SIStec SL3 / ABB LM80 Laser Level Transmitter (Laser Level Sensor)

I. Model Interpretation
ABB LM80: Original factory standard model, a pulse laser non-contact medium-long range level transmitter for solid particles / opaque liquids measurement, used for distance measurement and level monitoring of materials
SIStec SL3: Industry standard complete model naming, representing the LM80 body + standard P801 stainless steel dust-proof and cleaning sleeve as a complete set unit, mostly used in dusty silos and bins in SIS safety monitoring scenarios
Standard configuration: LM80 main unit + P801 dust-proof protection tube (Dust Tube) + flange installation base

Core Measurement Principle
Pulse laser time-of-flight (ToF) measurement, extremely narrow laser beam (divergence angle < 0.3°), no false echoes, not affected by dielectric constant of the medium, dust, or slope angle of the material surface; comes with a visible alignment laser indicator, quick installation and commissioning, factory-free calibration by ABB Group.

Key Technical Parameters
1. Range Specifications (SL3 Complete Set 30m Standard Version)
Standard set: 0 – 30m (SIStec SL3 standard configuration)
Factory maximum: Level measurement 0 – 100m; Positioning measurement 0 – 150m
Measurement accuracy: ±25mm; Resolution 10mm; Refresh rate 3 times/second
2. Electrical and Output
Power supply: 24VDC (18 – 30VDC)
Analog output: 4–20mA (support HART)
Switch output: Dual-channel relay high-low level alarm
Communication optional: Modbus RTU
3. Environment and Protection
Operating temperature: -40℃ ～ +60℃
Protection level: IP67 / NEMA 4X
Explosion-proof certification: ATEX, IECEx, CSA (Zone2/Class1 Div2, dust explosion-proof)
Cleaning interface: Built-in 1/8″ NPT cleaning port in the body, combined with P801 dust-proof tube to continuously provide air curtain protection for the lens, suitable for high-dust conditions such as cement, coal, and grain
4. Laser Safety Classification
Measurement laser: Class 1M (normal operation safety)
Alignment red light indicator laser: Class 3R (only short-time illumination during debugging)

P801 Dust Sleeve (Core Component of SL3 Set)
The core difference of SL3 compared to ordinary LM80: equipped with P801 stainless steel cleaning and dust-proof tube
Form a continuous clean air barrier to prevent falling materials and dust from adhering to the lens
Long tube structure to avoid direct impact of material splashing on the optical window
Integrated flange installation, compatible with 4-inch ANSI/DN100 standard bin top flange

Typical Application Scenarios (Common in SIS Safety System)
High-level and low-level safety interlock for cement, coal, power plant raw coal bins, fly ash silos (SIS/SIL loop)
Continuous level monitoring for grain, feed, plastic particle bins + full bin / empty bin safety cut-off alarm
Long-distance level measurement for ore, metallurgical bins, crushing bins
Liquid level monitoring for opaque liquids such as heavy oil, asphalt in storage tanks