Dual-Channel Conductivity Analyzer

Model Code FLXA21 FLXA202 DC402G
Area Classification
  • General Purpose
  • Class I Div II (without the use of IS Barrier)
  • Class I Div I (with the use of IS Barrier)
  • General Purpose
  • Class I Div II (without the use of IS Barrier)*FM/CSA Pending
  • Class I Div I (with the use of IS Barrier)*FM/CSA Pending
  • General Purpose
  • Class I Div II
Enclosure Material Plastic (Polycarbonate) Aluminum alloy die cast with epoxy coating (Standard offering)
Aluminum alloy die cast with urethane or high anti corrosion coating (available upon request)
Cast Aluminum with chemically resistance coating; polycarbonate cover with polycarbonate flexible window
Housing Rating IP66/ NEMA 4A/ CSA 3S IP66 (except Canada), Type 4X (except Canada), Type 3S/4X (Canada) IP66/ NEMA 4A/ CSA 3S
Power Supply 2-wire 24VDC, Loop Powered 2-wire 24VDC, Loop Powered 4-Wire 110-256 VAC, Mains Power
Output Signal Bi-directional HART digital communication, superimposed on mA (4-20mA) signal. Bi-directional HART digital communication, superimposed on mA (4-20mA) signal. Two isolated outputs of 4 to 20 mA DC with common negative.

The model FLEXA™ two-wire analyzer is used for continuous on-line measurements in industrial installations. It offers an option for single or dual sensor measurement, making it the most flexible 2-wire analyzer available. The model FLEXA™ modular-designed series analyzer.

  • One analyzer can accept any of 4 types of measurements; pH/ORP, Contacting Conductivity (SC), Inductive Conductivity (ISC) and Dissolved Oxygen (DO)
  • Dual sensor measurement on a 2-wire type analyzer pH/ORP and pH/ORP, SC and SC, and DO and DO
  • Modular design: replaceable sensor modules
  • Redundant system on dual sensor measurement
  • Variety of materials of construction: SS or Plastic
  • Intuitive easy touch screen operation on 2-wire type analyzer
  • Unique HMI menu structure in 12 languages
  • Quick setup menu for fast and east measurement operation
  • Online Sensor Wellness checking for predictive maintenance
  • NEMA 4X / IP66 Enclosure
Input Specification

Two or four electrode measurement with square wave excitation, using max. 60 m cable and cell constants from 0.005 to 50.0 cm-1

Input Range Conductivity: 0 to 2000 mS/cm at 25ºC (77°F) 
Temperature: -20 to 140ºC (0 to 280°F)  
Conductivity 2 µS x K cm-1 to 200 mS x K cm-1
Accuracy:  ±0.5% F.S. 
 1 µS x K cm-1 to 2 µS x K cm-1     
Accuracy:  ±1% F.S. 
Resistivity 0.005kΩ/ K cm-1 to 0.5MΩ/ K cm-1
Accuracy:  ±0.5% F.S.
0.5MΩ/ x K cm-1 to 1MΩ/ x K cm-1
  Accuracy:  ±1% F.S. 
Temperature with Pt1000, Pb36, Ni 100
     Accuracy: ± 0.3ºC
with Pt100, NTC 8k55
      Accuracy: ± 0.4ºC
Step Response ≤7 seconds for 90% (for a 2 decade step)
Cable Length Max 60 meters (200 feet). 10 meters (35 feets0 fixed sensor cable + 50 meters (165 feet) WF10 extension cable
Transmission Signal Bi-directional HART digital communication, superimposed on mA (4-20 mA) signal
Temperature Compensation Automatic or manual, for temperature ranges.
Reference temp. programmable from 0-100°C or 30-210°F (default 25°C) 
Calibration Semi-automatic calibration using pre-configured OIML (KCl) standard tables, with automatic stability check. Manual adjustment to grab sample.
Display Black and white, 213 x 160 pixels LCD with a touch screen
Housing IP66/ NEMA 4A/ CSA 3S
IP66 (except Canada), Type 4X (except Canada), Type 3S/4X (Canada)
Environment Ambient Temperature: -20  to 55°C
Humidity: 10 to 90% RH at 40°C (non-condensing)
 Power Supply Ratings; 17 to 40 V DC 

Flexibility, reliability and low maintenance are among the benefits provided by the EXA DC402G conductivity analyzer. Designed to meet the exacting requirements of measuring dual cell conductivity and resistivity in the modern industrial environment, it contains many features to ensure the best precision whatever the application. Differential, ratio, deviation. % passage or % rejection can be indicated and/or transmitted. 

This 4-wire converter is housed in a robust IP65 field mountable case. Two mA outputs, four relays, digital communication and a clear LCD make the DC402G a truly comprehensive package. 

The DC402G features PI control on the auxilliary mA output and the pulse proportional relay outputs, thus avoiding the need for a separate controller.

The famous EXA sensor diagnostics are also present in the DC402G. Self-tuning of the excitation frequency and measuring pulses ensure optimum accuracy. The polarisation check gives on line indication of sensor fouling and early warning that maintenance is needed. A wide variety of temperature compensation possibilities (NaCl according to IEC 746-3, manual TC, preprogrammed matrices and a freely programmable 5x5 matrix), provides a high-accuracy measurement with minimum effort.

  • Differential, ratio or calculated outputs
  • Universal conductivity/resistivity, software switchable
  • On-line sensor checking
  • Self-tuning measuring signal
  • Matrix temperature compensation for pure water applications
  • Four fully configurable SPDT contact outputs
  • Two fully configurable mA outputs
  • Built-in PI controller
  • Easy to use EXA control panel
  • USP 23 monitoring
Application Note

Ion Exchange is a method for the exchange of ions between two electrolytes or between an electrolyte solution and a complex molecule. In most cases the term is used to denote the processes of purification, separation, and decontamination of aqueous and other ion-containing solutions with solid polymeric or mineralic ion exchangers.


Measurement and control of Heat Exchanger Leakage can help prevent costly maintenance, repair and downtime. The simple, essentially maintenance-free measurement of condensate conductivity will give the operator information necessary (or provide automatic control) to prevent severe damage to the boiler should a breakthrough of the heat exchanger occur.

Application Note

United States Pharmacopoeia (USP) is the governing body responsible for issuing guidelines for the pharmaceutical industry. Implementing these guidelines is required for companies that bring drugs to the US market. This means that USP is important to all pharmaceutical companies, period.

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