IoT Solution for Remote and Continuous Monitoring of Grounding Systems
Smart monitoring for predictive maintenance of earthing installations.
TOHMY® measures the impedance of grounding systems and automatically transmits the data remotely. The information can be accessed through a mobile app or a centralized web platform, where it is recorded and monitored in real time.
It incorporates a continuity detector that identifies resistance increases caused by oxidation, poor connection, or an open control bridge, allowing action to be taken before the failure becomes critical.
Thanks to continuous data logging, together with a machine learning algorithm, TOHMY® predicts system evolution and anticipates the necessary maintenance interventions.
The range consists of two models, which differ in the method used to measure the impedance of the grounding system: TOHMY® (model TG100), which uses the fall-of-potential method, and TOHMY+® (model TG200), which uses the loop method.
- Predictive maintenance: Continuously monitors the condition of the grounding system, allowing maintenance teams to anticipate failures and intervene only when required.
- Continuous monitoring: Supervises the grounding installation 24/7 without the need for scheduled inspections or on-site visits.
- Immediate alerts: Automatically notifies users whenever an anomaly is detected, enabling a rapid response to potential problems.
- Remote access: Monitor every installation from anywhere through the web platform or mobile application, available 24/7.
- Lower maintenance costs: Reduce unnecessary inspections, travel expenses and corrective interventions while extending the service life of the installation.
- Regulatory compliance: Automatically stores measurement records, providing full traceability for inspections, audits and maintenance reports.
- Centralized management: Manage multiple TOHMY® devices installed across different locations from a single online platform.
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The TOHMY® (model TG100) is a device for remote measurement of earth resistance that meets the following technical specifications:
- Measurement of the impedance of grounding systems using the fall-of-potential method.
- 2 independent measurement channels: ground (CPE) and continuity.
- Measurement connections: 5x female banana connectors, with approx. 300 mm cable length and 5 conductors of 1.5 mm² (15 AWG).
- Measurement range: 0 to 2000 Ω (single scale).
- AC signal frequency: up to 2 kHz, with an optimal range from 100 Hz to 1 kHz.
- Error (both channels): ±3% or <0.5 ohm for working frequency and resistance ranges.
The TOHMY+® (model TG200) is a device for remote measurement of earth resistance that meets the following technical specifications:
- Measurement of the impedance of grounding systems using the loop method.
- Measurement sensor with 2 wound excitation cores generating voltage and 1 wound core for current reading, with 8x1 mm² cable of 700 mm length.
- Suitable for conductors up to 13 mm Ø (120 mm² cross-section).
- Measurement range: 0 to 500 Ω (single scale).
- AC signal frequency: from 500 Hz to 2500 Hz.
- Accuracy: ±10% or <0.5 ohm for working frequency and resistance ranges.
Both models share the following technical specifications:
- Signal generator with sinusoidal waveform, and self-calibration and self-test using precision resistors.
- Reading process duration: approx. 500 ms.
- Dimensions: 110 x 170 x 40 mm. Plastic housing in ASA material, IP68, weather-proof and UV-resistant.
- User interface with 2 push buttons (power on/off and device connection) and 4 LED indicators (operation status and battery level, data network connection, device connection operation, and acquisition and measurement activity).
- Power supply: 3.3 to 5.5 VDC, from 3x 1.5 VDC AA batteries, an external 5 VDC nominal power supply (not included) or a USB charger connection.
- Real-time clock (RTC) automatically synchronized via SNTP protocol, and schedule planner for measurement programming.
- 2.5 GHz band for Wi-Fi (UDP) and optional Bluetooth, with integrated antenna.
- Virtual COM port via USB and internet access in Wi-Fi station mode, with RF transmission power level configurable between 10 and 20 dBm.
- MQTT client with connection to AWS broker (default) and secure encrypted layer with certificates.
- Monitoring through mobile application via wireless connection.
- 5-pin extension port for external sensors (humidity, temperature, pH...), communication ports and/or external power supplies.
Both TOHMY® models have undergone electromagnetic compatibility testing and conformity assessment: CE marking. Their electronics comply with RoHS, and their operating temperature range is -20 °C to +45 °C.
