Description
Meta Description
Technical specifications, control voltages, and lifecycle inventory advice for the GE Multilin PQMII-T20-C-A (PQMIIT20CA) power quality meter. Avoid substation stock-outs.
Core Specifications
By surface-mounting this dedicated monitoring instrument into a switchgear panel door, you establish an intelligent true RMS node capable of continuous 0.2% accuracy data capture across a three-phase power distribution network.
| Parameter | Value |
| Brand & Model | GE Multilin PQMII-T20-C-A (PQMIIT20CA) |
| Control Power Inputs | Low Voltage Option: 20 to 60 V DC / 20 to 48 V AC (50/60 Hz) |
| Power Consumption | Maximum 20 VA |
| Integrated Interfaces | 2 x Rear RS485 Ports (Modbus RTU), 1 x Front RS232 Port |
| Fixed Analog Inputs | 1 x 4 to 20 mA input loop |
| Expansion I/O Profile | 4 x Isolated Analog Outputs (0–20 mA or 4–20 mA), 4 x Relay Outputs, 4 x Switch Inputs |
| Signal Analysis Depth | Waveform Capture & Harmonic Analysis Functionality |
| Structural Weight | 3.28 lbs (1.49 kg) net |
| Condition Class | New Surplus (Original Box) / Refurbished (Bench Tested) |
Field Deployment Analysis
During routine panel migrations or cold commissioning phases, data packet losses across the Modbus network can occur if termination resistors are missing from the RS485 daisy-chain line. Field experience with the PQMII series shows that improper ground reference connection on terminal 19 often injects high-frequency frame noise directly into the internal 4 to 20 mA analog converter channels. Secure your shield drain connection straight to the panel’s low-impedance ground bus.
For distribution feeders operating under heavily distorted non-linear loads, monitoring the K-factor and total harmonic distortion (THD) profile is essential. If your plant relies on the internal 36-cycle trace memory logging feature, optimize your trigger setpoints to ensure transient sags do not continuously saturate the onboard flash registers.
Strengths and Operational Limits
- Pro: Independent hardware construction provides complete monitoring and local control functions separate from the main protection relays.
- Pro: Triple communication port layout enables simultaneous local interrogation and remote SCADA monitoring.
- Con: The low-voltage power supply variant chosen here is entirely incompatible with standard 120/240 V AC control busses.
- Con: Legacy computing bus limits native industrial Ethernet connection unless paired with an external MultiNet serial-to-Ethernet interface bridge.
Recommended Alternatives
If procurement bottlenecks delay your repair scheduling, check the specifications for the high-voltage power option (PQMII-T20-A-A), though note that this choice forces a layout change for your panel’s control voltage bus wiring. Avoid trying to use lower-tier base PQM variants if your control loop requires the 4-channel analog expansion block output features.
Spares Procurement Advice
For processing sites executing power control across more than eight substation feeders, keeping at least one PQMII-T20-C-A on hand as a buffer stock asset is critical to maintaining runtime efficiency. Because this legacy platform is subject to secondary market scarcity, depending on emergency vendor response during a plant blowout presents real operational risk. Make sure that your purchase orders require comprehensive component configuration logs to confirm the functionality of all internal mechanical output relays.
FAQ
- Can this specific meter operate directly off 125 V DC battery banks?No. The PQMII-T20-C-A variant is built specifically for 20 to 60 V DC power systems. Applying higher voltages will blow the input transformer fuse.
- How are firmware upgrades deployed to this unit?The meter uses a flash-upgradeable microchip architecture that handles updates via the front-facing RS232 port using EnerVista software.
- Does this unit include the transparent protective front panel cover?Check with your supplier. The waterproof clear door cover is an optional physical accessory code and is generally sold separately from the base meter block.
