--- title: Electricity sensor (CT clamp) technical specifications description: A 3-phase sensor consists of 3 clamps and 1 transmitter. Each clamp clips around a phase of the energy cable (of a machine). 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[Energy Management](https://support.sensorfact.eu/knowledge/hardware-installation?hsLang=en#energy-management) # Electricity sensor (CT clamp) technical specifications ## Summary: This article explains sensor configurations, sizing rules, and measurement logic to ensure accurate data collection and transmission to the bridge. ### **Hardware information** - **Wireless transmitter:** The central unit that sends data to the bridge. - **Current clamps:** - **3-Phase:** 3 clamps (clips around L1, L2, L3) - - **1-Phase:** 1 clamp (clips around the phase cable). ![](https://support.sensorfact.eu/hs-fs/hubfs/image-png-Aug-11-2026-08-53-13-2218-AM.png?width=957&height=633&name=image-png-Aug-11-2026-08-53-13-2218-AM.png) ### **Technical specifications** **Sensor configurations:** Select the correct sensor configuration based on your machine's power supply: - **3-Phase Sensors:** Standard for most industrial machines. Consists of 3 clamps and 1 transmitter. - **1-Phase Sensors:** Used for smaller machines or specific sub-components. Consists of 1 clamp and 1 transmitter. **Sizing guide:** Sensors must be matched to the **Fused Power** (Amps) and the **Cable Diameter** of the machine. | **Size** | **Range (Amps)** | **Best for...** | | --- | --- | --- | | *Small* | 0 - 60A | Light machinery, fans, pumps | | *Medium* | 60 - 200A | Standard production lines, conveyors | | *Large* | 200 - 600A | Heavy machinery, main feeds | | *XL* | 600A - 3000A | (Flexible coils) Main incomers | **Note:** Submit your requirements via the **Technical Assessment** to ensure you receive the correct hardware. ### **Measurement logic** - **Sampling:** The sensor conducts **2 measuring cycles**, lasting 30 seconds each. - **Granularity:** The system calculates the average of these cycles and transmits data at a **1-minute interval** to the software. For detailed electrical ratings and physical dimensions, consult the technical data sheets: - **Standard sensors (60A - 600A):** Click [**here**](https://sensorfact-sales.nl/wp-content/uploads/2025/03/technical_datasheet_electricity-03.25.pdf). - **Flexible sensors (600A+):** Click **[here.](https://sensorfact-sales.nl/wp-content/uploads/2024/10/technical_datasheet_electricity_300-6000A.pdf)**For more information, go to **[this article](https://support.sensorfact.eu/knowledge/measuring-above-600a?hsLang=en)**. ### **Technical troubleshooting** **Inaccurate readings** - **Check clamp closure:** Ensure the clamp is fully clicked shut around the cable. A partial gap results in low or zero readings. - **Verify sizing:** Using a large sensor on a very low-amperage cable (e.g., a 600A sensor on a 5A load) can reduce accuracy. **No connection** - **Check distance:** Ensure the sensor is within **10 meters** of the bridge with no obstacles in the way — walls, big machines, metal fencing, cabinets, etc. — or check that there’s roughly one bridge per 5 sensors in the area. - **Check shielding:** Do not place the transmitter inside a fully closed metal cabinet unless the bridge is also inside the same cabinet. 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