LM231EX is a flame‑proof weight indicator designed for hazardous explosive atmospheres (gas & dust hazardous zones). Die‑cast aluminium explosion‑proof enclosure meets Ex‑d isolation explosion‑proof standard, safe for chemical, pharmaceutical, paint, grain and petrochemical weighing sites.

Equipped with high‑precision 24‑bit Σ‑Δ AD conversion, 6‑digit high‑bright LED display. Supports multiple weighing modes: basic weighing, counting, check‑weighing, accumulation, animal weighing. Standard isolated RS232 / RS485 communication, Modbus‑RTU protocol supported for connecting PLC, printer and host system. Multiple optional modules: Ethernet, 4‑in‑4‑out digital I/O, Bluetooth, label print function. Rugged mechanical structure, wide operating temperature range, adapts to harsh on‑site industrial conditions.

Product Features

• Ex‑d flame‑proof isolation explosion‑proof housing for hazardous area installation
• 24‑bit high‑speed Σ‑Δ A/D conversion, max display resolution 200 000 divisions
• Drives up to 10 pcs of 350 Ω load cells
• 6‑digit bright LED numeric display, clear reading under strong light
• Built‑in isolated RS232 / RS485, Modbus‑RTU; optional Ethernet / Bluetooth / Digital I/O
• Multi‑function: zero, tare, check‑weigh, count, total accumulation, label printing
• Surge & lightning protection for communication ports
• Multiple mounting options: wall‑mount, pipe bracket, desktop installation
• Wide temperature working range for heavy‑duty industrial environment

Typical Applications

• Explosion‑proof platform scale, floor scale, hopper weighing
• Hazardous‑zone batching & dosing control
• Chemical, fine‑chemical, pharmaceutical, coatings, solvent processing plants
• Grain, oil & petrochemical raw‑material inventory weighing
• Explosion‑safe check‑weighing & sorting stations

Specifications