Most power quality analyzers are built around a single assumption: someone will carry them to a site, run a monitoring campaign for a week, then retrieve them. The Inspector V4 was built around a different assumption entirely, that your facility never stops, and your monitoring should not either.
This is a full technical breakdown of what the Inspector V4 is, how it works, and why it represents a different class of instrument from the portable analyzers that dominate the market.
What Kind of Instrument Is This?
The Inspector V4 is a permanent power quality monitoring system, designed to be installed once and left running indefinitely. It is not a field survey instrument. It does not need an engineer on-site to operate. Once installed, it captures every power quality event on your network continuously, stores the data locally, pushes it to your systems in real time, and alerts your team the moment something goes wrong.
The distinction matters because the failure modes of a portable analyzer are exactly the failure modes you do not want in a critical facility. A portable instrument misses events that happen between deployments. It does not record the event that caused the outage, only what comes after. It requires human intervention to retrieve, download, and analyze data. The Inspector V4 eliminates all three failure modes by design.
Dual Isolated 3-Phase Channels
The defining hardware capability of the Inspector V4 is its two fully isolated 3-phase measurement channels. Each channel carries five voltage inputs and five current inputs, providing a complete picture of any standard wiring topology, 1P2W, 3P3W Delta, or 3P4W Star.
Running two independent channels simultaneously opens measurement scenarios that a single-channel instrument cannot address. You can monitor utility supply on Channel 1 and UPS output on Channel 2, comparing power quality on both sides of your conditioning equipment in real time. You can watch two feeders simultaneously to understand load distribution and identify whether a disturbance originates upstream or downstream. For any facility where a single channel leaves a blind spot, the Inspector V4 closes it.
No other permanently-installed power quality analyzer in its class offers two fully isolated 3-phase channels.
24-Bit ADC and IEC 61000-4-30 Class A Certification
Measurement accuracy in the Inspector V4 is anchored by a 24-bit analog-to-digital converter sampling at 32 kS/s per input. For context, most instruments in this category, including several marketed as Class A, use 16-bit ADC. The additional bit depth translates directly to greater dynamic range and finer resolution at low signal levels, which matters most when characterizing low-amplitude harmonic content or detecting small voltage deviations.
The Inspector V4 holds IEC 61000-4-30 Class A certification across all measurement parameters. Class A is the highest accuracy tier defined by the standard, required for regulatory compliance, contractual power quality reporting, and any measurement that may be used in a legal or financial dispute. Class B instruments are suitable for general surveys; Class A is required when the results need to hold up.
Measured parameters include: RMS voltage and current (0–1000V / 0–1000A, accuracy ±0.5% / ±2%), active, reactive and apparent power per phase and total, THD and full harmonic spectrum including interharmonics, voltage flicker (Pst and Plt), voltage unbalance, K-factor, event detection for dips, swells, interruptions, transients, and inrush, with ±5 cycle pre/post event capture at 32 kS/s per input, and complete energy measurement (kWh, kVArh, kVAh).
6-Hour Battery Backup: Recording Through the Outage
The Inspector V4 carries a 6,700mAh Li-ion battery pack (4S2P configuration, 14.5VDC) providing approximately six hours of continuous recording during a mains power failure. This is not a holdover capability, it is a core design requirement for Class A compliance in a permanent installation.
The critical measurement scenario that most power quality data loggers miss is the event that caused the outage. A voltage collapse, a severe transient, a fault, whatever initiates the interruption, is recorded in full by the Inspector V4 because it continues operating on battery the moment supply fails. When power is restored, the complete event record is already in storage. The instrument never missed a cycle.
Storage Architecture: 16GB Flash and Expandable SD
Local storage consists of 16GB internal flash combined with a 32GB SD card expandable to 256GB. At full-resolution continuous recording, this represents years of on-device data without requiring retrieval, offload, or redeployment.
The storage architecture is complemented by real-time data push via nine industrial protocols. The Inspector V4 does not store data and wait for someone to come and download it. It writes to local storage as a permanent record while simultaneously streaming live data to your platform. The two functions are independent, a network outage does not interrupt local logging, and local storage fills are not needed before data reaches your SCADA or cloud system.
Protocol Suite: 9 Industrial Protocols, No Middleware
SCADA and BMS integration in the Inspector V4 requires no third-party gateways or additional hardware. Nine protocols are built in natively: Modbus, BACnet, IEC 61850, DNP3, MQTT, SNMP, HTTP/HTTPS, IEC 62056, and Email.
This covers the full range of integration environments. Modbus and BACnet handle building management systems. IEC 61850 and DNP3 address utility substation and grid-connected applications. MQTT and SNMP serve IoT and cloud platforms. HTTP/HTTPS enables custom web integrations. IEC 62056 covers energy metering communications. Email provides human-readable alerting without requiring any external notification infrastructure.
Real-time alerts fire automatically on configurable thresholds, voltage events, power quality violations, measurement anomalies. Your team is notified before a problem escalates, not after someone reviews a downloaded dataset.
Expansion Modules: Beyond Power Quality
Inspector V4 accepts four expansion modules that extend its measurement capability into adjacent domains. The THPAQ module monitors temperature, humidity, atmospheric pressure, CO₂, TVOC, NOx, particulate matter (PM1/PM2.5/PM10), and 3-axis vibration, covering air quality and mechanical environment in a single device. The MMU (Motor Monitoring Unit) adds non-invasive current transformer monitoring for motors and pumps at up to 100A per phase, enabling load health assessment without breaking the circuit. The SIB module provides eight 4–20mA analog sensor inputs for interfacing any process sensor with a standard industrial output. The SMU handles H₂S and SO₂ toxic gas detection for environments where hazardous gases are a concern.
A single Inspector V4 installation with appropriate modules consolidates measurements that would otherwise require separate environmental monitors, motor health instruments, and gas detection systems from multiple vendors, each with their own data streams, protocols, and interfaces.
Physical and Electrical Specifications
The Inspector V4 operates from 90–264VAC / 47–63Hz at 60W, with an IEC 60601-1 compliant power supply suitable for medical environments. The enclosure is rated IPx1 for indoor installation. Operating range is 0–50°C with 10–85% RH. Physical dimensions are 278 × 222 × 114mm at 5kg installed weight. Connectivity includes 2× Gigabit Ethernet (internet and local), 6× RS-485 via RJ45, 2× USB 2.0, and 1× HDMI 2.0. Processing runs on a quad-core ARM Cortex-A72 at 1.5GHz with 2GB RAM. Certifications include TÜV Rheinland, CE, RoHS, WEEE, REACH, UN38.3, IEC62133, and UL.
Where It Fits
The Inspector V4 was designed for facilities where power quality data is not a periodic audit result but an operational requirement. Industrial facilities with sensitive process equipment. Data centers where downtime cost is measured in revenue per minute. Medical environments where power integrity is a patient safety issue. Telecom infrastructure where uptime commitments are contractual. Buildings with complex energy management and reporting obligations.
If your facility currently runs periodic power quality campaigns with a portable analyzer and retrieves data manually, the Inspector V4 replaces that cycle with continuous, permanent, automated monitoring, without the gaps between campaigns, without the logistics of instrument deployment, and without the event records you lose every time the outage is also the thing that switched off your analyzer.
Inspector V4 is available from inspector-network.com. For technical specifications, datasheet download, and product enquiries, visit the product page.