Measuring Concentrations of Developing Solutions and Fluoric Acid

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In a semiconductor plant, a variety of chemicals are used in various manufacturing processes. The chemicals used for specific purposes are produced by diluting raw liquid with demineralized water using in diluting equipment, and the control of the concentration at this point is performed by conductivity measurement. The FLXA202 and FLXA402 Inductive Conductivity Analyzer are capable of high-precision measurement, and their toroidal probe ISC40 is sealed in rugged PEEK (Poly Ether Ether Ketone) material to withstand the harshest applications. A highly reliable measurement is achieved by using FLXA202/FLXA402 in the control of concentrations of chemicals in a dilution system. The FLXA202 and FLXA402 Inductive Conductivity Analyzer also play a role in the drainage control and the processing of solutions delivered from various manufacturing processes.

Dilution System Diagram

Dilution System Diagram

Expected Benefits

  • Easy control of fluoric acid concentration
  • Reduces operating costs
  • Establishment of corrosion-resistant wetted parts

Process Overview

Up to now, chemicals used in semiconductor plants have been purchased in concentrations diluted beforehand by the chemical company to suit specific applications. However, as the price competition in the semiconductor market is increased, the operating cost reduction is highly required. As a result, each chemical used in a manufacturing process has been reviewed so that the substance profits and widespread cost reductions are secured.

Ordering chemicals in various concentrations from chemical manufacturing companies has been replaced by the installation of dilution systems at individual companies, whereby a raw chemical solution, whose price is not significantly different from that of diluted chemicals, is diluted to the required concentration, using inexpensive demineralized water.

Solution Details

Measurement system
2-wire inductive conductivity system
Sensor ISC40G(J)-GG-T1-X☐/Z Z: Teflon coating
Flow-through type holder ISC40FF(J)-PJ/Z Z: Teflon coating
Analyzer FLXA202-D-BーD-AB-C5-NN-A-N-LA-☐-NN
Dedicated distributor for transmitter PH201G-A☐*B
4-wire inductive conductivity system
Sensor ISC40G(J)-GG-T1-☐☐/Z Z: Teflon coating
Flow-through type holder ISC40FF(J)-PJ/Z Z: Teflon coating
Converter FLXA402-A-B-□-C5-NN-A2-WR-☐-☐-☐-NN

Field Data

Measurement Examples

Measurement Examples


FLXA202 inductive conductivity transmitter
Power supply voltage: 17 - 40 V DC (from distributor)
PH201G distributor
Power supply: 100 V: 20 to130 V DC/80 to 138 V AC, 47 to 63 Hz
220 V: 120 to 340 V DC/138 to 264 V AC, 47 to 63 Hz
Power consumption: 24 V DC: approx. 200 mA
100 V AC: approx. 7 VA
220 V AC: approx. 11 VA
FLXA402 inductive conductivity converter
Power supply: 90 to 264 V AC, 50/60 Hz
Power consumption: 35 VA maximum


  • 2-Wire Transmitter/Analyzer FLXA202

    The FLEXA™ series analyzers are used for continuous on-line measurements in industrial installations. With an option for single or dual sensor measurement, they are the most flexible two-wire analyzer available.

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