Description

The GE PQMII-T20-C-A is a high-accuracy, multi-function power quality and energy meter designed for continuous monitoring of electrical distribution systems in demanding industrial, commercial, and utility environments. As part of GE’s (now part of Emerson) renowned Power Quality Meter II (PQMII) series, the PQMII-T20-C-A combines revenue-grade energy metering with advanced power quality diagnostics compliant with IEC 61000-4-30 Class A—the highest international standard for measurement accuracy and repeatability. This model features 20 current inputs, supporting up to 6 three-phase circuits (plus neutral), making it ideal for switchgear panels, motor control centers, or substation feeders requiring comprehensive multi-point monitoring.

Equipped with high-speed sampling (up to 256 samples/cycle) and deep onboard memory, the GE PQMII-T20-C-A captures fast transients, voltage sags/swells, harmonic distortions (up to 63rd order), interharmonics, flicker, and unbalance with microsecond-level time-stamping. All data is stored locally and can be accessed via built-in 10/100 Mbps Ethernet using standard protocols like Modbus TCP, DNP3, or IEC 61850 (optional), enabling seamless integration into SCADA, EMS, or building management systems. The device also includes an embedded web server for remote configuration and real-time waveform viewing without proprietary software. With its rugged DIN-rail design and wide operating temperature range, the PQMII-T20-C-A delivers laboratory-grade performance in harsh field conditions.

Technical Specifications

Main Features and Advantages

IEC 61000-4-30 Class A certified precision:
Unlike lower-tier meters, the PQMII-T20-C-A meets the stringent requirements of Class A as defined in IEC 61000-4-30 Ed. 3, ensuring legally defensible data for utility disputes, compliance audits (e.g., IEEE 519), or forensic analysis after equipment failure. Every voltage and current channel is independently calibrated and synchronized across all 20 inputs, eliminating timing skew between circuits.

Multi-circuit monitoring in a single compact unit:
With 20 current inputs, the PQMII-T20-C-A eliminates the need for multiple meters in complex panels. It can simultaneously monitor main incomers, critical feeders, and sensitive loads—providing correlated event analysis to pinpoint whether a voltage dip originated upstream or was caused by a local motor start.

Advanced transient and waveform capture:
The PQMII-T20-C-A records full-cycle waveforms during disturbances with 1 µs resolution, capturing not just RMS deviations but actual waveform distortion. This enables root-cause analysis of nuisance tripping, capacitor bank failures, or variable frequency drive (VFD) malfunctions that standard meters miss.

Seamless IT/OT integration:
Built-in web server, FTP auto-export, and support for PQDIF (IEEE 1159.3) and COMTRADE formats allow automated data delivery to cloud platforms or enterprise analytics tools. Engineers can access real-time phasor diagrams or harmonic spectra from any browser—no client software required.

Long-term reliability with minimal maintenance:
Designed for 15+ years of continuous operation, the PQMII-T20-C-A uses solid-state components with no moving parts. Its wide power input range tolerates brownouts, and conformal coating protects against humidity and dust in industrial enclosures.

Application Field

The GE PQMII-T20-C-A is deployed wherever power reliability directly impacts safety, productivity, or regulatory compliance. In data centers, it monitors dual-fed UPS inputs and PDU branches to validate uptime SLAs and detect harmonic resonance from server PSUs. Within semiconductor fabs, the PQMII-T20-C-A ensures clean power for lithography tools by continuously verifying voltage THD<3>

In utility substations, the PQMII-T20-C-A serves as a Class A reference meter for grid code compliance, logging flicker from arc furnaces or voltage unbalance from single-phase renewables. Hospitals use it on life-support and imaging circuits to meet NFPA 99 requirements for power continuity. Even in mining and metals processing, where large cyclical loads cause voltage fluctuations, the PQMII-T20-C-A provides actionable data to optimize load scheduling or size dynamic VAR compensators. Across all these sectors, the PQMII-T20-C-A transforms raw electrical data into operational intelligence—preventing downtime before it occurs.

Related Products

• PQMII-T04-C-A: 4-current-input variant for simpler applications

• PQMII-T12-C-A: 12-current-input model, mid-range capacity

• Multilin™ PQM: Successor platform under Emerson with enhanced cybersecurity

• GE EPM7000: Lower-cost energy meter without Class A power quality

• SEL-735: Competitor power meter from Schweitzer Engineering Laboratories

• PQSCADA Software: Legacy GE tool for centralized PQ data aggregation

• Rogowski Coils (e.g., CR4500): Flexible CTs compatible with PQMII-T20-C-A

• Emerson PACSystems™ RSTi-EP: PLC platform often integrated with PQMII for automated responses

Installation and Maintenance

Pre-installation preparation: Before installing the GE PQMII-T20-C-A, verify CT polarity and ratio settings match the system configuration. Ensure voltage wiring adheres to CAT III 600V safety standards, and use shielded twisted-pair cables for analog inputs to minimize noise. Confirm the Ethernet network supports DHCP or assign a static IP within the plant’s OT subnet. Mount the unit on a grounded DIN rail with at least 50 mm clearance above/below for heat dissipation. Perform a loop test with known loads to validate current channel scaling.

Maintenance recommendations: Schedule quarterly reviews of the PQMII-T20-C-A’s event log and harmonic trends via its web interface. Replace the internal backup battery every 5 years to preserve clock and configuration during power loss. Annually validate calibration against a portable Class A analyzer if used for billing or compliance. Keep firmware updated to benefit from protocol enhancements and security patches. If the SD card reaches 80% capacity, configure automatic FTP offload or archive data to prevent overwrite of critical events. Always back up the device configuration (.xml) before any network changes.