Brief Product Description

The ABB LM80 is a high-performance non-contact laser level transmitter based on pulsed time-of-flight laser technology. Designed for continuous level measurement of granular bulk solids and opaque liquids, it supports up to 100m measuring range for level applications and up to 150m for positioning tasks. Featuring an ultra-narrow laser beam with no beam divergence, it avoids false echo interference from vessel internal structures. It is equipped with a built-in aiming laser pointer for simple alignment, 4-20mA analog output and relay alarm contacts. With ATEX, IECEx and CSA explosion-proof certifications, rugged aluminum housing and optional heated anti-condensation lens, it adapts to dusty, harsh industrial environments. As a reliable industrial measurement spare instrument, it is available as fully-tested surplus and refurbished units for maintenance and retrofit of existing level monitoring systems.

Core Product Functions

• Non-contact continuous level and distance measurement for opaque liquids and granular bulk solid materials
• Pulsed laser time-of-flight calculation, providing high precision level detection with auto-ranging function
• Ultra-narrow laser beam eliminates false echoes caused by vessel internal obstructions and falling material
• Built-in visible aiming laser pointer for quick and accurate installation alignment in tall or narrow silos
• 4-20mA analog current output plus dual relay outputs for high/low level alarm interlock
• Light and moderate dust signal processing capability, suitable for dusty silo and crusher measurement scenarios
• Optional heated lens module prevents lens condensation in humid and temperature-changing environments
• No factory calibration required after installation, supports simple on-site configuration via LCD2 hand-held configurator

• Explosion-proof certified design for hazardous area process level monitoring in chemical and petrochemical plants

Application Scenarios

• Continuous level monitoring for grain, ore, cement and plastic pellet silos and bunkers
• Opaque liquid level measurement in chemical, petrochemical and mining process vessels
• Crusher, hopper and feeding system material level control in aggregate and mining industries
• Power plant ash silo, coal bunker inventory monitoring and bulk material stock measurement
• Long-range positioning and anti-collision measurement for large mobile industrial machinery
• Spare replacement laser level transmitter for maintenance and retrofit of existing ABB level measurement installations

FAQ (Frequently Asked Questions)

• Q: LM80 gives unstable or fluctuating level readings during measurement?
  A: Check lens contamination, heavy dust or steam on site, verify laser alignment angle, inspect 24VDC power stability and cable shielding grounding.
• Q: Can ABB LM80 measure transparent liquids such as clear water?
  A: No, it is designed for opaque liquids and solid materials; transparent media cannot reflect laser signals effectively for reliable measurement.
• Q: Does the LM80 support hot-swap replacement while the process vessel is running?
  A: Electrical hot swap is possible, but for hazardous area installation, follow site safety lockout/tagout procedures before removing the instrument.
• Q: What is the purpose of the purge port on the sensor housing?
  A: The 1/8” NPT purge port can connect compressed air to blow dust away from the optical lens and maintain clean laser window.
• Q: Is ABB LM80 available for brand-new industrial measurement projects?
  A: This legacy laser level transmitter has reached end-of-life. Only fully-tested surplus and refurbished units are offered for existing-site maintenance and retrofit tasks.