Tank, Silo & Vessel Digital Weight Transmitters – Precision Signal Conversion for Weighing Systems
Digital weight transmitters convert the analogue millivolt signal from one or more load cells into a standardised digital or analogue output — typically a 4–20 mA current loop, RS-232, RS-485, Modbus RTU, or Profibus signal — for direct integration with PLCs, SCADA systems, DCS platforms, and process controllers. In tank, silo, and vessel weighing applications, they replace the traditional weight indicator with a compact, panel or DIN-rail mounted device that feeds weight data directly into the process control infrastructure, enabling automated batching, inventory management, and alarm functions without a separate display unit.
Unlike standalone weight indicators, digital weight transmitters are designed for integration rather than operator interaction. They provide a clean, noise-immune digital weight signal that can be read by any compatible controller, eliminating the signal degradation and interference that can affect long analogue cable runs from load cells to control panels. Many models also include onboard digital filtering, corner correction, and zero/span calibration functions, allowing the transmitter to be configured and calibrated remotely via software or fieldbus communication without physical access to the device.
Our range covers single-channel transmitters for simple tank weighing applications through to multi-channel models capable of handling signals from multiple load cells or vessels simultaneously. ATEX-certified models are available for hazardous area installations in Zone 1, Zone 2, Zone 21, and Zone 22. Whether you are integrating a new tank weighing system into an existing PLC architecture or upgrading an older installation to digital communication, our technical team can advise on the correct transmitter specification for your load cell configuration, communication protocol, and control system requirements.
Key Features
- 4–20 mA analogue output for direct integration with PLCs, DCS, and process controllers
- Digital communication protocols — Modbus RTU, RS-485, RS-232, Profibus, and EtherNet/IP options
- DIN-rail and panel-mount formats for control panel and cabinet installation
- Onboard digital filtering and corner correction for stable, accurate weight signals
- Remote configuration and calibration via software or fieldbus communication
- Multi-channel models for simultaneous monitoring of multiple vessels or load cell groups
- ATEX-certified models for Zone 1, 2, 21, and 22 hazardous area installations
- Wide load cell excitation voltage range compatible with all standard analogue load cells
- Compact, robust construction for long-term reliability in industrial control environments
Common Applications
- Tank and silo weighing integration with PLC and SCADA systems
- Automated batching and dosing — weight-triggered valve and conveyor control
- Inventory management — continuous vessel weight monitoring and data logging
- Loss-in-weight and gain-in-weight process control applications
- Multi-vessel monitoring from a single control panel or SCADA screen
- Retrofit upgrades — replacing analogue indicators with digital process integration
- Hazardous area tank and silo weighing in ATEX-classified zones
All digital weight transmitters are sourced from leading manufacturers and are compatible with our full range of load cells, mounting modules, and junction boxes. Contact our technical team for advice on transmitter selection, communication protocol compatibility, and integration support for your control system.
Frequently Asked Questions
What is a digital weight transmitter and how does it differ from a weight indicator?
A weight indicator is a standalone instrument with a display, designed for operator use — it shows the weight reading and may have basic control outputs. A digital weight transmitter is designed for system integration rather than operator interaction: it converts the load cell signal into a standardised digital or analogue output for a PLC, SCADA, or DCS, with no display of its own. Transmitters are the preferred choice when weight data needs to feed directly into a process control system, and where a separate operator display is not required at the vessel location.
Which communication protocols are supported?
Our range includes transmitters supporting 4–20 mA analogue output, Modbus RTU (RS-485), RS-232 serial, Profibus DP, and EtherNet/IP — covering the most common industrial communication standards used in PLC and SCADA architectures. The correct protocol depends on your control system and network infrastructure — contact our team for compatibility advice if you are unsure which protocol to specify.
Can a digital weight transmitter handle multiple load cells?
Yes. Most transmitters in our range include an internal summing function that accepts signals from multiple load cells (typically up to 8) connected via a junction box, and outputs a single combined weight signal. Multi-channel models are also available for applications where signals from multiple vessels or load cell groups need to be monitored simultaneously from a single device. Contact our team for guidance on the correct configuration for your installation.
How is a digital weight transmitter calibrated?
Most modern digital weight transmitters support both deadweight calibration (using known test weights applied to the vessel) and theoretical calibration (using the load cell sensitivity and capacity data from the calibration certificate, without physical test weights). Theoretical calibration is particularly useful for large tanks and silos where applying test weights is impractical. Calibration is typically performed via a PC configuration tool or fieldbus communication — contact our team for guidance on the calibration procedure for your specific transmitter model.
Are ATEX-certified digital weight transmitters available for hazardous area installations?
Yes. We supply ATEX-certified digital weight transmitters approved for Zone 1, Zone 2 (gas and vapour hazards) and Zone 21, Zone 22 (combustible dust hazards). These are required for tank and silo weighing installations in chemical plants, pharmaceutical facilities, fuel storage, and grain handling environments. Contact our technical team before specifying equipment to confirm the correct zone classification, equipment category, and communication protocol for your installation.
