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.
Frequently Asked
PM1, FAQ
Common questions about the PM1 single-phase power monitor.
How is the PM1 different from the PM3?
Same metering platform and 0.1% accuracy, but for single-phase circuits up to 277 VAC rather than three-phase 480 VAC.
How accurate is it?
0.1% across a 4000:1 dynamic range, IEC 62053-22 Class 0.2 equivalent, revenue-grade.
Can it control a load?
Yes, an external contactor up to 600 VAC / 1.2 A, with on-board RTC scheduling for time-of-use and demand management.
What are the connectivity and mounting options?
Wi-Fi, Modbus TCP/IP, cellular, or a hybrid PLC + RF mesh; 35 mm DIN-rail mount.
Ready to monitor your circuits?
Get pricing for single units, volume orders, and OEM integration into your energy management system.