Ex ia I Ma (mining). MA certified (MFH220058). 240×68×54mm, 0.35kg. For underground coal mines.
| Series | Mine Explosion-proof FYF Series |
| Model | FYF20B |
| Size | 240×68×54 mm |
| Weight (excluding battery) | 0.35kg |
| Material | Flame-Retardant Conductive Engineering Plastics |
| Protection Class | IP67 |
| Power Supply | 7.4VDC/1850mAh |
| Wireless Range | ≥20m |
| Operating Current | 80mA |
| Transmit Power | ≤10mW |
| Frequency Range | 433 MHz Band: 427.000–436.300 MHz 470 MHz Band: 472.350–485.775 MHz |
| Antenna Type | built-in |
| Operating Temperature Range | Temperature: -25°C to 70°C Humidity: 0% to 97% RH (non-condensing) |
| Optional Features | Identification Card, 3-Axis Sensor |
| Transmitter Operation Modes | Button-operated |
| Explosion Protection Type | Intrinsically Safe |
| Explosion-proof Mark | Ex ia I Ma |
| Display | 2.5″ |
| Applicable Standards | GB/T 3836.1-2021 *Explosive atmospheres — Part 1: Equipment — General requirements* GB/T 3836.4-2021 *Explosive atmospheres — Part 4: Equipment protected by intrinsic safety “i”* MT/T 1137-2011 *General technical specifications for mining infrared remote controllers* |
| Dimensional Drawing |  |
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