Tech OVN

Portable Energy Logger — Built for Energy Auditors

Class 0.5S 3-phase energy logger that deploys in under 5 minutes via split-core CTs. Cloud-connected so audit data streams during the survey. The logger BEE-empanelled auditors, ESCOs, and global energy consultants ship to client sites.

Class 0.5S (IEC 62053-22)Accuracy10A – 1000ACTs< 5 minutesDeployWiFi + Ethernet + RS485Comms
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Tech OVN Titan Audit — portable 3-phase energy logger for energy auditors
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The Logger Energy Auditors Actually Take to Site

Energy audits live or die on the quality of measurement. Most portable loggers in the auditor price band ship Class 1.0 accuracy — fine for trend visualisation, fatal for ISO 50001 baselines, ESCO performance contracts, and BEE-grade M&V. The Tech OVN portable energy logger ships Class 0.5S as standard, manufactured on the same production line as our utility-grade smart meters.

We don't do energy audits. We make the hardware audit firms ship to client sites — and we sell to BEE-empanelled auditors across India, plus ESCOs and energy consultants across the Middle East, Southeast Asia, Europe, and Africa. Cloud-connected logging means data streams during the survey; auditors can show findings on a tablet before leaving the site.

What the Logger Does

The capabilities that matter when the deliverable is an audit report — not a dashboard demo.

Deploy in Under 5 Minutes

Split-core CTs clamp around existing cables — no shutdown, no electrician, no permanent install. Auditors are taking readings within minutes of arrival.

Class 0.5S Accuracy

Utility-grade revenue accuracy (IEC 62053-22 Class 0.5S). Audit reports backed by Class 0.5S data hold up under M&V scrutiny — Class 1.0 portable loggers don&apos;t.

Load Profile & Demand

Configurable 1-second to 60-minute interval logging on-device, with running demand calculation (15-min and 30-min windows). Captures the load-profile and peak-demand data that BEE PAT and ESCO M&V deliverables require.

Cloud-Connected Out of the Box

Built-in WiFi, Ethernet, and RS485 (Modbus RTU/TCP). Audit data streams to the cloud during the survey — auditors review on a tablet at the site, generate reports before leaving.

Long-Duration Logging

On-device storage for multi-day surveys without cellular dependency. Configurable logging intervals down to 1 second for transient events.

Auditor-Friendly Reports

Built-in M&V report templates — energy consumption, demand profile, power factor, ECM baselines. Export to PDF / Excel / CSV.

How to Choose a Portable Energy Logger for an Indian Site Audit

  1. Accuracy class. Class 0.5S is the auditor-grade benchmark for energy consumption measurement — tighter than the Class 1.0 portable loggers commonly found at the budget end. For ISO 50001 baselines, IPMVP-aligned ESCO contracts, or BEE PAT submissions, specify Class 0.5S.
  2. Channel count and CT range. A 3-phase 4-wire logger covers most industrial loads. CT range matters — a logger supplied with 100A CTs but needing 600A or 1000A CTs on a transformer secondary means an extra purchase plus delay. Confirm CT range matches the load profile of your typical client.
  3. Logging interval and on-device storage. Most audits run 1-day, 1-week, or 1-month surveys. Configurable logging intervals (1 sec to 60 min) and on-device storage that covers your typical survey duration matter more than fancy software.
  4. Connectivity to the data platform. Cloud-connected loggers (WiFi to a phone hotspot or site WiFi; Ethernet at fixed sites; RS485 to existing BMS / SCADA) stream data during the survey. Auditors review on-site and generate reports before leaving. SD-card-only loggers slow client delivery by days.
  5. Calibration certificate. NABL-traceable is the Indian baseline; ILAC-MRA recognition is the international equivalent. The cert format matters — some clients (DISCOMs, BEE assessors, ISO 50001 auditors) require specific traceability chains.
  6. Warranty and local support. Cross-border RMA on imported loggers typically takes 4-8 weeks. Indian-built loggers can ship a replacement in days. Multi-unit audit firms care more about this than first-time buyers.
  7. Report format. Built-in PDF / Excel / IPMVP-compatible templates save 4-8 hours per audit. Ask any prospective supplier for a sample audit report before committing.

Note on power quality: If the audit also requires power quality investigation (harmonics, sags, flicker), specify a separate IEC 61000-4-30-compliant device alongside the energy logger — most audit firms use two devices for the two jobs.

Who Ships Tech OVN Loggers to Site

Our buyer is the consultant, ESCO, or in-house engineer running the audit — not the building owner.

BEE-Empanelled Energy Auditors

Independent energy auditors and energy audit firms running BEE-empanelled energy audits across India. Class 0.5S compliance is essential for EnMS / ISO 50001 audit deliverables.

ESCOs (Energy Service Companies)

ESCOs running performance contracts need pre- and post-installation M&V data. Portable loggers let one ESCO instrument multiple sites without permanent capex.

MEP & HVAC Consultants

Mechanical, electrical, plumbing and HVAC consultants verifying loads, sizing transformers, troubleshooting power factor, and validating commissioning.

Global Energy Consultants

International energy efficiency consultants operating across regions. Cloud-connected logging means client data is accessible without flying back to home office.

Industrial Plant Engineers

Plant engineering teams running internal energy audits, troubleshooting power quality issues, or validating utility bills against actual consumption.

Universities & Research Labs

Building science, energy research, and engineering programmes that need accurate, high-resolution electrical data for studies and student projects.

Logger Specifications

ParameterSpecification
Channels3-phase 4-wire (1Φ + 3Φ configurable)
Voltage RangeDirect connect 110-480 V (line-to-line); higher via PT
Current RangeSplit-core CTs — 10A to 1000A
Energy AccuracyClass 0.5S (IEC 62053-22)
MeasurementsV, I, active / reactive / apparent power & energy (kWh, kvarh, kVAh), demand, power factor, frequency, load profile
Logging Interval1 sec to 60 min (user-configurable)
On-Device StorageMulti-day survey capacity at typical intervals
ConnectivityWiFi + Ethernet + RS485 (Modbus RTU/TCP)
Cloud PlatformReal-time streaming + offline sync to Tech OVN Energy Intelligence Platform
OutputPDF / Excel / CSV reports; raw data via API
PowerMains-powered with battery backup for transients
EnclosurePortable, IP rated for site use

Why Auditors Choose Tech OVN

Four reasons the same loggers keep showing up in auditor toolkits across India and overseas.

Class 0.5S, Not Class 1.0

Most portable loggers in this price band are Class 1.0 — fine for trend visualisation, but not for revenue-grade M&V or ISO 50001 baseline-setting. Tech OVN ships Class 0.5S as standard, manufactured on the same line as our utility-grade smart meters.

Cloud-Connected by Default

Auditors no longer have to drive back, copy SD cards, and manually merge files. Data streams during the survey; reports can be generated and shared from the site.

Built by an Energy-Meter Manufacturer

Tech OVN is the energy metering arm of OVN Engineers, in the power and water industry since 1949. The portable logger uses the same metering core as our DIN-rail meters, packaged for portability — not a third-party board in a branded enclosure.

Made in India, Shipped Worldwide

Manufactured at our 7.5-acre Delhi NCR facility and shipped to energy consultants across the Middle East, Southeast Asia, Europe, and Africa. Lower TCO than comparable European loggers.

Portable Energy Loggers Used in India Today

Customers evaluating portable 3-phase energy loggers — also referenced as 3 phase data loggers, portable energy audit kits, energy audit instruments, or load survey loggers — in India typically shortlist Tech OVN's Titan Audit alongside Fluke 1735, Fluke 1738, Hioki PW3360, Megger MTM3550, and EMBUILT EVL-3. Each device captures the energy consumption parameters that BEE PAT, ASHRAE Level audits, ISO 50001 baselines, and ESCO M&V workflows require — kWh, demand, power factor, voltage, and current.

Buyers in this category typically weigh a short list of decision factors: accuracy class (Class 0.5S vs Class 1.0), 3-phase channel count, split-core CT range to fit varied load sizes, logging interval and on-device storage capacity, connectivity to the data platform, calibration certificate format, and warranty plus local support in the country where the logger is being used.

Tech OVN's Titan Audit ships Class 0.5S active-energy accuracy on the same metering core as our DIN-rail utility meters, supports split-core CTs from 10A to 1000A, and streams data over WiFi, Ethernet, or RS485 to the Energy Intelligence Platform. Built in India and supplied to ESCOs and audit firms across India, the Middle East, Southeast Asia, Europe, and Africa.

From Site Survey to Permanent Programme

When clients move from one-off audits to continuous energy programmes, the same Titan platform supports permanent meters and a multi-site dashboard. Auditors can offer clients a longer-term measurement service without changing tools.

Titan Audit — Portable Logger Detail →Permanent Energy Monitoring System (Multi-Site) →Titan PQ — Continuous Power Quality Monitor →Titan Audit vs Other Portable Loggers — Comparison →

Frequently Asked Questions

Common questions about accuracy, ISO 50001 / IPMVP compatibility, CTs, and international supply.

A portable energy logger — also called a portable power logger, a 3 phase energy data logger, a portable energy audit kit, an energy audit instrument, a load survey logger, or a temporary submeter — is a battery-backed measurement device that auditors and consultants clamp onto live electrical circuits using non-invasive split-core CTs. It records voltage, current, power, and energy data over hours, days, or weeks without disrupting operations or requiring a permanent install. Titan Audit is sold under all of these category names depending on the buyer&apos;s reference point.
Audit deliverables — ISO 50001 baselines, ESCO performance contracts, BEE energy audit reports, ECM (energy conservation measure) verification — all rely on the measurement accuracy of the logging device. Class 0.5S (the same class utilities use for revenue billing) means your client can&apos;t challenge the numbers. Class 1.0 or 2.0 loggers introduce ±1-2% error that can wipe out claimed savings on small ECMs.
Yes for 3-phase 4-wire and single-phase. The logger is configured at the site for whichever topology is being measured. DC measurement requires a different sensor type — contact us for DC-specific applications.
Split-core CTs in standard ranges from 10A to 1000A. Choice depends on the load being measured. Custom-range CTs are available for specialised applications.
Yes. We ship to consultants and ESCOs across the Middle East, Southeast Asia, Europe, and Africa. International orders include cloud platform access in the auditor&apos;s region, multi-currency tariff support, and regional-language report templates on request.
A permanent submeter (like our DIN-rail Titan) is wired in for continuous monitoring — best for long-term programmes. A portable logger is for surveys, audits, troubleshooting, and short-term M&V — clamped on for hours to weeks, then removed. Most energy audit firms use both: portable loggers for client engagements, and permanent meters for clients on long-term efficiency programmes.
Yes. The platform exports M&V-compliant data to PDF, Excel, CSV, and via API — formatted for ISO 50001, IPMVP (International Performance Measurement and Verification Protocol), and BEE EnMS frameworks. We supply the same logger to most BEE-empanelled energy auditors in India.
Standard warranty plus optional extended warranty and on-call calibration / firmware support. Calibration certificates are issued from our in-house calibration lab, traceable to NABL standards.
Both — the category names overlap. Indian energy auditors typically search for a portable energy audit kit or an energy audit instrument when sourcing equipment; international consultants more often use 3 phase data logger or three phase energy data logger; field engineers say power logger or energy logger. Titan Audit is built to serve all of these use cases: a portable 3 phase 4-wire energy data logger with split-core CTs from 10A to 1000A, Class 0.5S accuracy, on-device storage, and live cloud streaming. The same kit covers ECM baselining, ESCO M&V surveys, BEE PAT data collection, ISO 50001 readiness, and load studies — without needing a separate device per workflow.
Customers evaluating portable energy loggers in India typically look at Tech OVN&apos;s Titan Audit, Fluke 1738, Hioki PW3360, Megger MTM3550, and EMBUILT EVL-3. Titan Audit targets the same auditor-facing use cases — BEE PAT prep, ISO 50001 baselining, ESCO M&V, ASHRAE Level audits — with Class 0.5S active-energy accuracy and cloud-connected data streaming through the Energy Intelligence Platform.
No — Titan Audit captures energy consumption parameters (V, I, P, kWh, kvarh, demand, power factor) at Class 0.5S accuracy. For power quality investigations (harmonics, voltage sags / swells, flicker, transients) Tech OVN supplies the Titan PQ — a separate device built to IEC 61000-4-30 measurement methods. Audit firms typically use both: Titan Audit for the energy survey, Titan PQ for any PQ deep-dive on the same site.
An energy logger captures energy consumption parameters — kWh, kvarh, demand, power factor, V, I — typically at Class 0.5S or Class 1.0 accuracy. A power quality analyser focuses on disturbances — voltage events, harmonics, flicker, transients — using IEC 61000-4-30 methods. Some devices in this category combine both (Hioki PW3360 and Fluke 1738 are examples); Tech OVN supplies two separate purpose-built devices — Titan Audit for energy audits and Titan PQ for power quality surveys.

Trademark Notice

Tech OVN's Titan Audit is the product described on this page. Other portable energy logger products mentioned for category context — Fluke 1735, Fluke 1738, Hioki PW3360, Megger MTM3550, and EMBUILT EVL-3 — are trademarks or registered trademarks of their respective owners: Fluke Corporation; Hioki E.E. Corporation; Megger Limited; and EMBUILT Technologies. Tech OVN is not affiliated with, endorsed by, or sponsored by any of these manufacturers.

Class 0.5S audit-grade logging, cloud-connected

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