BQG-FB Explosion proof lifting weight limiterDetailed product description：

I. Overview
The BQG-FB series explosion-proof lifting weight limiter is suitable for explosion-proof gantry cranes, explosion-proof electric hoists, and other lifting equipment used in explosive environments. It is a safety protection device that prevents overloading during lifting operations in explosive environments.
The BQG-FB series explosion-proof lifting weight limiter is designed according to the requirements of GB-12602-90 "Safety Technical Specification for Overloading Protection Devices of Cranes", GB3836.1-2000 General Requirements for Explosion proof Electrical Equipment for Explosive Environments, GB3836.2-2000 Explosion proof Electrical Equipment for Explosive Environments Explosion proof Electrical Equipment "d", GB3836.4-2000 Explosion proof Electrical Equipment for Explosive Environments Inherent Safety Circuit and Electrical Equipment "i".
The BQG-FB series explosion-proof lifting weight limiter consists of four parts: sensors, explosion-proof chambers, explosion-proof junction boxes, and display instruments. The explosion-proof chamber adopts a cylindrical explosion-proof structure, which can withstand the explosive pressure of the internal explosive gas mixture and prevent the propagation of the internal explosive mixture. The circuits of the sensor display instrument and other related parts are isolated by safety barriers. A self recovery fuse is installed in the power supply part, and the explosion-proof chamber is connected to the external related parts through a locking nut, so that the entire system can meet the requirements of Class IIC explosion-proof.

2、 Main technical indicators of BQG-FB explosion-proof lifting weight limiter

1. Environmental temperature: -20 ℃ to+60 ℃
Environmental humidity: 90% RH
2. Power supply voltage: 36VAC ± 15% 50Hz
3. Display error ≤± 3%
4. Comprehensive error ≤± 5%
5. Alarm point setting
(1) Pre warning point: 90% of the rated lifting capacity shall not cut off the power supply of the lifting circuit;
(2) Delay alarm point: 105% of the rated lifting capacity, with a delay of 1-2 seconds to cut off the power supply of the lifting circuit; (3) Immediate alarm point: 130% of rated lifting capacity.
6. Sensor overload capacity: 1.5 times.
7. Control relay contact capacity: 220V, 15A
8. Explosion proof protection level.
① Explosion proof level of explosion-proof electrical control box: d (ia) Ⅱ CT4; Protection level: IP54.
② Explosion proof grade of instrument box: ia Ⅱ CT4; Protection level: IP42.
③ Explosion proof grade of sensor: ia Ⅱ CT4; Protection level: IP65.
The limiter instrument is available in two forms: with digital display and without digital display, for users to choose from, but both have overload alarm limit function.