LDMTR-01 Load Measurement Transmitter for Strain-Gauge Sensors

The LDMTR-01 is a compact, DIN‑rail load measurement transmitter designed to convert strain‑gauge load cell signals into clean, industrial outputs. From my experience, it’s the kind of module you drop into a control cabinet when you need stable 4–20 mA or 0–10 V signals and straightforward RS‑485 integration without a lot of fuss. You might notice that it focuses on the essentials: reliable excitation for the load cell, easy zero/span calibration, and solid EMC performance for noisy plants.

Key Features

• Strain‑gauge compatibility (4/6‑wire)
  – Typically supports common load cells (350 Ω and similar) with stable excitation for accurate readings.
• Analog outputs you actually use
  – 4–20 mA and/or 0–10 V for PLC/SCADA inputs; scaling is straightforward to match engineering units.
• RS‑485 Modbus RTU
  – In many cases the easiest way to get diagnostics and values into an HMI or historian without extra cards.
• Zero and span calibration
  – Two‑point (tare/span) setup via simple front procedure or software makes commissioning quicker than expected.
• Noise‑resistant design
  – EMC‑minded input filtering helps when drives or contactors are nearby; readings stay steady.
• Slim DIN‑rail profile
  – Saves cabinet space; typically one 22.5 mm slice on EN 60715 rail.
• Relay/alarm options
  – Threshold outputs can trigger lights, buzzers, or interlocks for basic protection.

Technical Specifications

Application Fields

The LDMTR-01 slots neatly into factory automation and process environments where force, weight, or tension need to be measured and shared with a PLC or SCADA. Common uses include:

• Hopper/silo weighing and batching lines
• Conveyor check‑weighing and packaging verification
• Web tension monitoring in printing and film production
• Press force measurement and mechanical test rigs
• Tank level by load cell (where liquids or solids make direct level measurement tricky)

“We swapped to LDMTR-01 on a mixer line. The analog signal is steady now—even with three VFDs in the same cabinet,” is the kind of feedback we hear a lot. It seems to be happiest in real‑world, slightly noisy cabinets.

Advantages & Value

• Reliability
  – Stable excitation and filtering provide consistent readings; fewer callouts for drifting signals.
• Compatibility
  – Works with mainstream PLC analog inputs and Modbus HMIs; no exotic drivers required.
• Cost efficiency
  – Combines transmitter and comms; in many cases you can skip a separate gateway or external conditioner.
• Practical support
  – Clear wiring, simple calibration, and typical pinouts make commissioning faster and less error‑prone.

Installation & Maintenance

• Cabinet environment: Mount on EN 60715 35 mm DIN rail in a ventilated panel; avoid condensation and corrosive atmospheres.
• Wiring: Use shielded twisted pair for load cell leads; land the shield at one point only (typically the transmitter end).
• Grounding: Maintain a low‑impedance panel ground; separate high‑current VFD cabling from low‑level sensor wiring.
• Calibration: Perform zero/tare with the vessel empty and span with known weights; recheck after thermal stabilization.
• Routine care: Inspect terminals quarterly, retighten if needed; keep vents clear; update firmware when available.
• Safety: De‑energize 24 VDC before servicing; verify correct polarity; follow local electrical codes.

Quality & Certifications

• CE compliant for EMC and safety (typical for this category)
• RoHS compliant materials
• Manufacturer warranty is typically 12 months; our coverage: 365 days

Suggested Accessories (Optional)

• 24 VDC DIN‑rail power supply (redundant if uptime is critical)
• Load cell junction box with trim resistors for multi‑cell platforms
• RS‑485 to USB/ETH gateway for PC/HMI integration
• Panel indicator for local weight display (if operators need a readout at the machine)