Load-cell mV/V sensitivity — what spec to ask for

A technical reference for buyers and integrators

If you have ever looked at a load-cell datasheet and seen "Rated Output: 2.0 mV/V" without knowing what that meant, you are in good company. The mV/V (millivolts per volt) number is the most-misunderstood spec on a load-cell datasheet — but it is also the spec that decides whether your indicator can read the cell stably, how much resolution you get at the bottom of the scale, and whether you should pay 30% more for a 3 mV/V cell or save the money on the 1 mV/V one.

This is a short reference for buyers and integrators. We define the term, show what range to expect, walk through three examples (truck weighbridge, dairy pan, jewellery), and call out three spec mistakes we have seen at customer sites.

What "mV/V" actually means

Three things follow from the definition that are worth pinning down:

1. Higher mV/V = stronger signal. A 3 mV/V cell produces 50% more output than a 2 mV/V cell at the same load. That makes life easier for the indicator's ADC.
2. The number does not change with load. mV/V is a sensitivity, not an output. It tells you the output-per-volt at full load; you scale linearly for partial loads.
3. The number is nominal, not exact. A datasheet says "2.0 mV/V ± 0.1 mV/V". The actual cell off the production line might be 1.95 or 2.06. This is why every weighbridge needs to be calibrated against known weights after install — the indicator learns the actual sensitivity of your cells, not the datasheet's claim.

Reading a load-cell datasheet

A load-cell datasheet has four numbers that together determine whether the cell fits your application. mV/V is one; the other three are inseparable from it.

The combined error tells you the cell-grade: C2 cells (Class 2) have ~0.02% R.O. error, suitable for general industrial use. C3 cells have ~0.0167% R.O., used for trade-approved weighing. C6 cells are the precision grade for laboratory work.

The three standard mV/V values you will see

Across all the load cells we curate from Zemic, Kevin Sensors, and Green Label CZL, mV/V ratings cluster around three standard values.

Matching the cell to your indicator

The single most common mismatch we see at customer sites is a high-mV/V cell paired with a low-bit indicator. The cell can produce a beautiful signal; the indicator just can't see the detail. You paid for a 3 mV/V precision cell and you are getting 2 mV/V worth of resolution. Money wasted.

The opposite mismatch — low-mV/V cell on a high-bit indicator — is fine. The indicator just has spare resolution. No harm done other than overspecification.

Three worked examples

Example A — 60-tonne truck weighbridge

• Cell choice: 6 × 30-tonne shear-beam, 1 mV/V or 2 mV/V
• Why: trucks are heavy and the resolution requirement is coarse (10 kg minimum graduation is standard). Lower mV/V is fine; what matters more is durability + sealing.
• Indicator pairing: Eagle CFR-02 (24-bit) handles either cell variant.

Example B — Dairy milk-collection pan, 500 kg capacity

• Cell choice: 4 × 200-kg SS shear-beam, 2 mV/V
• Why: 2 mV/V is the general-purpose default. The dairy application needs 0.1 kg graduation (1 part in 5,000), well within 2 mV/V capability.
• Indicator pairing: Eagle Milk-9600 card → EGL-IND-01.

Example C — Jewellery scale, 5 kg capacity, 0.01 g graduation

• Cell choice: 1 × LAKB-series single-point, 3 mV/V (or higher)
• Why: 1 part in 500,000 graduation. Requires both high cell sensitivity AND high-resolution indicator. Mismatching either way kills the precision.
• Indicator pairing: Eagle J800 board with ADS1130 24-bit ADC.

Three common spec mistakes

1. Overpaying for high mV/V on a coarse-graduation application. If your application reads in 10 kg increments, you do not need a 3 mV/V cell. A 1 mV/V or 2 mV/V industrial cell costs less and lasts longer.
2. Mixing mV/V across cells in a parallel-summed weighbridge. The cells must match within ±0.0002 mV/V for the indicator to sum them correctly. A "replacement" cell from a different batch can throw the corner-load calibration off. Always replace cells in pairs or full sets.
3. Specifying mV/V without specifying capacity. A 2 mV/V cell rated at 30 t and a 2 mV/V cell rated at 100 t produce the same output at full load — but the 30 t cell at 30 t is at its limit, while the 100 t cell at 30 t is operating at 30% and has 70% headroom. Always specify capacity + mV/V together.

Five questions to ask your cell vendor

1. What is the actual measured mV/V, not the datasheet nominal? Serious vendors provide per-cell calibration certificates with the as-tested mV/V.
2. What grade — C2, C3, or C6? The grade tells you the trade-approval class.
3. What is the recommended excitation voltage range? Should match what your indicator supplies (usually 5–15 V).
4. Is the cell IP-rated? IP67 for outdoor or wash-down; IP65 for indoor industrial; IP54 for dry indoor.
5. What is the per-cell warranty in months? 18 months is acceptable; 24 months is what curated suppliers offer.

For application-specific cell selection, the team at Eagle Weigh has been curating load cells from three vetted suppliers for two decades. Send us your application — capacity, graduation, environment, indicator — and we will recommend the right cell + grade.

Last updated: June 2026 · Eagle Weigh editorial team