Power Quality Measurement
PM1
Single-Phase Energy Monitoring & Load Control
Revenue-grade 277VAC single-phase energy metering and scheduled load control — with flexible Wi-Fi, cellular, Modbus, or power line communications.
ARG Instruments
Precision single-phase energy monitoring.
The PM1 measures active, reactive, and apparent power, RMS current and voltage, power factor, line frequency, and cumulative energy on any single-phase 277VAC circuit — with 0.1% accuracy across a 4000:1 dynamic range. Add contactor control and you have a complete single-phase energy management node.
Built for Industry
Everything a single-phase monitoring node needs.
From the meter to the cloud — measurement, control, communications, and security in one DIN rail module.
Revenue-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
| Voltage Input | 80–277VAC, single-phase (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 CT) 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 circuit to the cloud.
The PM1 connects single-phase energy data to wherever you need it — cloud dashboards, SCADA systems, or local BMS.
Sub-Metering & Cost Allocation
Monitor individual circuits, machines, or tenant spaces. Granular energy visibility at the circuit level, with interval data logging and cost allocation by load.
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.
Remote & Distributed Sites
Deploy in locations without network infrastructure using cellular or PLC mesh. LTE-M for remote sites, PLC mesh with no new wiring, cloud or on-premises dashboard.
Building Energy Management
Integrate PM1 into building management systems via Modbus TCP/IP or Wi-Fi. Real-time circuit visibility, automated reporting, and load scheduling in commercial buildings.
Ready to monitor your circuits?
Get pricing for single units, volume orders, and OEM integration into your energy management system.