ET131  Configurable C4D Detector/Monitor Headstage

ET131 Configurable C4D Detector/Monitor Headstage
ET131 Configurable C4D Detector/Monitor Headstage
  • Fully factory-configurable by selection of electrode dimentions, tubing sizes and converter gain
  • Conductivity ranges available: 20 µS/cm to 200 mS/cm Full scale
Unit Price: $ (USD) 740.00


The ET131 can be used to record the conductivity of a solution flowing through tubing. It is fully factory-configurable to meet the customer’s defined applications. The customer should specify the desired conductivity range, tubing dimensions and the nature of the experiment. Typical conductivity ranges can be chosen from 20 µS/cm to 200 mS/cm Full scale.

The following parameters can be specified to suit an application:

  • The outer diameter of the tubing: between 360 µm and 3200 µm.
  • Inner diameters: between 50 µm and 1600 µm.
  • Electrode gap: 3 or 10 mm. Select a large gap to measure high conductivities or a small gap for better resolution.

Installation is easy as the customer’s tubing is simply slid into the headstage. The ET131 must be connected to either the ER225, ER815 or ER825 hardware units.

The sample doesn't come into contact with the detector electrodes so it's easy to analyse hazardous, corrosive or radioactive liquids. There is no carryover or memory effect from the previous sample. There is no electrode deterioration or polarization.

The ET131 applications include:

  • Recording the very low conductivity of polar ice meltwater by Continuous Flow Analysis.
  • Measuring liquid-liquid slug flow properties in tubing.
  • Measuring total dissolved inorganic carbon concentration at different depths in the sea with an autonomous ocean profiling vehicle.
  • As a contactless conductivity meter.

The ET131 is in the same family as the:

  • ET125 General Purpose C4D Monitor Headstage.
  • ET130 IC/HPLC C4D Detector Headstage.

Research Areas

Application Notes


  • Quantitative Characterisation of Conductive Fibers by Capacitive Coupling.  Andres Ruland, Rouhollah Jalili, Attila J. Mozer, and Gordon G. Wallace.  Analyst, 2017.  DOI: 10.1039/C7AN00442G
  • Suspension Catalysis in Slug Flow Microreactor – Experimental and Numerical Investigation of Mass Transfer.  Frederik Scheiff, Frank Neemann, Sylwia J. Tomasiak, Prof. David W. Agar.  Chemie Ingenieur Technik, 86, 4, 504–518, 2014.  DOI: 10.1002/cite.201300131
  • Exploring the possibilities of capacitively coupled contactless conductivity detection in combination with liquid chromatography for the analysis of polar compounds using aminoglycosides as test case. Péter Jankovicsa, Shruti Chopraa, Mohamed N. El-Attuga, Deirdre Cabootera, Kris Wolfsa, Béla Noszálb, Ann Van Schepdaela, Erwin Adams.  Journal of Pharmaceutical and Biomedical Analysis.  2014. DOI: 10.1016/j.jpba.2014.12.015
  • Contactless Conductivity: An HPLC Method to Analyze Degree of Methylation of Pectin.  Gary A. Luzio, and Randall Cameron. Proceedings of the Florida State Horticultural Society, 123, 213–216. 2010.


Photos[ click on the thumbnails below to view large images ]

ET125-130-131 no cable ET125-130-131 with ruler length ET125-130-131 with ruler width ET125-130-131 no cable


A procedure for C4D analysis in PowerChrom software
The C4D Profiler in PowerChrom software to optimise C4D settings

View more related videos on the Screencast Training Videos Wiki

  • Electrode ID: factory-configurable between 360 and 3200 µm
  • Electrode Gap: factory-configurable 3 or 10 mm
  • Variable excitation in frequency and amplitude
  • Factory adjustable gain
  • Conductivity ranges available:
    200 mS/cm to 2mS/cm - resolution 200μS/cm
    20 mS/cm to 200μS/cm - resolution 20μS/cm
    2 mS/cm to 20μS/cm - resolution 2μS/cm
    200μS/cm to 2μS/cm- resolution 200nS/cm
    20μS/cm to 200nS/cm - resolution 20nS/cm


© copyright 2002 - 2024   eDAQ - data recording made simple
       website by frogwebworks
© copyright 2002 - 2024   eDAQ - data recording made simple
website by frogwebworks
© copyright 2002 - 2024 eDAQ - data recording made simple website by frogwebworks
© copyright 2002 - 2024 eDAQ - data recording made simple
website by frogwebworks