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Red rectangular ETCR 2900B earth resistance detector with LCD screen

ETCR

ETCR 2900B Earth Resistance Online Detector 0.01-2000Ω GPRS electrician tool

SKU CH-6Q4G-B1E0G MPN 2900B

Measures earth resistance from .01 to 2000 Ω with GPRS and RS485 communication for continuous online monitoring

  • Labor warranty1 Year
  • Product typeTest Equipment
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Monitors grounding resistance online from 0.01 Ω to 2000 Ω
  • Tracks grounding voltage in real time with average-value rectification
  • Communicates via RS485 and GPRS for remote data access
  • Sets automatic monitoring intervals from 1 to 999 hours
  • Delivers over 10000 measurements on a 128 mm × 75 mm LCD

Online Ground Resistance Monitor

The ETCR 2900B is a fixed-installation detector that continuously measures earth resistance from 0.01 Ω to 2000 Ω and grounding voltage. It uses a 128 mm by 75 mm LCD to display real-time readings and stores over 10000 measurement records. Data is transmitted via RS485 or GPRS for remote supervision.

Facilities needing permanent grounding oversight

Electrical substations, telecom towers and industrial plants that require unattended, round-the-clock monitoring of their earthing systems will benefit from the automatic 1 to 999 hour interval setting. Sites without cellular coverage or a wired RS485 backbone cannot use the communication features and should consider a local-display-only instrument.

Measurement range 0.01 Ω to 2000 Ω

This span determines whether the detector can verify the low-resistance earths demanded by high-voltage protection schemes or the higher values found in lightning-protection networks. If your specification calls for a range outside these limits, the 2900B will not meet the requirement.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $233.99
Pricier than about 82% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameETCR
Model name2900B
Product typeTest Equipment
Color and finishRed
In the box
Number of items1 pack

Questions about this item

What mounting space does the 128 mm by 75 mm LCD require?

The detector’s display measures 128 mm wide by 75 mm high, so allow at least that clear panel cut-out plus clearance for the housing and cable glands.

Which wiring mistake do installers make when connecting the RS485 or GPRS links?

Reversing the RS485 A and B lines is the most common error; verify polarity against the terminal labels before sealing the enclosure.

When should the auxiliary earth spikes used for the 3-wire test be replaced?

Replace the spikes once their tips become corroded or bent, as worn spikes raise contact resistance and skew readings across the 0.01 Ω to 2000 Ω range.

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