MV-LC0028 Compression Column Load Cell with Central Base Thread

METRAVON MV-LC0028 is a compression column load cell with a curved upper contact and a central threaded base feature. Its rated outline changes substantially within the 20-60 t interval. A replacement should therefore be checked at the upper seat and lower base together: matching the external diameter or the base screw alone does not establish the same contact profile, installed height or support reaction.

Match the compression column load cell top profile to the retained seat

In the 20 t row, the upper contact G is 31.8 mm and the curved-profile entry D is 150 mm. At 30 t G changes to 38 mm while D remains 150 mm. The 40/50 t group has G = 54 mm and D = 200 mm; the 60 t row uses G = 79 mm and D = 309 mm. D belongs to the SRD callout at the curved contact. It is not the overall sensor height. Retain an old upper seat only after the full contact section and permitted movement have been checked.

Review base thread, supporting land and height in one section

The 20 and 30 t rows specify M12, whereas 40, 50 and 60 t use M20. Other features change at the same time. For example, the 20 t body A and overall B references are 70 and 62.8 mm; at 60 t they are 166 and 144 mm. The lower H reference is a supporting-land diameter, not another thread size. Ask for the complete base contact, thread pitch and engagement detail. A central screw must not bottom out or become an unintended force path through a locally made adaptor.

Check the physical support before replacing a drifting cell

With the structure safely supported, examine the contact surfaces, base condition, seat wear and clearance around the side enclosure. Do not try to correct a mechanical contact fault by changing the instrument span. Keep installation and removal access in the base design, particularly where a vessel leg prevents the sensor from being lifted straight out. Compression use is documented; a threaded recess is not evidence that this unit can be suspended from the base or used as an unrestricted tension link.

Recheck the weighing input after any mechanical change

The specified bridge has 2.0 +/-0.002 mV/V output, 400 +/-20 ohms input and 380 +/-5 ohms output resistance, with 10-12 V DC excitation. Use the terminal functions supplied with the actual sensor, not an assumed wire-colour polarity. If an existing indicator serves several supports, identify every connected bridge and any junction-box adjustment before accepting the replacement. Calibration then needs agreed force or weight references through the completed upper-seat and base arrangement, not only an empty zero adjustment.

Define the useful reading interval and exposure requirements

Precision is 0.05% FS and temperature effect is 0.02% FS per 10 deg C. State the tare, maximum local reaction and useful net increments so these full-scale entries can be assessed for the application. The operating temperature is -40 to +85 deg C. For IP68, specify the actual water conditions and termination location; confirm alloy steel or stainless steel separately. The sensor safe-load entry of 200% FS is not a rating for the retained seat, central fixing, vessel leg or a site proof-load procedure.

If the retained plate has paired base positions, compare the MV-LC0027 twin-fixing outline. The mounting decision needs its full height and upper contact, not only a comparison between M12, M16 and M20 thread labels.

Submit the old seat and base-adaptor sections, selected capacity, support reaction and existing indicator details for an MV-LC0028 replacement review.

Curvature labels, base-adaptor reuse and replacement tests