IT5405 Series
IT5405 Weighbridge Indicator
Microprocessor-based weighbridge controller with SAP/ERP uplink and dual-stage calibration.
Manufacturing
Built, installed & supported by HMT
Compliance support
Calibration & Legal Metrology guidance
System ready
Automation, ticketing & ERP integration
01Overview
A standalone microprocessor-based weighbridge controller — doesn't need a separate computer system to operate.
02How it works
Turning a tiny electrical signal into a weight reading
A load cell doesn't output a weight — it outputs a very small analog voltage signal, typically a few millivolts per volt of excitation, that varies with the strain on its internal sensing element. The indicator supplies that excitation voltage, reads the returning signal through an analog-to-digital converter, and applies a calibration factor (set during commissioning) to convert that raw signal into a weight value on the display — all of this happening as a standalone microprocessor-based unit, with no separate computer required to operate the scale.
Why dual-stage calibration matters
Dual-stage calibration means the indicator is calibrated first at zero load and again at a known reference load (typically a certified test weight or a known static load), rather than relying on a single-point adjustment. That two-point calibration lets the indicator correctly interpolate weight values across its full range, not just accurately near the calibration point — important for a weighbridge that needs to read correctly for both a light pickup truck and a fully loaded multi-axle vehicle.
Summing multiple load cells into one reading
A weighbridge typically has 6 or more load cells sharing the deck's total load between them. The indicator supports up to 6 load cells at 350Ω wired in parallel, or up to 18 at 1100Ω, summing their combined signal into a single total weight — the indicator doesn't need to know the load distribution across the deck, only the combined electrical signal from every cell wired into it.
03Manufacturing & build quality
Indicators are built around a microprocessor PCB assembly populated with precision analog front-end components (the ADC and signal-conditioning circuitry that reads the load cell's millivolt-level signal accurately despite electrical noise on a busy industrial site), soldered and tested to IPC electronics assembly standards. Firmware is loaded and functionally tested against a simulated load cell signal before the board goes into its enclosure. The housing is built to withstand a weighbridge control-room or gatehouse environment — dust, vibration from nearby vehicle traffic, and in many installations, a degree of temperature and humidity swing — and every unit is run through a communications and calibration test on the bench, exercising its RS232 and optional Ethernet/Modbus interfaces, before it ships.
04Problems it solves
No need for a dedicated PC to run the weighbridge
Because the indicator is a standalone microprocessor unit, a site doesn't need a computer just to capture and display weighments — useful at remote or unmanned sites where maintaining a PC is its own overhead.
Manual data entry into ERP/SAP
Uplinking weighment data directly to MIS, SAP, or ERP systems removes the step of someone manually keying weighbridge tickets into the business system, which is both slower and a source of transcription error.
Uneven readings from multiple load cells
Supporting parallel wiring of up to 6 (350Ω) or 18 (1100Ω) load cells means larger, multi-cell weighbridge decks are read as one consistent total rather than needing separate summing hardware.
Integration gaps with fleet/truck management software
A direct link to Truck Management Software means vehicle identification, weighment data, and ticketing can flow through one connected system rather than being reconciled by hand between separate tools.
05Why it matters
The indicator is the single point where every load cell's raw electrical signal becomes the number that ends up on an invoice, a royalty statement, or a compliance record. If that conversion drifts, or if the data it produces can't reliably reach the business systems that depend on it, the inaccuracy or the manual-entry risk propagates into every transaction the weighbridge supports. A standalone, ERP-integrated indicator removes both failure points at once — accurate at the point of measurement, and connected without a manual hand-off, into the records that matter for billing and audit.
06Salient features
- Support up to 6 load cells (350Ω) in parallel, or 18 load cells (1100Ω)
- Dual-stage calibration
- RS232C communication (RS485, Ethernet, Modbus RTU optional)
- Links with Truck Management Software
- Uplinks data to MIS systems and communicates with SAP & ERP
08Technical file
Need the full technical sheet?
Request drawings, model-specific details and project documentation from the HMT team. A downloadable product file will appear here once approved.
09Complete system
Plan beyond the deck.
A vehicle weighing point can combine the weighbridge with indicator, load cells, traffic management and H-Weigh software for an accountable end-to-end workflow.
08In the field
09Frequently asked
Is it compatible with our existing load cells?
It supports standard 350Ω load cells (up to 6 in parallel) or 1100Ω load cells (up to 18 in parallel) — the great majority of weighbridge-grade load cells on the market fall into one of these two categories, so compatibility is rarely an issue, but it's worth confirming the resistance rating of your specific cells.
What's involved in connecting it to our ERP or SAP system?
The indicator uplinks over its communication interface (RS232C as standard, with RS485, Ethernet, or Modbus RTU available) to MIS/SAP/ERP systems — the specific integration work depends on your ERP's import format and is typically a one-time setup done alongside commissioning.
How often should calibration be checked?
Calibration should be checked on the same periodic schedule as the weighbridge structure itself (commonly annually, or per local trade-legal requirements), and re-verified after any load cell replacement or significant electrical work on the system.
Does it need a stable power supply or backup?
Like any electronic weighing instrument, it benefits from a stabilised power supply and, ideally, UPS backup — a power interruption mid-weighment is a common cause of lost or disputed tickets at sites without one.
Can it be mounted outdoors near the weighbridge, or does it need to be indoors?
The indicator itself is typically installed in a gatehouse, control room, or weatherproof enclosure rather than directly exposed to the weather — it's the load cells and junction boxes that are rated for outdoor exposure, not the indicator's own housing.
10Industries this serves
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