MV-LC0030 Compression Column Load Cell

The METRAVON MV-LC0030 is a compression column load cell for high-capacity weighing. Its published capacity range is 10-500 t, with a 2.0 +/- 0.002 mV/V analog output. Typical duties include truck scales, dynamic rail scales, large hopper scales and vessel weighing where the load can be introduced through a controlled compression path.

Capacity must be checked at each support

For a multi-cell scale, divide the maximum service load by the number of supports only as a starting point. The service load includes the empty structure, maximum product or vehicle load and any attached equipment. Unequal load sharing, braking forces, impact, thermal movement and installation tolerances can make one support carry more than the simple average.

Select capacity from the highest calculated support load. The 200% F.S. safe-load limit is an overload specification, not a measurement range or a structural safety factor. It does not specify an allowable duration, repeated impact duty or lateral loading capability. Keep normal operating loads within the rated capacity.

Published electrical and environmental data

Confirm the alloy-steel or stainless-steel construction, body dimensions and cable arrangement for the chosen capacity. Several dimensional groups cover the 10-500 t range. Equal outside diameter or equal rated load is insufficient to establish that an existing mounting cup and top bearing will fit.

Load introduction and alignment

A column load cell is intended to receive compression through its designed loading surfaces. A tilted bearing surface, lateral restraint or a structure that rocks can add bending and side force that are not part of the calibration. The supporting steelwork should be stiff, level and able to return the load through the same path after repeated loading.

For vehicle or rail scales, check end stops, approach alignment, deck freedom and braking forces. For hoppers and silos, check pipes, ladders, platforms and flexible connections for force paths that bypass or preload the cells. If the structure needs horizontal restraint, the restraint arrangement must control movement without carrying a changing share of the vertical weighing load.

The sensor does not send 4-20 mA by itself

The MV-LC0030 is a strain-gauge bridge sensor with a millivolt-per-volt output. A compatible weighing indicator, transmitter or data-acquisition module must provide excitation, measure the differential signal and perform calibration. Specify a separate transmitter when the PLC requires 4-20 mA, RS485 or Modbus RTU and the selected weighing instrument does not already provide that interface.

For several cells connected through a junction box, use compatible capacities and sensitivities, document the wiring colors and trim the corners or supports with known loading. Cable extensions and junction boxes should preserve shielding and insulation resistance. The calibration record should identify the indicator or transmitter used, not only the cell model.

At 10 V excitation, the nominal 2 mV/V sensitivity produces a 20 mV change from zero to rated load. This is a calculated signal value, not a factory calibration result. Four nominal 400-ohm input bridges connected in parallel present about 100 ohms and draw about 100 mA at 10 V. Check the actual resistance tolerance and the indicator's excitation rating before connecting several cells. A standard 4-20 mA PLC input cannot read this bridge signal directly; see the load-cell signal chain and PLC wiring guide.

Test the assembled scale

1. Check each cell model, capacity, serial number, mounting part and cable condition before loading.
2. Record individual cell signals where the system permits, then check the combined zero.
3. Apply known loads at defined positions and verify corner or support balance.
4. Complete increasing and decreasing load checks to identify binding or poor return to zero.
5. Confirm the final displayed weight and any PLC value use the same unit and calibration.
6. Keep the test-load traceability, wiring diagram and as-left parameters with the handover record.

Record the results before adjustment as well as after calibration. The load cell calibration guide covers reference loads, repeatability and eccentric loading; these checks distinguish a good centre-point reading from a scale that performs across its working surface.

Questions before approval

Q1. Can a 100 t cell be substituted for another 100 t column cell?

Only after checking body dimensions, loading radii, height, resistance, sensitivity, excitation, cable and calibration. Equal capacity does not establish mechanical or electrical interchangeability.

Q2. Is the stated accuracy the same as scale accuracy?

No. The complete scale also includes structure, load introduction, multiple-cell matching, junction-box adjustment, indicator resolution, calibration weights and operating conditions. Write the system acceptance requirement separately.

Q3. Does an IP68 cell make a flooded weighbridge reliable?

The rating applies to the specified cell enclosure under its test conditions. It does not establish immersion performance for a cable splice or junction box. Inspect drainage, cable entry and connectors, and obtain the applicable depth and duration conditions before approving submersion. Moisture in the junction box can destabilize an otherwise intact sensor.

Specify the capacity and mounting parts

For an MV-LC0030 quotation, send the empty and maximum scale loads, support layout, loading arrangement, cable length and indicator details. For replacement work, include the old cell drawing and photographs of the loading cups. State whether the application is stationary weighing or moving-load measurement and how the completed scale will be calibrated. This identifies the cell and associated hardware needed for the installation.