Designed with Siemens Weighing Technology and Licence

Instrowest Weightometer

High-accuracy conveyor belt weighing for mining and bulk materials handling. Designed, installed, aligned, and calibrated by our team to deliver accurate, repeatable measurement in the harshest conditions.

Request a Quote Fill Out RFQ Form

Complete the RFQ form and send it to our sales team to receive a tailored quotation.

Discover the System

A Complete, Purpose-Built Weighing System

The Instrowest Belt Weightometer is not an off-the-shelf product. Every system is engineered and commissioned for its specific application, with every component selected to minimise uncertainty and maximise long-term accuracy.

From weigh frame selection and idler alignment through to speed sensor configuration and chain calibration, Instrowest manages the entire process end to end.

Every system includes:

Weigh Frame Idler Frames & Rollers Speed Sensor Integrator Calibration Chain System
Instrowest Weightometer installed at mine site
Field-Proven Installation
Our Process

From Inquiry to Installation, We've Got You Covered

01
Fill Out the RFQ Form

Tell us about your conveyor, application, and accuracy requirements. The more detail you share, the better we can size the right system for your site.

Download RFQ Form
02
Engineering & Sizing

Our team reviews your conveyor data and sizes every component correctly, including load cells, chains, integrator selection, and lead-in/lead-out idler configuration.

03
Installation & Alignment

Instrowest technicians install and string-line the full weigh area to exacting tolerances. Every idler is aligned horizontally and vertically to distribute load evenly.

04
Calibration & Commissioning

Full chain calibration of the complete weigh area under real operating conditions, with documentation provided. Ongoing calibration support available.

Accuracy Options

Choose the level of precision your operation demands. Every option is engineered, installed, and commissioned by Instrowest to meet its stated accuracy under real operating conditions.

0.5%
Standard Accuracy
BW500 Basic

Single idler, dual load cell. 4-20 mA rate output and pulse totaliser. For process monitoring and production weighing. Available in AC and DC versions.

Process Monitoring
0.25%
High Precision
BW500 Full Feature

Dual idler, quad load cell. Two weigh frames in series. Four independent loadcell inputs and full I/O suite. For reconciliation and accounting applications.

Reconciliation & Accounting
0.125%
Ultra-High Precision
Custom Configuration

For applications with the most demanding accuracy requirements. Engineered on a case-by-case basis. Contact our team to discuss your specific process needs.

Demanding Applications

Engineered to Perform.
Built to Last.

Each system is engineered and commissioned for its specific application, with every component selected to minimise uncertainty and maximise long-term accuracy. No two installations are identical.

Fully Floating Frame

No pivot points to seize or corrode. Eliminates the fulcrum effect and the increased zero drift found in pivoting frame designs used by other manufacturers.

316 Stainless Steel Construction

Weigh frames constructed entirely from 316 stainless steel, designed to outlast the conveyors they are installed on, even in the harshest environments.

Balanced & Adjustable Rollers

Machined and dynamically balanced weigh rollers with jacking screws allow the entire weigh area to be aligned with exact precision, reducing vibration.

3+3 Lead-In / Lead-Out Idlers

Superior to the 2+2 standard, especially above 2.5 m/s belt speed. Ensures weight is distributed evenly across the entire weigh area for maximum consistency.

Correct Load Cell Sizing

Properly sized cells maximise integrator resolution and handle off-centre loads and minor belt tracking variation without sacrificing measurement accuracy.

Minimal Frame Surface Area

Compact design reduces debris accumulation, a primary driver of zero drift and jamming on bridge-style frames commonly used by other manufacturers.

Weigh Frame Technology

Dual-Idler Design

Triple parallelogram-style load cells react instantly to vertical forces, delivering outstanding accuracy even with uneven loading and high belt speeds. Drop-in installation with four bolts per frame, no moving parts, minimal maintenance.

Fully Floating Frame

No pivot points to seize or corrode. Eliminates the fulcrum effect and increased zero drift found in pivoting frames.

Correct Location

Instrowest technicians select the optimum installation location on the conveyor to get the best results from the outset.

Balanced Rollers

Machined and dynamically balanced. Jacking screws for perfect alignment. Instrowest string-lines every weigh area on installation.

Precision Installation

Instrowest installs and aligns the entire weigh area to exacting standards to ensure ongoing measurement accuracy.

Instrowest idler frames installed at mine site
Calibration chain
Chain close-up
Chain on belt
Chain weigh area

Calibration Chain
Deployment System

The Instrowest Calibration Chain Deployment System applies a known kg/m load across the entire weigh area, including lead-in and lead-out idler frames, accurately simulating material on the belt under real operating conditions.

Unlike static test weights, chain calibration accounts for belt tension, installation variances, and the forces present during normal operation, giving a true picture of weightometer performance.

Designed for seamless integration with all Instrowest belt weightometer installations, the system is fully deployed on-site by Instrowest technicians, ensuring accurate, repeatable results with minimal disruption to your operation.

Full Installation Coverage
Drag and roller chain configurations sized to suit your conveyor. Calibrates the entire weigh area, not just the load cells.
Wide Capacity Range
Available from 6 kg/m up to 500 kg/m to match your process requirements across any application.
Reduced Downtime and Costs
Faster and more repeatable than manual chain placement. Time savings during calibration reduce your overall R.O.I. timeline.
Safer Site Deployment
No crane required. Guarding remains in place throughout. Personnel are kept clear of the line of fire at all times.
Instrowest Speed Sensor
Measurement

Instrowest Speed Sensor

A compact, low-profile, wheel-driven return belt speed sensor built to last. A proximity switch on an offset swing arm detects wheel rotation, generating a pulse signal proportional to belt speed and transmitting it directly to the integrator.

Designed with multiple proximity switch options (NPN, PNP and NAMUR), allowing it to suit a variety of integrator manufacturers and models without additional signal conditioning.

Greasable wheel bearing
Heavy duty pivot point
Easily replaceable proximity switch
Cable protected within arm
Easily exchangeable wheel
NPN, PNP and NAMUR proximity options
Download Datasheet
Computation

Siemens BW500 Integrator

Every Instrowest Weightometer includes a Siemens microprocessor-based weighing integrator. It continuously computes load cell and speed sensor inputs to display flow rate (TPH), totalised weight, belt load, and belt speed.

Supplied pre-installed in a stainless steel enclosure for long-term protection in harsh outdoor environments.

0.5%
BW500 Basic

Two load cell inputs, 4-20 mA rate output, pulse output for totalised tonnes. Available in AC and DC versions.

0.25%
BW500 Full Feature

Four independent loadcell inputs. Full I/O suite including additional inputs and outputs for sensors such as inclinometers.

Download Datasheet
See It In Action

Watch the Instrowest Weightometer Series

Get in Touch

Request a Quote or Talk to Our Team

Whether you are specifying a new installation, looking to upgrade an existing weightometer, or need calibration support for your operation, our team is ready to help across Australia.

Direct Contact
(08) 9500 9120
sales@instrowest.com.au www.instrowest.com.au
The fastest way to get your quote:

→ Download the RFQ Form, fill it out, and send it to our team.

Request a Quote

Common Questions

Frequently Asked Questions

What is the difference between a single-idler and dual-idler weightometer?
A single-idler weightometer uses one weighing idler and two load cells, achieving standard accuracy of 0.5%. A dual-idler system uses two weighing frames in series with four load cells, achieving high precision of 0.25%. Dual-idler systems are better at handling off-centre loads and minor belt tracking variations, making them the preferred choice for reconciliation and accounting applications.
Why does Instrowest use calibration chains rather than static test weights?
Calibration chains simulate a known kg/m load across the full weigh area, including lead-in and lead-out idlers, under real belt tension conditions. Static weights only calibrate the load cells themselves and do not account for belt tension, idler spacing, alignment variances, or the horizontal and vertical forces present when product is running. Chains give a far more accurate and representative calibration result.
How often should a belt weightometer be calibrated?
For reconciliation weightometers used for accounting purposes, Instrowest recommends monthly calibration. For all other weightometers, calibration intervals exceeding three months are not recommended due to changes in environmental conditions, belt tension, and general mechanical wear over time.
What is the advantage of a fully floating weigh frame over a pivoting frame?
Pivoting frames introduce an additional area of uncertainty into the measurement. The pivot points can seize, wear, or corrode over time, causing accuracy drift. The fulcrum effect also means debris build-up on surfaces away from the pivot amplifies zero drift. Fully floating frames have none of these failure modes. There are no moving parts to corrode or seize, and zero drift caused by debris build-up is far less pronounced.
Can the Instrowest Weightometer be retrofitted to an existing conveyor?
Yes. The weigh frame uses a simple drop-in installation secured with four bolts per frame, and an existing idler is attached to the dynamic beam. This means installation is straightforward on most existing conveyor structures. Our team will assess the conveyor layout beforehand to identify the optimal weigh area location and confirm compatibility.
What makes the Instrowest Speed Sensor different from other options on the market?
The Instrowest Speed Sensor is a compact, low-profile, wheel-driven return belt sensor designed for long service life in tough conditions. It features a greasable wheel bearing, heavy-duty pivot point, and easily replaceable proximity switch, with the cable routed inside the arm for protection. Multiple proximity switch options (NPN, PNP and NAMUR) allow it to interface with a wide range of integrators and DCS systems without additional signal conditioning.
What calibration chain capacity range is available?
Instrowest calibration chains are available from 6 kg/m up to 500 kg/m, covering light to very heavy-duty bulk materials handling applications. Both drag chain and roller chain configurations are available. Contact our team with your belt width and capacity requirements for a precise chain sizing recommendation.