WTZ-A200 Overload Limiter

1. Product Introduction

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​The WTZ-A200 Load Limiteris adual-hook independent monitoring system(certified to the national standard GB12602-90) developed by Weite Electronics. Housed in an off-white industrial chassis, it is equipped with two 0.8-inch high-brightness nixie tubes that display the load of the main and auxiliary hooks on split screens in real time. Validated in the market for 15 years, it features a measurement accuracy of ≤±5% (F.S), an IP65 protection rating and a wide temperature range of -20℃~60℃, making it a core safety protector for various types of cranes such as portal cranes and gantry cranes.

​2. Main functions​

​Dual-Channel Precise Monitoring and Active Protection​

• ​Independent Dual-Hook Measurement:​→ Independent load display for main/auxiliary hooks (dual windows for "Main Hook T" / "Auxiliary Hook T")
• ​Three-Level Safety Response​→ ​Early Warning Level:Overload triggers an alarm (＞60dB)Control Level:Relays cut off power when overloaded (≤2 channels of output)
• ​Expandable IoT Capability:RS485/4-20mA interfaces support external large screensThe RS485/4-20mA interface supports external large screens

​3. Typical Applications & Optional Configurations

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​Standard Safety Deployment Solution for Gantry Cranes​

​① Core sensing layout​

• ​Fixed pulley sensor: Real-time force measurement at the steel wire rope turning point
• ​Weight sensor: Load monitoring at the main beam support end

​② Control terminal​

• Key area: Four-key operation for "Set - Increase - Decrease - Tare"
• Indicator lights: Three-color (red/yellow/green) working condition warning

​③ Optional Enhanced Kits

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• ​Anti-Overwinding Switch:Mechanical + electrical dual protection against hook overhoisting
• ​External large screen: 8-inch LED dot matrix screen (visible within 30 meters)

4. Core advantages​​

Military-grade reliability proven over 15 yearsis rooted in the accumulation of practical data from more than 1,000 extreme working conditions. Our continuously upgraded instruments have passed verification in 427 harsh environments, from startup and shutdown in extreme cold of -30℃ to full-load operation in high temperature of 70℃. The redundant design has passed the national standard GB/T2423.4 alternating damp heat test. Each device undergoes 1,000 hours of accelerated aging screening at 85℃/85% humidity and a 72-hour continuous full-load test before delivery, ensuring a 10-year maintenance-free service life. The longest-serving device tested by port users has operated without failure for 14 years.

​Genuine zero-threshold human-machine interactionsimplifies operation and maintenance. Rail clip-on installation can be completed in three minutes (no tools required); voice prompts directly report the root cause of faults when they occur, and the reset key clears alarms with one click. Patented adaptive technology eliminates the need for calibration after relocation, with accuracy always maintained within ±0.5%F.S. A logistics group reported that the relocation of 37 portal cranes in its fleet was completed by ordinary electricians, with an average time of only 4.2 hours for the entire line.

​Open architecture meets full-domain protocol requirements:LoRa/4G dual-mode wireless transmission covers an open area of 10 kilometers, and the three-way interface of RS485+4-20mA+Ethernet directly connects to the PLC system. 4 channels of relays (10A/250VAC) support customized 32-stage load curves. The stepless alarm solution customized for Tangshan Port last year successfully reduced the light-load impact damage of ship unloaders by 82%.

​5. Technical parameters

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• ​Display unit: 2 × 0.8-inch high-brightness nixie tubes
• ​Monitoring Capability:→ Input signals: ≤2 channels of independent weight sensing → Error control: ≤±5%F.S (full scale)
• ​Environmental Resistance:: → Temperature: -​20℃~+60℃​| Humidity: 90% non-condensingProtection rating: ​IP65​(water and dust spray resistant)
• ​Electrical Characteristics:: → Power Supply:​AC220V±10%​| Power consumption: ＜30W→Alarm volume: ＞60dB (clearly audible within 15 meters)

​6. Installation specifications

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​Compact industrial design​

• ​Chassis Dimensions:(L)​250mm​× (W)​164mm​× (D)​70mm​(About the size of two dictionaries)
• ​Structural features​：→ ​Mounting holes：4 × Φ4.5mm through holes (hole spacing: 228×142mm)Key area: Waterproof silicone keys for "Set/Increase/Decrease/Tare"

  → ​Bottom interface(left to right):

  • Power input (brown/blue line)
  • Control output (yellow terminal block)
  • Main hook sensor signal (gray wire)
  • Auxiliary hook sensor signal (white wire)
• ​Wall Mounting Requirements:Screw depth: ≥10mm | Shock-absorbing rubber gaskets are required (to resist vibration of port machinery)

Similar Model：WTL-A200 Load Moment Limiter