MEWOI3000C+ Explosion-Proof Clamp Earth Resistance Tester
Intrinsically safe clamp-on earth resistance tester certified Ex ia IIB T3 Ga for use in explosive gas atmospheres: 0.01–1200Ω loop resistance without disconnecting the earth.
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Overview
Earthing at fuel terminals, refineries, gas plants and mines has to be checked where a standard instrument cannot be taken. The MEWOI3000C+ is an intrinsically safe version of MEWOI's clamp-on earth tester, certified to GB 3836 with the marking Ex ia IIB T3 Ga (certificate CE18.2380), so it can be used in the corresponding explosive gas atmospheres.
Like other clamp-on testers it measures earth and loop resistance by clamping around the earth conductor, with no auxiliary stakes and no need to disconnect the electrode from a multi-earthed system. Readings from 0.010Ω to 1200Ω are taken in 0.5 seconds; an audible and visual alarm flags values above a set threshold (1–199Ω), and a noise indicator warns when interference may affect the result. It runs for around 30 hours on four AA alkaline cells and stores 99 readings.
Key Specifications
| Specification | MEWOI3000C+ |
|---|---|
| Resistance range | 0.010Ω–1200Ω |
| Accuracy | ±(1%rdg + 0.01Ω) at 0.010–0.99Ω; ±(1%rdg + 0.1Ω) to 49.9Ω; wider above |
| Resolution | 0.001Ω |
| Explosion protection | Ex ia IIB T3 Ga, certificate CE18.2380 (GB 3836) |
| Jaw size | 65 × 32mm |
| Measurement time | 0.5s |
| Alarm | Audible/visual, threshold 1–199Ω; interference (NOISE) indicator |
| Memory / interface | 99 readings; RS232 optional |
| Power | 4 × LR6 (AA) alkaline, ≤50mA, approx. 30h continuous |
| Operating environment | -20 to 55°C, 20–80% RH |
| Size / weight | 285 × 85 × 56mm / 1.1kg |
Features
- Intrinsically safe: Ex ia IIB T3 Ga
- Clamp-on measurement, no stakes or disconnection needed
- 0.010–1200Ω with 0.001Ω resolution
- Threshold alarm and interference indicator
- 30 hours on AA batteries; 99-reading memory
Applications
Earthing checks at fuel depots, refineries, gas processing plants and chemical sites; hazardous-area electrical maintenance; lightning protection earthing in classified zones.