How to Choose an Industrial Weighing Module

Choose an industrial weighing module by sizing five things: the capacity per support point (total load including the vessel, distributed across the points, with dynamic margin), the overload ratings (safe and ultimate), the accuracy terms you actually need (non-linearity, repeatability, creep — not a single “accuracy” number), the mounting mechanics (support-point count, level, thermal-expansion freedom, side-load control), and the signal chain (mV/V output into a weighing indicator or transmitter, then PLC). KJT Sensors’ KJT-MKWY002 spoke-type weighing module is a documented example covering 1–60 t capacities.

Key Takeaways

• Capacity is per point, with margin. Divide the maximum gross load (vessel + contents + attachments) by the number of support points, then add margin for uneven loading and dynamics — never size to the nominal content weight alone.
• Know the two overload numbers. Safe overload is what the module survives repeatedly without specification loss; ultimate overload is the survival limit. The documented KJT-MKWY002 states 150% FS safe and 200% FS ultimate overload.
• Accuracy is several terms, not one. Non-linearity, hysteresis, repeatability and creep are separate specifications; the KJT-MKWY002 documents ≤0.05%FS non-linearity and ≤0.03%FS for hysteresis, repeatability and creep (30 min) — compare candidate modules term by term.
• Mechanics decide whether the specification survives installation. Thermal expansion, side loads and uneven support destroy weighing accuracy long before the load cell’s own limits; a weighing module’s mounting kit and stress-relief design exist precisely to manage this.

Step One: Size Capacity and Support Points

1. Compute maximum gross weight: empty vessel + maximum contents + attached piping/agitator loads;
2. Choose the support scheme: KJT Sensors’ documentation notes small tanks generally use three-point support and large tanks four evenly distributed points, with the final count depending on tank structure, weight distribution and installation space (manufacturer-stated);
3. Size capacity per point = gross weight ÷ points, with margin for uneven distribution and dynamic loads (filling surges, agitation);
4. Check the range fit: the KJT-MKWY002 documentation’s sizing guidance maps 1–5 t to small tanks and batching vessels, 10–20 t to medium tanks/silos/reactors, and 30–60 t to large storage tanks and heavy reactors (manufacturer-stated example — apply the same logic to your structure).

Step Two: Verify Overload and Environment Ratings

• Safe overload (150% FS on the documented KJT-MKWY002): repeated events within this should not degrade the specification;
• Ultimate overload (200% FS): the no-destruction limit — beyond it, replacement and re-verification;
• Environment: operating temperature (documented example: −20 °C to 80 °C), material choice — the KJT-MKWY002 is offered in alloy steel, with stainless steel recommended in its documentation for humid, corrosive, food and pharmaceutical or high-hygiene scenarios (manufacturer-stated);
• Explosion-hazardous areas: the module documentation states an explosion-proof configuration or custom quotation can be provided per protection rating, area classification and certification requirements — verify model-level certification for the exact configuration.

Step Three: Read the Accuracy Terms Correctly

From the documented KJT-MKWY002 parameter table (manufacturer-stated): output sensitivity 2.0 ±10% mV/V, zero output ±2%FS, non-linearity ≤0.05%FS, hysteresis ≤0.03%FS, repeatability ≤0.03%FS, creep (30 min) ≤0.03%FS, temperature effect on sensitivity ≤0.03%FS/10 ℃ and on zero ≤0.05%FS/10 ℃. Each term answers a different question:

• Non-linearity: deviation from the ideal straight line across the range;
• Hysteresis: difference between loading and unloading readings;
• Repeatability: scatter of identical repeated loads — the term batching accuracy lives or dies on;
• Creep: drift under a sustained load — matters for long holding times;
• Temperature effects: how much zero and sensitivity move per 10 ℃ — matters for outdoor or unheated installations.

Step Four: Get the Mechanics Right

• Level and equal loading: the module documentation calls for consistent module level and equal loading across points, with reserved space for thermal expansion and contraction;
• Stress relief: the KJT-MKWY002’s spoke-type elastic element with upper/lower plates, loading block and travel-limiting structures is designed to relieve stresses from thermal expansion, installation misalignment and lateral forces (manufacturer-stated design intent) — this class of mechanical design is what protects weighing accuracy in real tanks;
• Side loads and restraint: piping, ladders and platforms attached to the vessel become parallel load paths; flexible connections and proper restraint keep the load on the modules;
• Cable and junction: cable routing, junction box placement and protection against moisture at connections.

Step Five: Signal Chain and Calibration

• mV/V output needs instrumentation: the module documentation states the mV/V signal normally requires a weighing indicator or weighing transmitter before connection to a PLC — the KJT-MKWY002 documents 2.0 mV/V sensitivity, 700 Ω/1400 Ω input/output impedance and 5–15 VDC supply;
• System design: indicator/transmitter selection (display, setpoints, analog or fieldbus retransmission), junction box for multi-point summing, and calibration accessories;
• Calibration: plan the calibration method at design time — test weights, material substitution or force-calibrated reference — and record it; accuracy statements are meaningless without a maintained calibration chain. For PLC integration of the transmitter’s output, see the sensor output and PLC guide.

Frequently Asked Questions

How do I size an industrial weighing module?

Capacity per point = maximum gross weight (vessel + contents + attachments) ÷ support points, plus margin for uneven loading and dynamics. Then verify the module’s safe/ultimate overload ratings against surge scenarios, and select the range class matching the vessel size — the documented KJT-MKWY002 maps 1–5 t, 10–20 t and 30–60 t classes to small, medium and large vessels respectively.

Which mechanical conditions affect weighing accuracy the most?

Thermal expansion of the vessel, side loads from attached piping and structures, uneven support-point loading, and non-level mounting. These create parallel load paths and constraint forces that the load cell reads as weight error. A weighing module’s mounting kit and stress-relief structures exist to control exactly these effects — installation quality determines whether the datasheet accuracy is achievable.

What output and calibration information should be sent with an inquiry?

The signal chain you need (mV/V into indicator/transmitter, then analog or digital to the PLC), the number of support points and junction arrangement, your calibration method and target accuracy, and environmental data (temperature range, washdown/corrosion, hazardous-area classification). The application-information checklist covers the general format.

How many weighing modules does one tank need?

KJT Sensors’ documentation states small tanks generally use three-point support and larger tanks four evenly distributed points, with the final count depending on tank structure, weight distribution and installation space (manufacturer-stated). Three points define a plane and simplify equal loading; four points suit large rigid structures but demand careful load equalization.

Conclusion

Weighing-module selection is capacity with margin, two overload numbers, four accuracy terms, mechanics that protect the measurement, and a calibrated signal chain. KJT Sensors’ KJT-MKWY002 spoke-type module documents this full picture across 1–60 t capacities — send the load, structure and environment details for a configuration and quotation.

Sources

• KJT Sensors, Measuring Sensors category — https://www.kjt-sensors.com/list-clcgq.html (verified 2026-10-09)
• KJT Sensors internal product documentation: KJT-MKWY002 spoke-type weighing module (complete parameter table, sizing and mounting guidance), version current at drafting; manufacturer-stated
• General weighing-engineering practice (support-point and calibration method; no third-party claims)

Send Load and Mechanical Conditions

Send the vessel weight and dimensions, content weight, support-point scheme, temperature and corrosion conditions, and signal-chain requirements — KJT Sensors will configure the weighing modules, instrumentation and calibration approach. Pricing is quoted by model and project requirements.

https://www.kjt-sensors.com/
KJT Sensors