Air-cargo checkweighers must weigh palletised and containerised freight from 100 kg up to 3000 kg with dynamic accuracy in the 0.05-0.1% range while surviving the dust, vibration and forklift impacts of a ramp-side environment [S3].
Unlike food-line checkweighers, the air-cargo use case centres on ULD (unit load device) build-up, weight-and-balance (W&B) data export to airline load-control software, and integration with conveyor or roller-top sorter lines running at 0.5-2.0 m/s [S1].
Air-cargo checkweigher duty cycle and load profile
Cargo manifests typically span single-piece mail bags of 5-30 kg, narrow-body ULDs (AKE/LD3) at 1200-1600 kg, and wide-body main-deck pallets (PMC, P1P) at 3000-5400 kg loaded maximum; checkweigher capacity should be selected at roughly 1.25-1.5x the heaviest expected ULD to keep dynamic error below 0.1% [S3].
Throughput in a cargo terminal commonly runs 60-180 ULDs per hour on a build-up line, with peak surges during night-cuts; a checkweigher rated for at least 200 weighings per minute is a common specification, although actual line speed is governed by upstream fork-truck and conveyor pacing, not the scale itself [S1].
Selection criteria vs food-line checkweighers
Air-cargo environments share the load-cell, conveyor, and rejector architecture used in food plants (HC-M, HC-A, EC-E series, and the heavier load variants described in OEM catalogues) but differ in three concrete respects: ingress protection must reach IP65 minimum because ramp dust and rain ingress is routine, weighing surfaces need roller-top or belt-top decks rated for forklift wheels rather than stainless wash-down pans, and W&B data export requires airline load-control protocol support (typically ARINC 828 or airline-specific formats) on top of the standard serial/Ethernet/PLC outputs [S1][S3].
For readers comparing this duty against packaged-food lines, the broader accuracy-class and hygiene framework is covered in Checkweigher selection for food and beverage: 2026 spec gates, accuracy classes; the air-cargo build diverges at the platform-deck and hazardous-area layers.
Hazardous-area, EMC and structural requirements
Checkweighers installed within 3 m of fuel hydrants, into Category 2 / Zone 1 rated cargo pits, or on apron-side conveyor lines must carry ATEX 2014/34/EU or IECEx certification for Group II, Cat 2 (Zone 1) when gasoline vapour may be present, with load cells and indicators rated to the same category [S1].
Where ATEX is not mandated, the platform still needs a stainless or galvanised welded frame, welded-seal load cells (IP67/IP68) and surge-protected signal lines to survive forklift impact and ramp lightning transients; OEM heavy-load checkweigher series are described as having a solid stainless steel option for wet areas, a useful proxy for ramp-drainage exposure even when formal wash-down is not required [S3].
Comparison: cargo checkweigher classes by decision criteria
For air-cargo spec writing, the realistic options compress to three classes, and the difference is structural rather than electronic: (a) low-profile platform scales (200-600 kg) sized to single-piece and small-carton freight, used at manual build-up stations, with ±0.05 kg readability and 4-20 mA or serial output; (b) roller-top conveyor checkweighers (1000-3000 kg) integrated into the ULD build line, with ±0.1-0.2% dynamic accuracy and Ethernet/Profinet output to the W&B system; (c) floor / pit-mounted heavy-load checkweighers (3000-5400 kg) used for main-deck pallet verification, with ±0.05% static accuracy and a 1.5-2.0 m roller or belt deck [S1][S3].
Decision rule: if the line is pallet-build at 60+ ULD/h, specify (b); if the duty is single ULD pre-weighing or final W&B verification of a loaded pallet, specify (c); if the duty is small-parcel sortation inside a courier-airline terminal, specify (a) [S1][S3].
Integration with airline load-control and baggage-handling systems
Output options cited for airport-grade platform scales cover USB, serial (RS-232/422/485), Ethernet, keyboard wedge, PLC setpoints and relays, and REST API for direct hand-off to a host system [S1]. For W&B hand-off, an Ethernet output carrying either the airline's native load-control schema or a parsed ARINC 828 payload is the practical minimum; legacy RS-232 to a local terminal is still common in older terminals but is increasingly displaced by Ethernet.
Conveyor-integrated cargo checkweighers should expose both a weigh-completed pulse (for upstream reject or divert logic) and a continuous weight stream, because ramp-side diverters are uncommon and the data, not the physical reject, drives the load-control decision [S1][S3].
What a checkweigher cannot do in an air-cargo terminal
Dynamic weighing on a moving roller or belt top cannot match the legal-for-trade accuracy achievable on a static floor scale; a 0.05% static floor-scale reading is not equivalent to a 0.1% dynamic checkweigher reading, and a regulator will treat them differently for W&B cross-check purposes [S3].
Checkweighers also cannot replace aircraft weighing (which is a separate mass-and-balance exercise on the aircraft itself) and should not be specified as a primary W&B source for flight-dispatch decisions without a documented static cross-check at a defined cadence [S1].
Trackable signals for the next procurement cycle
Two signals are worth tracking before placing a 2026-2027 air-cargo checkweigher order: (1) ARINC 828 conformance statements from cargo-scale vendors, which are still patchy across the industry; (2) IECEx/ATEX certification currency on heavy-load (3000+ kg) roller-top platforms, because the most common wide-body ULD ratings still trail the lighter categories in formally certified options. [S3]
Detailed specification references: checkweigher, air pick, and air impact wrench.