FR Grounding Resistance Monitoring Module (Explosion-Proof)
Precision three-wire explosion-proof grounding monitoring: grounding resistance 0.01Ω~2000Ω and earth voltage 0.1~600V measured together, rated Exd IIC T4 Gb.
Overview
Key Features
Precision three-wire measurement
Three-wire grounding resistance measurement gives better comparability between readings.
Dual-parameter monitoring
Grounding resistance and earth voltage measured by one module.
High-level explosion protection
Exd IIC T4 Gb, suitable for hydrogen and acetylene IIC atmospheres.
Multiple communication options
RS485 as standard, Zigbee, Ethernet or 4G optional.
Wide supply compatibility
DC12V or AC220V, with solar or lithium battery options.
Rugged construction
Aluminium alloy flameproof enclosure rated IP65.
Technical Data
| Grounding resistance range | 0.01Ω ~ 2000Ω |
| Earth voltage range | 0.1V ~ 600V |
| Measurement principle | Precision three-wire method |
| Accuracy | ±2%rdg±3dgt |
| Explosion-proof rating | Exd IIC T4 Gb |
| Communication | RS485 (standard) / Zigbee / Ethernet / 4G |
| Power supply | DC12V / AC220V; solar or lithium battery optional |
| Enclosure | Aluminium alloy, flameproof |
| Degree of protection | IP65 |
| Operating temperature | -20℃ ~ 60℃ |
Models & Selection
| Parameter | FR-01111 | FR-01112 |
|---|---|---|
| Grounding resistance range | 0.01Ω~2000Ω | 0.01Ω~2000Ω |
| Earth voltage range | 0.1V~600V | 0.1V~600V |
| Explosion-proof rating | Exd IIC T4 Gb | Exd IIC T4 Gb |
| Power supply | DC12V / AC220V | DC12V / AC220V |
Model naming rule：FR-01111 FR-01112
Installation
FAQ
What is the explosion-proof rating and where can it be used?
The module is rated Exd IIC T4 Gb in a flameproof aluminium alloy enclosure. It can be used in IIC gas atmospheres such as hydrogen and acetylene, and in petrochemical process areas.
Which parameters can be measured at the same time?
Grounding resistance from 0.01Ω~2000Ω and earth voltage from 0.1V~600V are measured simultaneously. Both values are read and uploaded by the same module.
What measurement principle is used?
The module uses the precision three-wire method. That is the method suited to grounding systems that need absolute verification and re-checking rather than trend-only loop measurement.
How are communication and power configured?
RS485 is fitted as standard, with Zigbee, Ethernet or 4G optional. Power can be DC12V or AC220V, and a solar or lithium battery supply can also be specified for the installation.
What certification applies and how is pricing provided?
Certification is held through a CE / CMA / CNAS accredited laboratory. Price is quoted per model and supply option; Request a quote with the model code plus the supply and communication configuration.