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Guardian Meter Socket Power Quality Recorder
Guardian2023 Guardian with new wirecell-guardian-sticker-sidecell-guardian-port-side

Guardian Meter Socket Power Quality Recorder

$4,770.00 – $6,739.00Price range: $4,770.00 through $6,739.00

Please call +1 (800)296-4120 for International Pricing

200A · 2 Voltage + 2 Current Channels · Harmonics to the 51st · Up to 1 GB · Cell & Wi-Fi Optional

The PMI Guardian is a meter socket power quality recorder designed to simplify residential and light commercial power quality investigations. Installed directly at the meter, this weatherproof meter captures voltage, current, harmonics, and waveform data to provide a clear view of system performance.

Add optional built-in cellular communication, and remotely access data, receive real-time alerts, and monitor conditions without returning to the site. This eliminates unnecessary truck rolls, reduces labor costs, and improves response efficiency.

Paired with PQ Canvass cloud-based software, the Cell Guardian enables teams to analyze data, share insights, and troubleshoot issues from anywhere. The result is faster diagnostics, more efficient operations, and a smarter approach to managing power quality investigations. Add Merlin™, PMI’s AI-assisted data analysis tool to PQ Canvass and turn 5 hours of data review into 15 minutes!

Every Guardian is individually tested for accuracy and ships with a comprehensive calibration certificate.

Get Started Here


  • Clear

Have a PQ Question? Ask Merlin™ — Free

Send it to askmerlin@powermonitors.com or text (540) 383-3144

  • Features and Benefits
  • Specs
  • Software
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  • White Papers
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  • FAQ

Features and Benefits

The Guardian is purpose-built to reduce the time, cost, and complexity of residential power quality investigations. Installed directly into the meter socket, it captures data at the point of service, providing accurate insight into voltage conditions, current behavior, and system performance without requiring complex setup. Its weatherproof, all-weather enclosure is built to hold up outdoors for the long term. This streamlined installation allows utilities to deploy quickly across multiple locations and begin collecting actionable data immediately.

Optional integrated cellular communication enables remote access to data at any time, eliminating the need to revisit sites to retrieve data. Real-time text and email alerts notify users as soon as events occur, allowing teams to respond only when necessary. This targeted approach significantly reduces unnecessary truck rolls, improves crew efficiency, and lowers operational costs.

The Guardian delivers comprehensive power quality analysis, including voltage, current, power factor, phase angle, harmonics to the 51st order, and advanced waveform capture. It also supports CBEMA and ITIC curve analysis, helping users evaluate how disturbances impact sensitive equipment. By capturing long-term trends, the Guardian provides the complete data needed for accurate root cause analysis.

With PQ Canvass cloud-based software, users can access, analyze, and share data from any device. This improves collaboration, speeds up decision-making, and ensures power quality issues are resolved quickly and effectively.

Specs

Inputs
AC Voltage 0 to 150 V per channel
AC Current 200 Amps RMS
Sample Rate 256 samples/cycle/channel
Channels
Voltage 2 channels
Current 2 channels
Measured Quantities (Per Cycle)
RMS Voltage Volts
RMS Current Amps
Real Power Watts
Apparent Power VAs
Reactive Power VARs
Phase Angle Degrees
Power Factor Watts/VA
Displacement PF cos (phase angle)
Power Usage kWh, kVARh, kVAh
Accuracy
Voltage ±0.33% of full scale
Current ±1.0% of full scale
Power ±1.0% of full scale
Phase Angle  ±1.0°
Power Factor ±0.02
Displacement PF ±0.02
Power Fail Operation
Ride-Through Operates up to 1 minute without input voltage to send alerts during interruptions
Harmonics
Voltage To the 51st order
Current To the 51st order
Analysis Magnitude, phase, THD
Voltage Tolerance Curves CBEMA and ITIC curve analysis
Communications
Standard USB-A
USB Cable 6 ft., weatherproof twist-lock connector to USB-A. Not rated for use in high-voltage environments.
Optional Cell modem, WiFi, Bluetooth Low Energy (BLE)
Information Storage
Data Storage 16 MB (standard); 128 MB, 512 MB, or 1 GB (optional)
Significant Change 1,000 records
Flicker 1,000 records
Record Settings
Interval Graphs 1 cycle to 4-hour interval; stop-when-full or wrap-around
Significant Change 1V to 8V in 1V steps
Flicker Settings User-defined or IEEE 1453 / IEC 61000-4-15 / IEEE 141
Waveform Capture Voltage and current threshold, periodic capture, waveshape, and event cross triggers
Power Supply Requirements
Power Consumption Less than 5 watts
Environmental
Operating Temp -20°F to +135°F, -28.89°C to 57.22° C
Shock 60 Hz to 2 kHz, 25G acceleration
Vibration 10Hz to 60Hz, 1.8mm amplitude
Enclosure All-weather, self-contained enclosure
Physical Dimensions
Size 4.625” L x 6.75” W
Weight 2.1 lbs
Cell Modem
LTE Carrier activation SIM Card (PMI or customer provided)
External Connection SMA-connected wireless antenna
Networking Public or Private

Software

Software & Drivers

  • USB Device Driver (Windows Vista, 7, 8, 10, and 11)
  • ProVision 1.91.8990

Firmware

  • Latest Provision Firmware

Expand the Guardian’s Data Analysis Capabilities

PQ Canvass Logo

PQ Canvass

Power Monitors’ PQ Canvass is the premiere way to view and analyze power quality data. Born from Canvass, our first generation cloud-based system, PQ Canvass is a powerful platform to collect, analyze, and get alerts from field devices connected through LTE cell, WiFi, or Ethernet. With connected devices and PQ Canvass come instant alerts, unlimited PQ data storage, and powerful reporting tools. Versatility is an important factor in PQ Canvass, allowing one to view data both in the office on a desktop, and on-the-go using a tablet or smartphone; the only requirement is internet access.

Learn more about PQ Canvass →

Merlin Logo

Merlin™

Merlin™ reads every waveform, chart, and compliance report in your PQ Canvass account—then writes the summary you’d spend hours creating. It identifies what matters, cites IEEE and ANSI standards, and explains each event in clear, human language. No guessing, no black box—just faster, defensible insight you can trust. With Merlin™, engineers spend less time digging through data and more time solving real power-quality problems.

Learn more about Merlin™ →


Merlin

Have a power quality question? Ask Merlin™ — free. Email askmerlin@powermonitors.com or text (540) 383-3144.

Downloads

Manuals & Instructions

  • Guardian Manual

Documents

  • How the Cell Guardian Reduces Truck Rolls Infographic
  • Z-Card

Specification Sheet

  • Guardian Spec Sheet

White Papers

Cybersecurity and Cell Communications with the Guardian, Revolution, & Boomerang

Configuring Alerts with a Guardian in PQ Canvass

Getting PQ Data from your SCADA System

Click Here for Product-Related White Papers

Videos


FAQ

What meter socket does the Guardian fit?

The Guardian is designed to drop into a standard 200A 2S residential meter base alongside the existing revenue meter, without disrupting customer service.

Does the Guardian keep working during a power outage?

Yes, for up to one minute. The Guardian contains no batteries — it uses super capacitor ride-through, which lets it continue sending alerts and messages through an interruption.

How much data can the Guardian store?

16 MB is standard, with 128 MB, 512 MB, and 1 GB options. The recorder holds 1,000 significant change records and 1,000 flicker records.

What does the Guardian measure?

RMS voltage and current, real, apparent, and reactive power, power factor, displacement power factor, phase angle, energy, and harmonics to the 51st order with magnitude, phase, and THD. It also supports CBEMA and ITIC curve analysis.

How does the Cell Guardian connect?

Through an internal LTE modem with an SMA-connected external antenna, using a SIM supplied by PMI or by the customer, on either a public or private network. Wi-Fi is also available as an option.

How is the Guardian different from the iVS-2SX+?

The Guardian adds power factor, demand, phase angle, harmonics to the 51st, CBEMA/ITIC recording, enhanced waveform capture, email and text alerts through PQ Canvass, network time sync, and optional Wi-Fi or cellular connectivity, with memory up to 1 GB.

How do I analyze data from the Guardian?

Guardian data is stored and analyzed in PQ Canvass, PMI’s cloud platform, with Merlin™ providing AI-assisted analysis and reporting.

How do I ask a power quality question about my Guardian data?

Email Merlin™ at askmerlin@powermonitors.com or text (540) 383-3144. Merlin™ is PMI’s AI assistant, trained on 425+ technical white papers.

How can I download my data from the Guardian if I don’t have a cell or WiFi Guardian?

All Guardians include a USB-A cable for manual data download to a computer, so you can retrieve your data even without cell or WiFi connectivity.

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Have a PQ question? Ask Merlin™ — free. Send it to askmerlin@powermonitors.com or text (540) 383-3144.

Power Monitors, Inc. — Tools you Need. People you Trust.

Power Monitors, Inc. is an industry-leading product design and manufacturing firm based in Mt. Crawford, Virginia. PMI® strives to solve power quality problems by listening to our customers and working with them to design and manufacture products. Total customer satisfaction is the primary goal of all PMI® staff.

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