POWER QUALITY MEASUREMENT

PM3

3-Phase Energy Monitoring & Load Control

Industrial-grade 480VAC energy metering and scheduled load control for heavy industry — with flexible Wi-Fi, cellular, MODBUS, or power line communications.

ARG INSTRUMENTS

Precision energy monitoring. Any industrial load.

The PM3 measures active, reactive, and apparent power, RMS current and voltage, power factor, line frequency, and cumulative energy across up to three 480VAC phases — with 0.1% accuracy across a 4000:1 dynamic range. Add contactor control and you have a complete energy management node.

480VAC

3-phase industrial rated

0.1%

Metering accuracy

4

Comm options (plug-in)

DIN rail

35mm, panel-ready

BUILT FOR INDUSTRY

Everything a power monitoring node needs to be.

From the meter to the cloud — measurement, control, communications, and security in one DIN rail module.

⚡

Industrial-Grade Metering

0.1% accurate across a 4000:1 dynamic range. Active, reactive, and apparent power. RMS voltage and current. Power factor, line frequency, and cumulative energy.

📶

Flexible Communications

Wi-Fi 6 (2.4/5GHz), MODBUS TCP/IP, Cellular LTE-M with Onomondo eSIM, or Hybrid Power Line & RF mesh. One protocol selected at order — no network installer required.

⏱️

Scheduled Load Control

External contactor control up to 600VAC / 1.2A, independent of line voltage. Built-in RTC with 48-hour power backup. Non-volatile load schedule storage.

🔒

Enterprise Security

EAP-PSK with 256-bit ECC encryption, configured at the factory. TLS/SSL for all cloud and on-premises connections. Only whitelisted nodes can join the network.

SPECIFICATIONS

Technical Specifications

Technical Specifications
Voltage Input	80–480VAC, 1–3 phase (L-L or L-N), 50/60Hz
Metering Accuracy	0.1% across a 4000:1 dynamic range (IEC 62053-22 Class 0.2 equivalent)
Measured Parameters	Active, reactive & apparent power; RMS voltage & current; power factor; line frequency; cumulative energy
Current Input	External CT connection (1–3 CTs) via cage clamp terminals
Reporting Interval	1 second to 1 day (configurable); local storage when offline, auto-sync on reconnect
Load Control	External contactor: 80–600VAC coil, 1.2A max, independent of line voltage
Real-Time Clock	On-board RTC with 48-hour power backup; non-volatile schedule storage
Communication	Wi-Fi 6 (2.4/5GHz) — or — MODBUS TCP/IP — or — Cellular LTE-M/NB-IoT (Onomondo eSIM) — or — Hybrid PLC+RF (CENELEC-B)
Security	EAP-PSK, 256-bit ECC (factory-configured); TLS/SSL cloud & on-premises
Dimensions	2.66 × 2.95 × 4.21 in (68 × 75 × 107 mm)
Mounting	35mm DIN rail
Operating Temperature	-40°C to +85°C

APPLICATIONS

From the panel to the cloud.

The PM3 connects industrial energy data to wherever you need it — cloud dashboards, SCADA systems, or local BMS.

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Industrial Energy Management

Monitor and report energy consumption across multi-phase 480VAC industrial loads. Sub-metering by machine or circuit, energy cost allocation, trending and interval data logging.

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Demand Response & Load Control

Automate load shedding and scheduled switching without a separate PLC. Time-of-use scheduling, peak demand management, contactor control up to 600VAC.

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Remote & Distributed Sites

Deploy in locations without network infrastructure using cellular or PLC mesh. Cellular LTE-M for remote sites, PLC mesh with no new wiring, cloud or on-premises dashboard.

🏢

Building Energy Management

Integrate PM3 into building management systems via Modbus TCP/IP or Wi-Fi. Real-time power visibility, automated reporting, and load scheduling in commercial facilities.

PM3