HJ-301 Generator Digital Meter Hour Voltage Frequency Indicator Meter AC 220~450

Product Specifications

• Model: HJ-301
• Product Name: 3-in-1 Generator Digital Multi-Function Meter
• Input Power Supply: AC 220 ~ 450V
• Measuring Items: Voltage, Frequency, Cumulative Running Hours
• Frequency Range: 45 ~ 65Hz
• Max Timing: 99999.9H (Power-off Memory)
• Installation Cutout: 45mm × 45mm
• Shell Material: Flame Retardant ABS + Sealed Glue Circuit Board
  Net Weight：0.35KG
  Package：Carton Packaging
  Warranty:6 Months Factory Warranty

Wide Application Range

• 2KW~15KW Single-phase portable gasoline & diesel generator sets
• Household emergency power supply, farm irrigation standby generator equipment
• Construction site temporary lighting, small engineering mobile power units
• Small supermarket, rental commercial standby generator control cabinet
• Agricultural machinery supporting power generator, marine auxiliary single-phase power equipment
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Key Product Features

1. Three-in-One Integrated Design, Replace Multiple Single Meters At Once
   Integrates voltmeter, frequency meter, hour meter three functions into one unit, saves panel installation space, simplifies wiring, effectively reduces wiring faults and maintenance costs. One button switches display pages to view voltage, frequency and running hours respectively.
    
2. Wide AC 220-450V Voltage Input, Global 50/60Hz Adaptive
   Compatible with single-phase 230V domestic generators and three-phase 380V line voltage measurement, automatically adapts to 50Hz/60Hz power grid standards in various countries, widely used for domestic and export generator equipment.
    
3. Power-off Data Permanent Storage Function
   Built-in high-capacity memory chip, the cumulative running hour data will never be lost after power off, which can accurately record the total working time of the generator, remind users to replace engine oil, filter and carry out regular maintenance on schedule, effectively extend the service life of the engine.
    
4. Industrial Sealed Glue-Filled Circuit Board + Flame Retardant Shell
   Dust-proof, moisture-proof, shock-resistant and anti-interference design, effectively prevents instrument failure caused by humid environment, oil pollution and vibration of the generator unit, suitable for long-term outdoor harsh working conditions.
    
5. Standard Embedded Quick Installation With Fixed Clips
   45×45mm universal square panel opening size, equipped with two spring fixing brackets, plug and lock installation without screws, can directly replace traditional analog pointer meters, no need to modify the generator control cabinet.
    
6. High Precision Sampling Chip, Stable & Accurate Measurement
   Voltage measurement accuracy ±1.0%, frequency accuracy ±0.2Hz, no data drift or display jitter under load sudden change, can timely reflect abnormal output such as overvoltage, undervoltage and frequency drift of the generator.
    

Common Equipment Failures Solved

• Old-fashioned single pointer voltmeter / frequency meter has low accuracy, difficult to read data, unable to record running hours
• Separate mechanical hour meter is easy to get stuck and invalid, maintenance cycle cannot be accurately tracked
• Generator overvoltage, undervoltage or frequency deviation cannot be found in time, resulting in burning of electrical load equipment
• Multiple separate instruments occupy too much cabinet space, complicated wiring and high hidden danger of short circuit
• Ordinary hour meter resets to zero after power failure, unable to count the total service life of the unit