Overview
The Electrocorder EC-7VAR-RS is a portable three-phase voltage, current, power factor and energy logger for industrial electrical analysis, fault finding, load surveys and energy audits.
Use it when you need to understand how a three-phase electrical system behaves over time, rather than relying on spot readings. The EC-7VAR-RS records phase voltages and phase currents using three flexible Rogowski coils and four voltage leads for L1, L2, L3 and neutral, then provides the data needed to analyse kW, kVAR, kVA, peak demand, power factor, and highest and lowest voltage and current values with dates and times.
Best for:
- Three-phase load surveys, feeder loading checks and energy audits.
- Investigating voltage, current and power factor behaviour on industrial or commercial sites.
- Checking whether low voltage is related to high current demand on site.
- UPS sizing, standby generator sizing and temporary power studies.
- Evidence-based fault finding where a short site visit or spot measurement is not enough.
Consider another model if:
- Simple single-phase appliance monitoring, where the AL-2VA or EC-2VA may be a better fit.
- Voltage-only investigations, where a three-phase voltage recorder such as the EC-3V may be sufficient.
- Current-only studies, where a CT-3A-RS or EC-3A-RS current logger may be simpler.
What you get:
- EC-7VAR-RS logger in the smaller 190 x 120 x 60 mm enclosure.
- Three flexible Rogowski current sensors, suitable for fitting around conductors up to 140 mm diameter.
- Four fused voltage leads for L1, L2, L3 and neutral.
- USB download lead, carry case, batteries, user instructions and free Electrosoft analysis software.
The logger is designed to be installed by a competent person, generally an electrician or engineer. It is usually fitted at a distribution board or access panel by placing the Rogowski coils around the conductors and connecting the voltage leads to the measurement point. If suitable isolated test points are available, it can often be fitted without interrupting the supply.
After setup in Electrosoft, press the start button to begin recording and select the current range. The indicator flashes green while recording and red when the logging run has finished. When enough data has been captured, disconnect the logger, connect it to a PC by USB and use Electrosoft to view, save, export and report on the results.
Applications
Typical applications: fault finding, phase unbalance testing, power quality monitoring, load surveys, energy audits and current consumption investigations.
What the EC-7VAR-RS records and calculates:
- Three-phase voltage and three-phase current.
- Power factor on L1/A1.
- Real power, reactive power and apparent power, shown as kW, kVAR and kVA.
- Peak demand, highest and lowest currents, highest and lowest voltages, and power factor with date and time information.
- TRMS average, minimum and maximum values across the selected averaging period.
Why constant sampling matters: many instruments only take periodic snapshots. The Electrocorder continuously samples throughout the averaging period, helping capture short events, changing loads and trend data that can otherwise be missed.
Recording duration depends on the selected averaging period. The logger can record for up to 50 days using the EN50160 10-minute constant averaging period, or from 2 seconds for short detailed studies through to 60 minutes for long-term monitoring.
The EC-7VAR-RS is built into a rugged 190 x 120 x 60 mm enclosure and supplied with a protective carry case, flexible Rogowski coils and fused voltage leads with crocodile clips. It can operate on replaceable batteries for up to one week of volt-free logging where needed, with unlimited logging time while the voltage connection is live.
Electrocorder loggers are used by utilities, industry, facilities teams, electrical contractors and maintenance engineers. Existing customers include SSE, ESB, NIE and Dalkia.
Related application guides:
- Energy Audit Loggers: for energy audits, load profiles, peak demand and before/after savings evidence.
- Voltage Problem Loggers: for high voltage, low voltage, voltage variation, dips and interruptions.
- Machine Trip and Reset Loggers: for equipment trips, resets, lockouts and intermittent electrical faults.
- Load Survey and Current Loggers: for feeder checks, current logging, load surveys and capacity planning.
- Power Factor and Three Phase Power Loggers: for kW, kVA, kVAR, power factor, peak demand and three-phase power analysis.
Case Studies
These related Electrocorder case studies and application pages show how three-phase logging, energy auditing, voltage monitoring and power quality investigation are used in real sites.
Thermoservice, Bulgaria - Energy Audit
Thermoservice used Electrocorder electrical data loggers, including the EC-7VAR-RS, to support customer energy-efficiency audits and interpret recorded energy data.
Machines Tripping or Resetting
A power-quality investigation page covering voltage waveform purity, voltage variation and site-related electrical issues, with the EC-7VAR-RS listed as a key product.
Saving Energy in Industry
An industrial energy-saving application page focused on measurement, ongoing data logging and identifying where energy reductions may be possible. The EC-7VAR-RS is listed as a key product.
HEP ODS, Croatia - Voltage Logging
A distribution-network example showing how Electrocorder voltage logging equipment is used to diagnose supply voltage issues. The EC-7VAR / EC-7VAR-RS model family is listed among the products used.
Resources
Documentation:
Download the EC-7VAR-RS datasheet and user instructions for detailed technical information, installation guidance and operating instructions.
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Datasheet |
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User Instructions (English) |
Free Electrosoft PC software
Electrosoft is compatible with Windows 11 down to Windows 7. It lets you view and zoom current, power and energy graphs, export data to Microsoft Excel, email results to colleagues, and print or save reports as PDF files with your company logo.
Electrosoft includes statistics, load balancing, tariff and costing analysis, annual CO2 and energy usage projections, logger management and calibration management tools. Sample files are included so you can try the software without having a logger connected.
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Download Electrosoft PC software |
Features
When to choose the EC-7VAR-RS
Choose this model when you need voltage, current, power and power factor together on a three-phase system. It is especially useful when the investigation depends on seeing the relationship between site load, voltage variation and energy demand over time.
Compare with simpler Electrocorder models
If you only need single-phase appliance or small-load monitoring, start with the AL-2VA or EC-2VA. If the investigation is only about three-phase voltage, the EC-3V may be sufficient. If you only need three-phase current logging, consider the CT-3A-RS or EC-3A-RS. Use the EC-7VAR-RS when you need the fuller picture: voltage, current, power, energy and power factor in one logging run.
Key features:
- Three-phase voltage and current logging with power factor, kW, kVA and kVAR analysis.
- Flexible Rogowski coils for practical fitting around large conductors.
- Constant sampling to reduce the risk of missing short-duration or changing load events.
- Configurable averaging period from 2 seconds to 60 minutes.
- Rugged enclosure with IP43 or IP65 environmental sealing options.
- Tamper-resistant setup: once configured on a PC, site personnel cannot alter logging parameters from the logger.
- Suitable for energy audits, load surveys, feeder loading checks, UPS sizing, generator sizing and fault diagnosis.
Power factor measurement
Power factor, also known as PF or Cos f, is recorded for voltage channel L1 and current channel A1. Electrosoft uses this to calculate real, reactive and apparent power for all three phases. Power factor data can help identify whether power factor correction may be needed. For accurate PF measurement, the logger needs a current or voltage reading of around 20% of scale.
Included with your energy data logger:
- Electrocorder EC-7VAR-RS logger.
- Three flexible Rogowski coils.
- Four voltage leads.
- USB download cable.
- Carrying case.
- User instructions.
- Free Electrosoft analysis software download.
Shipping and origin details:
- Harmonised Code: 9030.3901.00 (electronic datalogger).
- Origin: Northern Ireland, United Kingdom.
- Packaged dimensions: approximately 2.5 kg, 30 x 26 x 17 cm.
Determining product order codes:
To specify your Electrocorder select various codes and enter into the boxes in order to create an accurate product code. For example: EC-7VAR-RS-5H-IEC-IP43-SET.
FAQ
When should I choose the EC-7VAR-RS instead of a current-only logger?
Choose the EC-7VAR-RS when you need to measure voltage, current, power, energy and power factor together. A current-only logger can be a good fit for simpler load surveys, but the EC-7VAR-RS gives a fuller picture when voltage variation, power factor, energy demand or the relationship between voltage and current matters.
Does the EC-7VAR-RS measure all three phase voltages and currents?
Yes. The logger uses three flexible Rogowski current sensors and four voltage leads for L1, L2, L3 and neutral, allowing three-phase voltage and current recording.
What does Range Select mean?
Range Select means the logger supports dual measurement ranges rather than one fixed range. This helps the same model cover different site current levels more flexibly.
Can it help identify whether low voltage is caused by site load?
Yes. Because the EC-7VAR-RS records both voltage and current, it can help show whether low voltage events coincide with high current demand on the site, or whether the low voltage appears to be supplied to the site.
Does it record power factor?
Yes. Power factor is recorded for voltage channel L1 and current channel A1, then used by Electrosoft to calculate real, reactive and apparent power for all three phases.
How long can it record for?
Recording duration depends on the selected averaging period. The logger can record for up to 50 days using the EN50160 10-minute constant averaging period, with shorter averaging periods available for more detailed studies and longer periods available for extended monitoring.
Can it be fitted without interrupting the supply?
In many cases, yes, provided suitable isolated test points are available. It should be installed by a competent person, generally an electrician or engineer.
What software is used to analyse the data?
Electrosoft PC software is used to configure the logger, download the recorded data, view graphs, export data, and create analysis reports.
Which simpler model should I consider if I do not need full three-phase power analysis?
For single-phase appliance or small-load monitoring, consider the AL-2VA or EC-2VA. For three-phase voltage-only investigations, consider the EC-3V. For current-only studies, consider the CT-3A-RS or EC-3A-RS.