UNI-T 168MM WIRELESS HIGH LOW VOLTAGE HOOK AMMETER UT255E | 45HZ～75HZ | 150M WIRELESS TRANSMISSION DISTANCE | 0～20000A AC CURRENT MEASUREMENT MEASURABLE BUSBAR | TEST LEAKAGE CURRENT, CURRENT, FREQUENCY, LOAD

UNI-T UT255E 168mm Wireless High & Low Voltage Hook Ammeter

The UNI-T UT255E Wireless Hook Ammeter is a professional high-current electrical testing instrument designed for measuring AC current, leakage current, frequency, and electrical load in high- and low-voltage applications. With an impressive 0–20,000A AC current measurement range, the UT255E is suitable for large conductors, thick cables, and busbars.

Featuring a large 168mm hook detector, the UT255E can measure wires and cables up to 168mm in diameter and busbars up to 168mm × 245mm. Its hook-type CT can be attached to the line for measurement, making it particularly useful for applications where conventional clamp meters are difficult to position.

The UT255E includes a wireless receiver with up to 150 metres of wireless transmission distance, a telescopic insulating rod extending to approximately 5 metres, a 3.5-inch true-colour LCD, built-in double-layer flexible coil, adjustable backlight, and storage for up to 9999 sets of measurement data.

What Is the Purpose of the UNI-T UT255E?

The main purpose of the UNI-T UT255E hook ammeter is to provide convenient and remote AC current measurement on large electrical conductors, cables, and busbars. Its hook-style current transformer allows technicians to attach the detector around a conductor without requiring conventional direct-contact current measurement.

The UT255E is especially useful for leakage current testing, transformer load inspection, grounding current testing, cable inspection, frequency measurement, and electrical load monitoring. It is designed for applicable bare conductors below 35kV and safety-insulated cables below 110kV, subject to the manufacturer's operating conditions and required safety procedures.

How to Use the UNI-T UT255E Hook Ammeter?

1. Inspect the equipment: Check the hook detector, wireless receiver, telescopic insulating rod, battery, and insulation components before starting the measurement.
2. Assemble the insulating rod: Connect the telescopic insulating rod to the hook detector and extend it to the appropriate working length according to the operating instructions.
3. Power on the detector and receiver: Turn on the UT255E and wireless receiver and confirm that the wireless communication is operating correctly.
4. Select a suitable measurement function: Use the appropriate mode for AC current, leakage current, frequency, or load measurement.
5. Position the hook detector: Using the insulating rod and following the required electrical safety procedures, position the hook detector around the target conductor, cable, or busbar.
6. Perform the measurement: The hook-type CT detects the AC current without requiring the conductor to be disconnected from the electrical system.
7. View the reading remotely: Use the wireless receiver to monitor the measurement from a distance of up to approximately 150 metres under suitable conditions.
8. Use the Hold function when required: Press the Hold button to freeze the displayed measurement for easier recording or inspection.
9. Store measurement data: Save measurement results in the meter's internal memory for later review and documentation.
10. Complete the test safely: Remove the hook detector from the conductor using the appropriate safe procedure, retract the insulating rod, and switch off the equipment after use.

Important: High-voltage electrical systems can cause serious injury or death. The UT255E should only be operated by suitably trained and authorized personnel who understand the applicable electrical safety requirements. Always follow the manufacturer's instructions, required approach distances, insulation limitations, and local regulations.

Key Features of UNI-T UT255E

• 0–20,000A AC current measurement: Provides a very wide current measurement range for large electrical systems and high-current conductors.
• 168mm large hook detector: Accommodates large wires, cables, and electrical conductors.
• Large busbar measurement: Suitable for measuring busbars up to 168mm × 245mm according to the supplied product information.
• 150m wireless transmission: Sends measurement data to the wireless receiver from a distance of up to approximately 150 metres under suitable conditions.
• Hook-type CT measurement: Allows the detector to be hung onto the line for convenient current measurement.
• Built-in double-layer flexible coil: Provides a flexible sensing arrangement designed for large conductors and challenging measurement positions.
• Leakage current testing: Suitable for checking leakage current in applicable electrical systems and thick multi-core cables.
• Transformer load testing: Supports current measurement applications for checking transformer load and grounding current.
• Frequency measurement: Measures AC frequency across the specified 45Hz–75Hz range.
• 3.5-inch true-colour LCD: Provides a large, clear display for viewing electrical measurements.
• Adjustable backlight: Allows the display brightness to be adjusted for different working environments.
• 9999-set data storage: Stores a large number of measurement records for later reference.
• Telescopic insulating rod: Extends to approximately 5 metres and retracts to approximately 1 metre for transportation and storage.
• Automatic ranging: Automatically selects an appropriate current measurement range for easier operation.
• Automatic power off: Turns the device off after approximately 15 minutes without operation to help conserve battery power.
• USB rechargeable lithium battery: Uses a built-in lithium battery with a USB charging port for convenient field charging.

Why Choose the UNI-T UT255E?

The UNI-T UT255E is an excellent choice when standard clamp meters cannot easily accommodate large conductors or when measurement needs to be performed from a greater working distance. Its 168mm hook opening and extremely wide 20,000A AC measurement capability make it suitable for large-scale electrical power applications.

The wireless receiver adds another major advantage by allowing measurement results to be viewed remotely from up to approximately 150 metres. This can make field inspection more convenient when the measurement point is difficult to access directly.

The combination of a telescopic insulating rod, large hook detector, flexible sensing coil, leakage current measurement, frequency measurement, data storage, and large colour display makes the UT255E a versatile solution for professional electrical inspection and maintenance.

Who Should Buy the UNI-T UT255E?

The UNI-T UT255E is designed for trained electrical professionals who require high-current and leakage-current measurement on large electrical conductors and high-voltage systems.

• Electrical power engineers
• High-voltage electrical technicians
• Substation maintenance teams
• Power plant technicians
• Electrical utility companies
• Transformer maintenance professionals
• Industrial electrical maintenance teams
• Electrical inspection technicians
• Power distribution technicians
• Electrical testing and commissioning teams
• Mining electrical maintenance teams
• Professional cable inspection technicians

Where Is the UNI-T UT255E Used?

• Substations: Measure high-current electrical conductors and inspect electrical loads during applicable maintenance operations.
• Power plants: Support high-current measurement and electrical equipment inspection.
• Transformer systems: Check transformer load and grounding current during maintenance and troubleshooting.
• Large busbars: The large hook detector allows measurement of applicable large busbar configurations.
• Thick multi-core cables: The flexible coil design is useful for checking leakage current in large multi-core cables.
• Underground cables: Supports applicable leakage current inspection of thick cables in underground and outdoor environments.
• Industrial facilities: Useful for current-load inspection, troubleshooting, and electrical maintenance.
• Power distribution systems: Supports current and frequency measurements on suitable distribution equipment.
• Electrical service departments: Helps technicians perform remote current measurement and electrical inspection.

Frequently Asked Questions About UNI-T UT255E