Grounding Resistance Online Tester
Through-core online grounding resistance measurement over 0.01Ω~200Ω with 0.001Ω resolution. The split-core model can be installed without disconnecting the grounding down conductor.
Overview
Key Features
Non-contact through-core sensing
Split-core versions install without breaking the grounding down conductor.
High resolution
0.001Ω resolution captures small changes in grounding resistance.
Flexible networking
RS485 or 4G upload supports remote monitoring and trend review.
Explosion-proof certified
Ex ia IIB T3 Ga / Ex ib IIC T4 Gb ratings.
Several mounting styles
Wall mount, on the grounding conductor, closed-loop or split-core.
Wide supply voltage
DC 9V~24V external supply.
Technical Data
| Grounding resistance range | 0.01Ω ~ 200Ω |
| Resolution | 0.001Ω |
| Measurement method | Through-core (closed-loop / split-core) |
| Communication | RS485 / 4G |
| Power supply | DC 9V ~ 24V |
| Explosion-proof rating | Ex ia IIB T3 Ga / Ex ib IIC T4 Gb |
| Mounting | Wall mount / on grounding conductor / closed-loop / split-core |
| Display | LCD (type C) |
| Applications | Petrochemical plants, fuel stations, substation grounding grids |
| Degree of protection | IP65 |
Models & Selection
| Parameter | FR-01111-R | FR-01111-G | FR-12021-R |
|---|---|---|---|
| Communication | RS485 | 4G | RS485 |
| Wiring | Closed-loop through-core | Split-core through-core | Closed-loop through-core |
| Grounding resistance range | 0.01Ω~200Ω | 0.01Ω~200Ω | 0.01Ω~200Ω |
| Resolution | 0.001Ω | 0.001Ω | 0.001Ω |
Model naming rule：FR-01111-R FR-01111-G FR-12021-R
Installation
FAQ
How do I choose between split-core and closed-loop models?
A split-core model clamps around the down conductor and can be installed without disconnecting it, which suits retrofit sites. A closed-loop model requires the conductor to be threaded through it, and gives better stability and consistency.
What are the range and resolution?
Grounding resistance is measured over 0.01Ω~200Ω with a resolution of 0.001Ω. The same range and resolution apply to the models FR-01111-R, FR-01111-G and FR-12021-R.
What explosion-proof ratings are available?
The tester is rated Ex ia IIB T3 Ga and Ex ib IIC T4 Gb. Both ratings allow installation in flammable and explosive areas such as petroleum, chemical and fuel station sites.
How is measurement data uploaded to a platform?
Data is uploaded over RS485 or 4G and can also be read locally from the unit. Remote platform monitoring allows the grounding resistance history to be reviewed.
What certification applies and how is pricing provided?
Certification is held through a CE / CMA / CNAS accredited laboratory. Price and lead time are quoted per model; Request a quote with the model code, communication type and mounting style.