RY-HLDZ Explosion-Proof Earthing Resistance Monitor

RY-HLDZ-LoRa/Ex & RY-HLDZ-NB/Ex monitors are engineered to online check earthing down conductor connection, loop earthing resistance and metal bonding resistance.
It features non-contact real-time measurement with cables passing through the sensor, no self-test required. Widely used for towers, mines, meteorological lightning protection, petrochemical plants, communication stations, substations, railways, warehouses and electrical equipment. It also provides anti-theft monitoring for earthing wires and metal cables.

Type

RY-HLDZ-LoRa/Ex、RY-HLDZ-NB/Ex

Inquiry

For lightning Equipotential Bonding

100kA (10/350μs),
100kA (8/20μs)

IP66/67 Protection Level

Explosion-proof Certification Obtained

Extremely Loadable Unit

Technical Data

Item	Parameter
Explosion-proof Marking	Ex db mb IIB T6 Gb
Ingress Protection Rating	IP67
Functions	Online monitoring of loop earthing resistance, online monitoring of metal loop bonding resistance, earthing condition monitoring anti-theft monitoring for earthing conductors and metal cables
Power Supply	7.2 VDC, battery powered
Resistance Measuring Range	0.01 Ω ~ 100 Ω
Resolution	0.001 Ω
Accuracy	±2% rdg ±3 dgt (at 20°C±5°C, relative humidity below 70%RH)
Communication Mode	LoRa / NB-IoT (select one) Note: LoRa communication distance reaches 3 km (line-of-sight open area); LoRa gateway is required for LoRa communication.
Display Type	LCD Screen
Overrange Indication	LCD displays "OLQ"; the value read via command is 500
Operating Temperature & Humidity	-20°C ~ 55°C; 20%RH ~ 90%RH
Range Switching	Fully automatic ranging
Single Measurement Duration	Approx. 0.5 seconds
LCD Dimensions	47 mm × 28.5 mm
Overall Dimension LWH	205 mm × 223 mm × 168 mm
Through-hole for Earthing Conductor	51 mm × 27 mm
Installation Method	Thread the earthing cable through the central hole of the sensor
Cover Bolts	M6*30; tensile strength Rm ≥ 600 MPa, yield strength ReL ≥ 480 MPa

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RY-HLDZ Explosion-Proof Earthing Resistance Monitor

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