor shielded cab
  • Interface with RST-4101 USB Module (purchase separately)
    • The RST-4101 is powered by a USB port connecting the RST to a computer. A 2-conductor terminal strip allows the module to be connected in parallel with the 4-20 mA loop.
  • Volume Measurement Settings: Formulas for a wide variety of common tank types
  • Flow Measurement Settings: Formulas for a wide variety of weirs and flumes total flow counter
  • 32-point linearization table for unique tanks, weirs, and flumes
  • User selected units of measure
  • Output: 4-20 mA (loop powered)
  • Loop Resistance:
    • 600 ohms @ 24 VDC
    • 150 ohms @ 12 VDC
  • Network/Web with the RST-5000 series module or LOE
  • PVDF (Kynar®) transducer housing
  • PC/PBT upper housing
  • Transducer Type: Ceramic, PVDF faced
  • Class 1, Div. 1, Groups C & D
  • Class 1, Zone 0, AEx iA IIB, T3; IP65
What makes the LPU-2428 suitable for hazardous locations?

The LPU-2428 is CSA-certified for Class 1, Division 1 hazardous locations, meaning it meets strict safety standards for environments with flammable gases or vapors. Its intrinsically safe design ensures reliable operation without the risk of ignition.

This ultrasonic sensor uses sound waves to detect the distance to a liquid or solid surface. Its programmable 32-point linearization table allows it to calculate level, flow, and volume even in non-linear tanks or open channels.

Yes. The sensor’s non-contact ultrasonic measurement eliminates wear and tear, and its IP65-rated PVDF housing resists harsh environmental conditions, reducing maintenance requirements.

Absolutely. The sensor features a loop-powered 4-20mA output, allowing seamless integration with industrial control and monitoring systems.

The sensor is ideal for both linear and non-linear tanks, as well as open-channel flow applications. Its 32-point linearization feature ensures accurate readings even in complex geometries.

Industries that require accurate level, flow, and volume measurement in hazardous locations, including:

  • Oil & Gas (tank level monitoring, hazardous material storage)
  • Water & Wastewater (open-channel flow, dam tail-water monitoring)
  • Chemical Processing (safe storage tank measurement)
  • Agriculture & Irrigation (channel flow monitoring, reservoir levels)

The LPU-2428 is highly configurable, but it does not require proprietary software. It can be programmed using standard industrial tools compatible with 4-20mA loop-powered devices.

MOUNT

2"
RANGE

1' – 15', 1' – 25'
OUTPUT

4-20 mA
CERTIFICATION

CSA – General, Intrinsically Safe
INDUSTRY

Chemical, Food & Beverage, Industrial Automation, Marine, Oil & Gas, Water & Wastewater
ENCLOSURE PROTECTION

IP65

WARRANTY

APG warrants its products to be free from defects in material and workmanship under normal use and service of the product for 24 months from the date of shipment from APG, unless otherwise specified by APG in writing. Read our full warranty policy HERE.

RETURNS

Returns and allowances must be authorized by APG in advance, which authorization may be granted or withheld by APG in APG’s sole and absolute discretion. Read our full return policy HERE.

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