Intrinsically Safe Earthing Resistance Monitor (Ex ia)
Intrinsically safe (Ex ia) earthing resistance monitoring device for hazardous areas requiring the highest protection level.
Intrinsically Safe Earthing Resistance Monitor (Ex ia)
Performance Overview:
The HD-HLDZ-RS485/Ex earthing resistance monitor is specially designed for online monitoring of earthing systems in explosive atmospheres. It accurately monitors the connection status of earthing down conductors, earthing resistance and metal bonding resistance. The device adopts non-contact measurement technology - the earthing wire only needs to pass through the sensor for detection, supporting real-time online monitoring. It is equipped with an RS485 communication interface and supports the Modbus-RTU standard protocol, making it easy to integrate into existing industrial control systems or for secondary development to achieve remote centralized monitoring. The aluminium alloy housing provides explosion-proof and impact-resistant performance while withstanding rain, sand and dust, ensuring all-weather stable operation.
Features: High accuracy, good stability and reliable performance; supports Modbus-RTU communication protocol for easy secondary development; aluminium alloy housing with high safety protection rating.
Technical Parameters:
| Model | HD-HLDZ-RS48/Ex |
|---|---|
| Explosion-proof mark | Ex ia IIB T3 Ga |
| Power supply | 6VDC~12VDC, 50mA Max. (external power) |
| Resistance range | 0.01Ω~100Ω |
| Resistance measurement accuracy | ±2%rdg±3dgt (20℃±5℃, below 70%RH) |
| Resolution | 0.001Ω |
| Lightning interference immunity | ≤100kA (8/20us) |
| Communication | RS485 (supports Modbus RTU protocol) |
| Overflow indication | Overflow value reads 500Ω on command |
| Range switching | Fully automatic |
| Protection rating | IP66 |
| Operating temperature & humidity | -20℃~55℃; 20%RH~90%RH |
| Dimensions L*W*H | 188.6mm×165.5mm×79mm |
| Earth wire through-hole aperture | 51mm×27mm |
| Mounting | Earth wire passes through the sensor center hole |
Applications: Suitable for outdoor installation in explosive places such as gas stations, oil depots and chemical plant areas.
Back-end Management System:
After installation, users can log in to the back-end management system with the account information provided by the manufacturer to view the device status and the earthing resistance data collected by the device.
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