JCI 131 Adverse Conditions Fieldmeter

A ‘field mill’ type Electrostatic Fieldmeter for precise, high resolution, continuous measurement of electric fields in adverse environmental conditions.

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Including the JCI 131F fast response version



  • Enables long term external measurement of electrostatic fields
  • Durable stainless steel or brass case
  • High accuracy and designed to withstand direct precipitation
  • Can be used to determine ambient electric field
  • Can be used as a local potential probe
  • Fast response version can be used for field measurements near power lines.

General Description

The JCI 131 Electrostatic Fieldmeter is a compact and robust instrument for the precise measurement of electric fields in adverse environmental conditions. It is particularly suitable for long term continuous monitoring of atmospheric electric fields - such as those associated with thunderstorms, volcanic activity or power-lines.

Electric field measurement sensitivities of 2, 20, 200 and 2000 kV/m are provided with high precision (<1.5%), low noise and a stable zero. When used as a potential probe, well away from nearby structures, the sensitivity is about 10 kV/m for 1kV of local space potential, although critical applications should be underwritten by in-situ calibration.

The JCI 131 and JCI 131F (fast response version) of electrostatic fieldmeter may be used in conjunction with a JCI 234 Base Station which digitally displays the magnitude of the DC electric field at the sensing aperture and also displays the AC field component in the range 50-60Hz separately from the DC field component when used with the “F“ version for accurate measurement of electric fields near power lines.


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  • Sensitivity ranges:         2, 20, 200 and 2,000kV/m full scale
                                                Sensitivity selected automatically or by external control signals.
  • Accuracy & Linearity:    Within ±1.5%FSD of each operating range
  • Response:                        -3dB at about 3Hz for JCI 131, Response flat to 70Hz for JCI 131F
  • Environments:                 0-40°C, 0-100%RH including direct precipitation.


Accessories & Services

Compatible Instrument:                  

  • 100m Cable
  • JCI 137 Support Pole Assembly
  • JCI 152 Zero Check Chamber
  • Calibration in general accordance with BS7506:
    Part 2:1996
  • Operational Health monitoring options also available
    depending on requirements



Library items

JCI Electrostatic Instrumentation Brochure 2014

Our latest range of JCI electrostatic instruments and services for the consultancy, laboratory testing, hazard assessment, R&D and training sectors.

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Practical Guide to Industrial Electrostatics - Hazards, Problems & Applications

The reason why electrostatic phenomena are so important can be set under three headings: hazards, problems and applications. This Guide will address each of these in turn and show why static often has a critical role to play across the whole breadth of industry.

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