UNI-T UT255E Wireless High Low Voltage Hook Ammeter adalah alat ukur arus AC profesional tipe hook/clamp yang dirancang khusus untuk pengukuran arus, arus bocor (leakage current), frekuensi, dan beban listrik pada instalasi tegangan rendah maupun tegangan tinggi tanpa harus memutus jaringan listrik. Alat ini diproduksi oleh UNI-T dan banyak digunakan pada gardu listrik, jaringan distribusi PLN, industri berat, pemeliharaan transformator, hingga inspeksi kabel bawah tanah.
UT255E menggunakan sistem pengukuran hook-type CT (Current Transformer) dengan desain penjepit kait besar yang dapat digantung langsung pada kabel atau busbar bertegangan. Sensor hook tersebut dilengkapi koil fleksibel ganda (double-layer flexible coil) yang membuat alat lebih ringan, presisi tinggi, memiliki linearitas baik, dan mampu membaca arus besar hingga 20.000A AC. Sistem ini sangat cocok untuk pengukuran pada kabel besar dan area yang sulit dijangkau.
FITUR UNI-T UT255E
| Technical Specifications | |
| AC current (Auto range) | 0～99.9A;10mA ;±2%±5dgt |
| 100A～6000A; 10mA; ±3%±5dgt | |
| 6.00kA～20.0kA; 10mA; ±4%±5dgt | |
| Frequency | 45Hz～75Hz; 0.1Hz; ±1Hz (50/60Hz, auto) |
| Accuracy guaranteed temperature and humidity | 23℃±5℃, below 80%RH |
| Features | |
| Function | 1, High/low voltage leakage current, Current and frequency test; 2, Grounding current test of the iron core, transformer load; 3, Leakage current test of multicore cable. |
| Testing method | Hang the hook-type CT onto the line for testing |
| Transmission mode | 433MHz wireless transmission |
| Phase detecting distance | About 150m (Straight-line distance) |
| On-line voltage | Bare conductor: <35kV Sheath-insulated cable: <110kV |
| Large diameter hook | Measurable wire & cable.: Max. Ф168mm Measurable busbar: Ф168mmx245mm |
| Sample rate | 2 times/sec |
| Screen | 3.5 inch true color LCD; Backlight brightness adjustable |
| Position error | Area A: No position error; Area B: Increase by about 0.2%; Area C: Increase by about 2% |
| Data | 9999 set of data can be stored. |
| Press HOLD button to hold/disable data | |
| Overrange indication | “OL A” is displayed |
| No signal indication | The symbol “—-” is displayed dynamically |
| Power | Lithium battery (with USB charging port) |
| When low voltage, the low voltage symbol is displayed | |
| About 10 hours working time; | |
| Auto power off if no operation in 15 minutes. | |
| Weight | Hook detector: 496g (including battery) |
| Receiver: 395g (including battery) | |
| Insulation rod: 1.45kg | |
| Total weight: 11.5kg (including ammeter box) | |
| Dimension | Hook detector: 310 × 270 × 52mm (L*W*H) |
| Receiver: 250 × 100 × 40mm (L*W*H) | |
| Insulation rod size | Stretched length: about 5m Retracted length: about 1m |
| Operating temperature and humidity | -10℃～40℃；below 80%Rh |
| Storage temperature and humidity | -10℃～60℃；below 70%Rh |
| Signal Interference | No 433MHz co-channel signal interference |
| Insulation strength | Insulation rod: AC 110kV/rms |
| Detector: 2000V/rms | |
| Receiver: 2000V/rms | |
| Structural design | Anti-drip type II |
