Platform balances use strain-gauge load cells. Each cell contains a metal spring element, such as aluminum or stainless steel, bonded with resistive strain gauges in a Wheatstone bridge. Load on the platform deforms the element, changing gauge resistance and producing a small voltage proportional to force. One to four cells support the platform, and a junction box sums their signals. The indicator amplifies and digitizes the signal, corrects for temperature and non-linearity, and displays mass. Overload stops protect the cells from shock, and a steel or stainless platform spreads the load. Calibration uses certified test weights, and corner-load adjustment compensates for off-center placement. Indicators may be attached by cable or wireless link and offer functions such as tare, counting, checkweighing and totalizing.
- Bench Platform Balance — A bench platform balance has a platform of about 300 by 400 mm to 400 by 500 mm and capacities from 6 to 60 kg, placed on a workbench.
- Floor Platform Balance — A floor platform balance has a large low platform, typically 600 by 600 mm to 1,000 by 1,200 mm, with capacities from 150 kg to 3 tonnes.
- Stainless Steel Washdown Platform Balance (IP68) — A stainless steel washdown platform balance uses a stainless platform, sealed load cells and an IP68 or IP69K indicator.
- Explosion-Proof Platform Balance (ATEX/IECEx) — An explosion-proof platform balance is designed for areas with flammable gases, vapors or dust, using intrinsically safe or flameproof components.
- Counting Platform Balance — A counting platform balance converts weight to piece count using the average unit weight of a sample.
How do I choose the right variant?
Begin with the heaviest load including the container, then select a capacity about 20 to 30 percent above it, and pick a readability that gives at least 3,000 divisions for general use. Platform size should fit the largest vessel or pallet with margin. Choose material by environment: painted carbon steel for dry areas, stainless steel for wet or corrosive areas. Consider hazardous-area certification if flammable solvents are present, and ingress protection for washdown. Check the indicator functions such as checkweighing, counting and data output, and whether wireless or remote display is needed. For trade use, confirm legal-for-trade approval. Finally, confirm access, such as a ramp for floor models, and overload capacity for drum handling.
Platform Balances are specified in drum and container weighing, bulk material batching, incoming goods inspection, pilot plant weighing, checkweighing of packages and warehouse and dispatch.
Which standards and certifications apply?
Work with Platform Balances is commonly governed by OIML R 76-1, OIML R 60, EN 45501, IEC 60079-0, IEC 61010-1, GB/T 7724 and ISO 9001. Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
Install on a flat, rigid floor or solid bench, and adjust feet until the platform sits evenly on every support. Avoid placing the scale where forklifts, vibrations or drafts disturb readings. Calibrate on site with certified test weights, ideally around 50 to 100 percent of capacity, and check corner loading. Protect cables from damage and moisture, and use junction boxes with appropriate ingress protection. Do not overload or drop heavy items on the platform, since shocks damage load cells. Inspect feet, cells and cables at regular intervals, and clean under the platform to prevent debris from blocking movement. For trade or regulated use, verification by the competent authority and sealing are required.
