• Inspector™ System Components


Customizable hardware based on customer’s needs can monitor electrical and environmental parameters.

Internet connection through

Ethernet technology connected to other gateway.

(3G, 2G, Wi-Fi, ADSL)*

Cloud-based service can be accessed through mobile, PC, laptop and tablet.


Internet connectivity is provided by the customer.



  • Inspector™ System Hardware


The first component of Inspector™ MB (Main board) is the main component of Inspector™ hardware. The MB has ARM processor Cortex-M7 core with FPU (Floating Point Unit) and DSP (Digital Signal Processor) to do complex tasks and sophisticated algorithms. The ARM processor runs RTOS to ensure robustness of the firmware and handle complex tasks. All components on the MB are industrial grade with the highest reliability. The MB includes embedded industrial power supply with more than 50K guarantee working hours.


The MB has flexible connectivity options to easy connect Inspector™ like Rs-485 industry standard interface and Ethernet interface. The MB includes RTC (Real Time Clock) with small backup battery. RTC is configured to report time to the MB in accurate timing (microseconds). The MB also is capable of auto clock synchronization to time-server UTC (Coordinated Universal Time) using NTP protocol. The MB has external battery supports up to eight hours in case of main power failure to save stored data and stay connected to cloud service. The MB also includes hardware watchdog to ensure system is live and working well without any deadlocks.


The MB can measure the following parameters through VMU (Voltage Measurement Unit) and detect power quality events through WFAU (Waveform Analysis Unit):


Three Phase Voltages

Status of Main Input Power

UPS Survival Status

Ground to Neutral Voltage

Voltage Imbalance

Frequency of Power Line

Power Events Detection According to IEEE classifications of Power Quality (IEEE Std 1159-2009)

Which includes:

  1. Voltage Sags               3- Interruption       5- Under voltage
  2. Voltages Swells          4- Over Voltage      6- Voltage Transients


The WFAU executes power quality algorithms which do the following functions:

    • Power Quality events are detected using innovative algorithms according to 1159 IEEE standard
    • A zero crossing detection technique is implemented to measure frequency
    • Fast Fourier Transform is used in transients detection
    • Transients are detected in frequency range up to 4 kHz
    • Sampling rate is 8kSPS with accurate detection of any event
    • True RMS is calculated in a window for every cycle with a step of half cycle
    • Start and End of event are captured and reported accurately at least 4 Cycles before and after
    • All Sags, Swells and Interruptions are detected
    • Classification of the events is based on its period due to IEEE standard (Instantaneous, Momentary, Temporary and Sustained)
    • Voltage Imbalance between 3-Phases is measured according to IEEE standard


The MB has battery management system which supports the operation of Inspector™ in case of electrical blackout or failure of power system. The system also sends battery status periodical to ensure reliable internet connection when AC power is off. The management system is responsible for battery charging and monitors the battery health. The MB also has three channels NTC temperature sensors which are used as an auxiliary sensor for Inspector™.


The MB additionally has special unit to measure earth resistance, which is GRMU (Ground Resistance Measurements Unit). This unit measures the following parameters:


    • Earth Resistance (RE)



The second component of Inspector™ hardware is SMB (Sensor Measurement Box) which measures:

  • Temperature sensor
  • Humidity sensor
  • Air Quality sensor


All of three sensors are on the same printed board which makes the SMB an ideal solution for monitoring all environmental parameters. The SMB is connected to MB through RS-485 industry standard interface which eases installation process and enhances communication reliability. The MB can support up to 256 units of SMB & CMB in any combination or other sensors types implemented in the future.



The third component of Inspector™ hardware is CMB (Current Measurement Box) that measures:

  • Three Phase Current
  • Ground Current


All measurements process is non-invasive using clamp coils to ease the installation process and ensure the CMB has zero interference with other systems. The CMB is connected to MB through RS-485 industry standard interface which also eases installation process and enhances communication reliability.



The fourth component of Inspector™ hardware is Helium Compressor Monitoring Unit (HCMU). This unit detects the status of helium compressor (ON/OFF) non-invasive without any interference with the equipment using the clamp coils like CMB. The HCMU is connected to MB through RS-485 industry standard interface which also eases installation process and enhances communication reliability.



With these four components of Inspector™ hardware, Inspector™ becomes complete unique solution for power and grounding monitoring with environmental conditions monitoring and comprehensive tool that every field or service engineer needs it.


  • Inspector™ Hardware Block Diagram