What is the AS3304 Automated Weighing System?

The AS3304 is a freestanding automated laboratory weighing system developed for applications where large numbers of samples must be weighed with high precision.

Instead of manually transferring each sample to an analytical balance, waiting for a stable reading, recording the weight and repeating the procedure for every sample, the AS3304 automates the weighing process.

The system combines:

• A high-precision analytical balance.
• Automated sample transport.
• Four sample tray positions.
• A controlled weighing enclosure.
• Temperature and humidity monitoring.
• Automated weighing software.
• An integrated computer.
• Automatic weight recording and data export.

This makes the AS3304 particularly suitable for gravimetric laboratory methods that require many individual weighing operations and reliable weight records.

Key Features of the AS3304

• Fully automated precision weighing.
• Total capacity of up to 120 samples in the standard workflow.
• Balance resolution: 0.01 mg (five decimal places in grams).
• Maximum balance capacity of 320 g.
• Environmentally controlled weighing enclosure.
• Temperature and humidity monitoring.
• Four sample tray positions.
• Automatic tray identification using barcode readers.
• Automatic sample weight recording.
• CSV data output.
• Configurable weighing methods.
• Automatic balance correction functionality.
• Remote balance display.
• Compatible with Total Suspended Solids workflows.
• Compatible with Total Dissolved Solids workflows.
• Suitable for general precision weighing applications.
• Custom weighing adapters available for specialized applications.
• Fully integrated computer with external monitor, mouse and keyboard.

Automated Precision Weighing with 0.01 mg Resolution

One of the defining features of the AS3304 is its high-resolution weighing system.

The integrated precision balance provides:

• Resolution: 0.01 mg.
• Maximum capacity: 320 g.
• Automated balance calibration functions.
• Check-weigh functionality.
• Internal mass correction capability.

This level of resolution is particularly important for gravimetric methods where the analytical result is calculated from relatively small differences between initial and final sample weights.

Why High-Resolution Weighing Matters

In gravimetric analysis, the final result is often determined from the difference between two measurements:

Mass difference = final weight − initial weight

When the mass of material being measured is very small, even minor weighing variation can have a significant influence on the calculated analytical result.

By using a 0.01 mg resolution balance within an automated and controlled weighing environment, the AS3304 is designed to support highly consistent weight determination for demanding laboratory methods.

Controlled Weighing Environment for Precision Measurements

High-resolution weighing can be influenced by environmental conditions such as:

• Air movement.
• Temperature variation.
• Humidity variation.
• Static electricity.
• Operator movement around the balance.

The AS3304 therefore performs weighing inside a controlled enclosure designed for precision balance operation.

The system monitors environmental conditions, including temperature and humidity, helping laboratories maintain controlled conditions during weighing.

Reduced Operator Influence

In conventional manual weighing, opening the balance enclosure, handling samples and moving around the weighing area can disturb the weighing environment.

With automated sample handling, samples can be repeatedly transferred to and from the balance without constant operator intervention.

This supports more consistent weighing conditions throughout large sample batches.

Automated Handling of Up to 120 Samples

The AS3304 is equipped with four sample tray positions.

For the standard Total Suspended Solids configuration, each tray can accommodate 30 samples, providing a total automated capacity of:

4 trays × 30 samples = 120 samples

Alternative tray and adapter configurations may also be available for different laboratory applications.

Barcode Identification of Sample Trays

The system includes four barcode readers for tray identification.

Automatic tray identification helps the software associate samples and weighing data with the correct tray during automated processing.

Standard Tray Dimensions

The standard tray dimensions are approximately:

• 396 mm wide.
• 496 mm deep.
• 32 mm high.

Four trays are included in the standard system configuration.

Automated Weighing for Total Suspended Solids (TSS)

Total Suspended Solids (TSS) is one of the primary applications for the AS3304 automated weighing system.

TSS analysis is a gravimetric method used to determine the quantity of suspended material present in a liquid sample.

A typical laboratory workflow involves:

1. Weighing a clean filter before filtration.
2. Filtering a defined volume of sample.
3. Drying the filter containing the retained suspended solids.
4. Cooling the filter under appropriate conditions.
5. Reweighing the filter.
6. Calculating the mass increase caused by the retained solids.

When many samples are processed every day, the repeated weighing stages can consume significant technician time.

The AS3304 automates the precision weighing component of this workflow, allowing large batches of filters or sample containers to be weighed consistently with minimal manual intervention.

Tray-Based TSS Workflow

The 30-position trays used for Suspended Solids workflows can be transferred between the automated weighing system and the laboratory drying process.

After drying and cooling according to the laboratory method, the tray can be returned to the AS3304 for automated final weighing.

The system then records the new weights for subsequent calculation or data processing.

Automated Weighing for Total Dissolved Solids (TDS)

The AS3304 can also be configured for Total Dissolved Solids (TDS) gravimetric workflows.

TDS determination typically involves evaporating a defined volume of filtered sample and measuring the mass of the residue remaining after drying.

As with TSS analysis, accurate measurement depends on reliable initial and final weighing.

Automating these repetitive weighing operations can be particularly beneficial for environmental and water-testing laboratories processing large daily sample volumes.

How Does the Automated Weighing Process Work?

The AS3304 combines robotic sample handling, a precision weighing cell and computer-controlled software into a single automated workflow.

A typical automated sequence can include:

1. Loading sample trays into the system.
2. Automatic identification of trays.
3. Selection of the required weighing method.
4. Automated transfer of each sample to the precision balance.
5. Balance stabilization.
6. Automatic weight measurement.
7. Automatic recording of the measured value.
8. Return of the sample to its tray position.
9. Processing of the next sample.
10. Export of completed weighing data.

Once the trays and method have been prepared, the system can process large sample batches without requiring an operator to manually weigh each sample individually.

Automatic Data Recording and CSV Export

Manual weighing involves more than placing samples on a balance. Each measurement must also be correctly recorded and associated with the corresponding sample.

The AS3304 automates this part of the workflow.

The system:

• Automatically captures sample weights.
• Associates measurements with the automated weighing sequence.
• Stores weighing information electronically.
• Outputs data into an easy-to-understand CSV file.

CSV files can be opened using common spreadsheet and laboratory data-processing software, simplifying subsequent calculations, quality checks and reporting.

Reducing Manual Transcription

Automatic data capture also removes the need for laboratory technicians to repeatedly read a balance display and manually enter each result into a spreadsheet.

This helps simplify workflows involving tens or hundreds of individual weight measurements.

Configurable Method Builder

Not every laboratory uses the same weighing procedure. The AS3304 therefore includes a configurable method builder that allows the weighing process to be adapted to different testing requirements.

Depending on the application, parameters associated with the weighing process can be configured to create an appropriate automated method.

This makes the AS3304 useful not only for predefined Suspended Solids applications but also for other laboratory procedures requiring automated precision weighing.

General Precision Weighing

The manufacturer specifies the system as suitable for general weighing applications in addition to TSS and TDS methods.

For specialized sample containers or workflows, custom weighing adapters can also be supplied on request.

Automated Calibration and Weighing Quality Control

Reliable precision weighing requires regular verification that the balance continues to perform correctly.

The AS3304 incorporates several functions designed to support balance monitoring and quality control.

Automatic Calibration

The precision weighing cell supports automated calibration, reducing the need for repetitive manual calibration procedures.

Check-Weigh Function

A check-weigh function can be used to verify the performance of the weighing cell at defined intervals.

This provides an additional check that weight data remain within the expected operating conditions.

Internal Mass Correction

The weighing system also incorporates internal mass correction functionality for applications where this capability is required as part of laboratory weighing practices.

Remote Balance Display

A remote balance display is provided, allowing operators to view balance information while the automated system is operating.

Applications of the AS3304 Automated Weighing System

The AS3304 can be used in laboratories requiring high-precision gravimetric measurements and large numbers of repetitive weighing operations.

Typical applications include:

• Total Suspended Solids (TSS) analysis.
• Total Dissolved Solids (TDS) analysis.
• Environmental water testing.
• Wastewater analysis.
• Water-quality laboratories.
• High-throughput gravimetric analysis.
• Filter weighing.
• Test-tube weighing.
• General precision laboratory weighing.
• Custom gravimetric applications using dedicated weighing adapters.

Environmental and Water Laboratories

The AS3304 is particularly relevant to environmental laboratories where gravimetric TSS or TDS measurements may involve large daily batches of samples.

High-Throughput Testing Laboratories

Laboratories processing repetitive weighing tasks can use automation to move technician time away from repeated balance operations and toward sample preparation, quality control and analytical review.

AS3304 Technical Specifications

Specifications are based on current manufacturer information and may vary according to tray, weighing adapter and application configuration. Please confirm the required configuration before ordering.

Benefits of Automated Precision Weighing

Manual Weighing vs. AS3304 Automated Weighing

When Should a Laboratory Consider the AS3304?

The AS3304 is particularly suitable for laboratories where:

• Large numbers of samples must be weighed every day.
• Balance resolution of 0.01 mg is required.
• TSS or TDS is routinely determined by gravimetric methods.
• Manual weighing is creating a significant workload.
• Consistent weighing conditions are important.
• Weight data must be captured electronically.
• Long automated sample batches are desirable.
• Laboratory productivity needs to increase without adding repetitive manual weighing tasks.

The exact AS3304 configuration should be selected according to sample type, container dimensions, laboratory method, required sample capacity and data-management requirements.

Frequently Asked Questions About the AS3304