Continuous Monitoring for Sugar Solution Leaks in Boiler Feed Tanks

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Suger Solution Leak Monitoring
Sugar Solution Leak Monitoring 

In the past, the boiler feed tank systems in sugar factories had to be checked several times a day to make sure there were no sugar solution leaks. This was a very laborious process and, as continuous monitoring was not possible, monitoring results were not reliable. When a leak occurred, recovery operations were very costly and time-consuming.

With the FLXA202 and FLXA402 inductive conductivity analyzers, these are now problems of the past: both devices enable stable, continuous monitoring and the quick detection of sugar solution leaks, preventing serious problems from ever developing.


Expected Benefits

  • Automatically detect sugar solution leaks in sugar factories
  • Reduces operating costs

Process Overview

In sugar factories, crystallizers and concentrators produce a large amount of steam drain, which is reused as boiler feed water. However, sugar leaked during the boiler feed process can mix into this water. When that happens, the sugar can decompose into an organic acid at high temperatures, thereby decreasing the pH of the water. If the boiler operates with water at a low pH level, it can become corroded. The lowered pH needs to be raised to a normal level by performing a blowdown or the like, and the losses potentially caused by this process are not necessarily small. The sugar solution leak must be quickly detected before a minor problem turns into something much worse. For this reason, continuous monitoring is essential.

Solution Details

Measurement system

2-wire inductive conductivity system

Sensor: ISC40G(J)-GG-T1-☐☐
Transmitter: FLXA202-D-BーD-☐-C5-NN-A-N-LA-☐-NN
Dedicated distributor for transmitter: PH201G-A☐*B

4-wire inductive conductivity system

Sensor: ISC40G(J)-GG-T1-☐☐
Converter: FLXA402-A-B-☐-C5-NN-A2-WR-☐-☐-☐-NN

Field Data

Process conditions

Steam return line of crystallizer outlet

Measurement liquid: steam drain (plus sugar solution)
Monitoring range: 0 - 200 μS/cm
Temperature: approx. 80 °C
Alarm point: 100 µS/cm

(contact output can be used with the FLXA402)

Sugar Solution Leak Condition
Sugar Solution Leak Condition


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 63Hz
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 


As the contact output of the PH201G is always magnetically excited, it should be kept closed even when the power is turned off to perform maintenance.


  • 食品和饮料




  • 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.

  • Hot-Tap Holder PR10

    On-line measurements often present extra challenges, especially when routine maintenance is required. The PR10 is ideally suitable for applications where the sensors must be removed without interrupting or shutting down the process. Without any special tools the PR10 can be retracted safely from the process at pressures up to 5 bar (72 psi). Using the PR10 allows us to place any dissolved oxygen sensor that has a PG13.5 connenction into a retractable assembly.

  • ISC40/SC42高电导率传感器


  • ISC40百分比浓度传感器


  • 电导率传感器


  • 电导率分析仪



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