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An S-beam load cell can measure axial tension and compression, but a reversing machine introduces more than two signs on the display. Fixture play, preload and cable movement can change the result around zero. Specify the complete push-pull cycle before selecting the sensor and instrument.
S-Beam Load Cell Selection for Reversing Force
The METRAVON MV-LC0099 is rated for axial tension and compression, with listed capacity options in the 500-2000 kg range. Use those ratings with the supplied force convention and calibration data; do not treat the lowest rating as a minimum detectable force.
| Cycle phase | Fixture check | Reading to retain |
|---|---|---|
| Preload | Assembly force before the useful test starts. | Gross load and the chosen tare convention. |
| Pull | Axial alignment and secure tension fittings. | Reference force and instrument output. |
| Push | Stable compression path without binding or buckling. | Compression response using the agreed sign. |
| Reversal | Backlash, contact changes and cable pull. | Zero return and behaviour while force changes direction. |
Check the Measuring Input Before Connecting the Bridge
MV-LC0099 has a nominal 2 mV/V sensitivity and a documented 10-12 V excitation range. Match both to the receiving bridge input. A transmitter with a different excitation specification must not be assumed compatible just because it accepts a similar millivolt signal.
For a test that captures peaks, request the complete measurement chain's usable response and recording rate. Static error figures do not define bandwidth. Test the chosen filtering with the required event duration rather than selecting the smoothest display.
Keep Installation Torque Out of the Sensor Body
Use the approved fitting and tightening procedure. Do not twist the sensing body between two fixed attachments to bring a thread into position. Check engagement, locking and alignment after assembly, and ensure the cable can follow the intended movement without becoming a restraint.
Where cycling is frequent, submit the force amplitude, reversal pattern and required life for assessment. Safe overload is not a fatigue rating and does not enlarge the calibrated working range.
Test-Fixture Questions
Q1. Can tension calibration be used for compression as well?
Only if supported by the applicable calibration and acceptance requirements. Verify each required direction in the assembled fixture; mechanical contact and alignment may change when the force reverses.
Q2. Why does the reading fail to return to the same zero?
Inspect fixture movement, binding and preload first, retaining the as-found reading. Then assess the electrical chain and sensor condition. Repeatedly applying tare hides the symptom and removes useful evidence.
Q3. What makes an existing S-beam a compatible replacement?
Matching capacity is insufficient. Compare connections, dimensions, force direction, excitation, sensitivity and the required measurement speed, then plan an installed calibration.
Summary
Specify reversal behaviour and attachments as carefully as peak force. Send the cycle and fixture drawing for an MV-LC0099 selection review, including the proposed bridge instrument.
