Energy costs are often visible only at the level of the monthly electricity bill. While this shows how much energy a facility has consumed, it rarely explains which machines, pumps, production lines, tenants or building services are responsible.

Installing energy meters at selected electrical circuits provides a more useful level of visibility. The ADL200N/ADL200M single-phase RS485 energy meters and ADL400N/ADL400M three-phase RS485 energy meters allow electrical parameters and accumulated energy consumption to be measured closer to the equipment or process where the energy is actually being used.

The models discussed in this article are restricted to those identified in the supplied Australian RCM compliance documentation. The single-phase declaration covers the ADL200N and ADL200M families, while the corresponding three-phase declaration covers the ADL400N and ADL400M families, including listed external-current-transformer variants.

These meters can operate as standalone panel instruments, but their greater value comes from RS485 Modbus RTU communication. This allows electrical measurements to be incorporated into PLCs, HMIs, building management systems, SCADA platforms, industrial gateways and cloud-based energy-monitoring systems.

What can RS485 energy meters measure?

Depending on the selected model and configuration, the meters can measure and communicate parameters including:

• Voltage and current
• Active power
• Reactive power
• Apparent power
• Power factor
• Frequency
• Forward and reverse active energy
• Forward and reverse reactive energy
• Phase-level energy information on supported three-phase models
• Accumulated electrical energy

The ADL200N and ADL400N documentation identifies RS485 Modbus RTU communication, configurable device addresses and communication speeds suitable for integration into a multi-device monitoring network.

This means the meter is not limited to displaying values at the switchboard. The information can be collected, recorded, compared and used by a wider monitoring or control system.

Applications for RS485 energy meters

1. Individual machine monitoring

A factory may know its total electricity consumption but still have little visibility into individual machinery.

An energy meter can be installed on the supply to equipment such as:

• CNC machines
• Packaging machinery
• Mixers
• Conveyors
• Ovens
• Dust collectors
• Fans
• Refrigeration equipment
• Process skids

The ADL200N/ADL200M single-phase meters can be used for suitable single-phase equipment, while the ADL400N/ADL400M three-phase meters are better suited to industrial machinery operating from a three-phase supply.

Monitoring individual machines can help answer practical questions:

• Which machine is consuming the most energy?
• Is equipment operating while production is stopped?
• Has energy consumption increased since the last maintenance period?
• How much energy does the equipment consume per shift or batch?
• Is the machine operating under a different electrical load than normal?

The meter does not diagnose the mechanical condition of the machine by itself. However, changes in current, power, energy consumption or power factor can provide useful evidence that further investigation is required.

2. Production-line energy monitoring

For many manufacturers, energy consumption is treated as a general factory overhead because it is not measured at the production-line level.

Installing a three-phase RS485 energy meter on each production-line feeder allows electricity use to be compared against:

• Production volume
• Operating hours
• Product type
• Shift
• Batch
• Machine utilisation

When the energy data is integrated with a PLC, production counter or manufacturing dashboard, a facility may calculate indicators such as energy used per tonne, per component, per batch or per operating hour.

This information can support production benchmarking and help identify lines that consume unusually high energy for the amount of output being produced.

3. Pump and water-system monitoring

Pumps are used throughout commercial buildings, industrial facilities, pools, water-treatment plants, irrigation systems and wastewater infrastructure.

Common applications include:

• Circulation pumps
• Transfer pumps
• Booster pumps
• Bore pumps
• Irrigation pumps
• Filter pumps
• Dosing pumps
• Wastewater pumps

An energy meter installed at the pump feeder can measure electrical input, but the most useful insight is created when this data is combined with process information.

For example:

• A flow meter measures the volume of water being moved.
• A pressure sensor measures the system pressure.
• A level sensor shows tank or bore conditions.
• The RS485 energy meter measures the pump’s electrical demand.
• The pump controller or PLC records operating commands and alarms.

Together, these measurements can help identify reduced pumping efficiency, blocked filters, excessive cycling, unexpected operation or a gradual increase in the energy required to move the same amount of water.

For smaller single-phase pumps, an ADL200N or ADL200M may be suitable. Larger three-phase pumps would generally use an ADL400N or ADL400M.

4. Commercial building submetering

A commercial building usually contains a mixture of single-phase and three-phase loads distributed through main switchboards, floor boards and local distribution boards.

Potential monitoring points include:

• Main incoming supply
• Individual floors
• Mechanical services
• Lighting boards
• Air-conditioning systems
• Lifts
• Data rooms
• Commercial kitchens
• Carparks
• EV charging equipment
• Tenant distribution boards

A building-level monitoring system can use three-phase meters at main and floor distribution boards, with single-phase meters applied to smaller outgoing circuits.

The result is a more useful picture of where energy is being consumed. Rather than viewing the facility as a single load, the operator can separate HVAC, lighting, tenant, mechanical and equipment consumption.

The building-monitoring architecture in the supplied solution documents illustrates this layered approach, with meters positioned across incoming supplies, floor distribution boards and individual services such as HVAC, lighting, data rooms, lifts and EV charging systems.

5. Tenant and departmental energy allocation

In a multi-tenant building, industrial estate or shared facility, energy consumption may need to be separated between different users.

Meters can be installed on feeders supplying:

• Individual tenants
• Workshops
• Laboratories
• Business units
• Retail outlets
• Production departments
• Shared mechanical services
• Common areas

The accumulated energy data can support internal reporting and cost allocation.

However, internal energy monitoring should not automatically be described as revenue billing. Projects involving the commercial sale of electricity may be subject to additional metering, regulatory and contractual requirements. Final suitability must be assessed for the intended billing arrangement.

6. HVAC and mechanical-services monitoring

Heating, ventilation and air-conditioning systems can represent a major portion of a commercial building’s electricity use.

Energy meters can be installed on:

• Chillers
• Cooling towers
• Air-handling units
• Packaged air conditioners
• Ventilation fans
• Electric heating systems
• Mechanical-services boards

Monitoring allows facility managers to compare electrical use against:

• Operating hours
• Building occupancy
• Indoor and outdoor temperatures
• Cooling or heating demand
• Maintenance activity
• Seasonal changes

For example, an increase in chiller energy consumption without a corresponding increase in cooling demand may indicate fouled heat exchangers, poor control settings or equipment requiring inspection.

Energy measurements do not replace temperature, pressure or flow instrumentation. They provide an additional operating layer that can be used alongside those measurements.

7. Compressed-air systems

Compressed air is widely used in manufacturing but can be expensive to generate and difficult to manage efficiently.

Three-phase energy meters can monitor:

• Main compressors
• Individual compressor units
• Refrigerated dryers
• Compressor-room cooling
• Auxiliary equipment

When electrical input is compared with air-flow and pressure measurements, operators can assess how efficiently the compressor system is producing usable compressed air.

The combined data can help reveal:

• Compressors operating unloaded
• Excessive after-hours running
• Poor compressor sequencing
• Increased energy use for the same air output
• Potential leakage-related demand

An ADL400N or ADL400M would normally be used for three-phase industrial compressor installations.

8. Refrigeration and cold-storage systems

Cold rooms, food-processing facilities, warehouses and supermarkets often operate refrigeration systems continuously.

Energy meters can monitor:

• Compressors
• Condensers
• Evaporators
• Refrigeration distribution boards
• Individual cold-room systems

When combined with temperature, pressure and door-position data, energy measurements can help identify unusual compressor cycling, increased cooling demand or changes in system performance.

The purpose is not merely to report kWh. It is to understand how much energy the refrigeration system requires to maintain the desired conditions.

9. Solar PV and grid import/export monitoring

The ADL200N/ADL200M and ADL400N/ADL400M families support forward and reverse energy measurement. This makes them relevant to systems where power may flow in more than one direction.

Applications may include:

• Monitoring solar inverter output
• Measuring grid import and export
• Comparing PV generation with site consumption
• Monitoring energy transferred through an AC-coupled system
• Supporting energy-management strategies

For a single-phase solar installation, an ADL200N or ADL200M may be appropriate. Commercial three-phase solar systems would generally use an ADL400N or ADL400M.

The meter provides the electrical measurements. Any active control of solar generation or export requires a compatible inverter, energy-management system, PLC or controller.

10. Battery energy-storage systems

In AC-coupled battery installations, bidirectional metering can be used to measure the electrical energy associated with charging and discharging.

A meter installed at the battery inverter connection can help quantify:

• Energy used to charge the battery
• Energy delivered during discharge
• Interaction between the battery, building, solar system and grid
• Charge and discharge operating profiles

This information can help the system owner evaluate how the battery is being used rather than relying only on high-level inverter summaries.

11. EV charging infrastructure

EV charging can introduce significant new electrical loads into commercial buildings, apartment developments, warehouses and fleet facilities.

Energy meters may be installed on:

• Individual charger feeders
• Groups of chargers
• EV distribution boards
• Fleet-charging systems

The data may be used for:

• Energy reporting
• Internal allocation
• Charger-use comparison
• Peak-demand monitoring
• Integration into a building energy dashboard

Single-phase chargers may be monitored using an ADL200N or ADL200M. Three-phase chargers or grouped charging boards would generally use an ADL400N or ADL400M.

The energy meter does not replace the charger’s internal management or billing platform. It provides an independent electrical measurement point that can be integrated with the wider facility.

12. Generator and backup-power monitoring

Three-phase meters can also be used on generator outputs, automatic transfer systems and emergency distribution boards.

Useful measurements include:

• Voltage
• Current
• Frequency
• Active power
• Power factor
• Energy supplied during testing or outages

This helps facility managers confirm generator loading, compare routine test performance and record the amount of energy delivered during backup operation.

13. Energy-baseline and efficiency projects

Before investing in energy-saving equipment, a business should establish how much energy the existing system uses.

Meters can be temporarily or permanently installed to establish a baseline before upgrades such as:

• Variable-speed drives
• High-efficiency motors
• Compressor-control improvements
• Pump replacements
• Lighting upgrades
• HVAC optimisation
• Control-system changes

After the upgrade, the same measurement point can be used to compare performance under similar operating conditions.

This provides stronger evidence of improvement than comparing utility bills alone, because facility-wide electricity consumption may be affected by weather, production levels and other unrelated changes.

From a meter to an energy-monitoring system

An RS485 meter becomes more valuable when it is integrated into a broader monitoring architecture.

A typical arrangement is:

Electrical circuit ? current transformer and energy meter ? RS485 Modbus network ? PLC, HMI or industrial gateway ? local dashboard or cloud platform

RS485 allows multiple meters to share a communications network, subject to correct addressing, cable design, termination and system architecture.

The meters may be connected to:

• PLC-based control systems
• Touchscreen HMIs
• Building management systems
• SCADA platforms
• Industrial IoT gateways
• Local data loggers
• Cloud-based monitoring platforms

This allows electrical data to be displayed alongside process information such as flow, pressure, temperature, equipment status, alarms and production output.

The objective is not simply to collect more data. It is to present the right information in a form that supports maintenance, operations and management decisions.

Selecting between single-phase and three-phase models

ADL200N/ADL200M single-phase RS485 energy meters

These models are intended for appropriate single-phase applications such as:

• Small pumps
• Lighting circuits
• Single-phase machinery
• Individual office or retail circuits
• Small tenancies
• Single-phase solar systems
• Selected EV charging circuits

ADL400N/ADL400M three-phase RS485 energy meters

These models are suited to applications such as:

• Industrial motors
• Production machinery
• Compressors
• Chillers
• Main and sub-distribution boards
• Large pumps
• Three-phase solar systems
• Commercial EV charging
• Generator outputs

External-current-transformer versions are available in multiple configurations listed in the RCM documentation. Final selection must consider conductor dimensions, circuit current, the number of circuits being monitored, available panel space and the exact meter and CT ordering code.

Important limitations

RS485 energy meters provide valuable electrical information, but they should be applied within their proper role.

They do not replace:

• Circuit breakers or RCBOs
• Motor-protection relays
• Power-quality analysers where detailed harmonic analysis is required
• Vibration or temperature condition-monitoring systems
• Flow, pressure or process sensors
• Certified revenue-billing arrangements unless specifically approved for that use
• A controller required to act on the measured information

They are measurement and communications devices that provide the electrical data needed by a wider monitoring, reporting or control system.

Turning energy data into operational insight

The most useful energy-monitoring projects begin with an operational question rather than a product specification.

Examples include:

• Why is this pump using more power than before?
• Which production line consumes the most energy?
• How much electricity is used by HVAC compared with other building services?
• Is machinery operating outside production hours?
• How much energy is being imported, exported or supplied by solar?
• Has an efficiency upgrade delivered the expected result?

The ADL200N/ADL200M single-phase RS485 energy meters and ADL400N/ADL400M three-phase RS485 energy meters provide the measurement layer required to answer these questions.

When properly selected and integrated, they allow energy consumption to be monitored at the point where it matters: the individual machine, pump, process, tenancy, distribution board or energy system. This creates a practical foundation for better visibility, maintenance planning, energy management and automation.