Introduction
Seawater leak detection is one of the post-condensation water quality management processes that are performed for power station boilers and similar facilities. Damage to the ion exchange resin, which deionizes the supplied water, is also monitored during this process, and both of these applications are executed by a conductivity analyzer.
Expected Benefits
- Detects seawater leakage and ion exchange resin damage
- Reduces operating cost
Process Overview
Boiler Water Quality Management Process
The above illustration shows where analyzers are used in the boiler water quality management process.
In the measurement point 
shown in the figure, two different signal ranges are needed for deionized water management and seawater leak detection. The FLXA402 can simultaneously generate output signals for two different ranges, meaning that a single unit can perform deionized water management concurrently with seawater leak detection.
Other applications for this conductivity analyzer include the management of deionized boiler water.
Solution Details
| Measurement system | 4-wire conductivity system |
|---|---|
| Converter | FLXA402-A-B-☐-C1-NN-A2-WR-☐-☐-☐-NN |
| Sensor | SC4A(J)-S-AD-09-002-☐☐-T1/PS |
| General Specifications | |
| FLXA402 4-wire Conductivity Converter | |
| Measuring range (at process temperature; C: cell constant) | |
| [Conductivity] | Minimum: 0 µ/cm |
| Maximum: 200 mS/cm x C (overrange: 2000 mS/cm) | |
| [Resistivity] | Minimum: 0.005 kΩ/C |
| Maximum: 1000 MΩ·cm | |
| [Temperature] | Pt1000: -20 to +250°C |
| Output setting range | |
| [Conductivity] | Minimum: 0.010 µS/cm |
| Maximum: 2000 mS/cm | |
| [Resistivity] | Minimum: 0.001 kΩ·cm |
| Maximum: 1000 MΩ·cm | |
| [Temperature] | Min. span: 25°C; Max. span: 270°C |
| Output signal: | two or four outputs of 4-20 mA DC + HART |
| Construction: | for outdoor installation, IP66, NEMA Type4X waterproof |
| Ambient operating temperature: | -20 to +55°C |
| Power supply voltage: | 90 to 264 V AC, 50/60 Hz |
| Power consumption: | 35 VA maximum |
| SC4A(J) Conductivity Sensor | |
| Electrode system: | two-electrode system |
| Cell constant: | 0.02 cm-1 |
| Measuring range: | 0 – 0.5 µS/cm to 0 – 200 µS/cm |
| Temperature range: | 0 - 110°C |
| Wetted material: | SUS316L, PEEK (polyether ether ketone) /PS Adapter (option code of SC4A(J)) |
| Material: | SUS316L |
| Operating pressure: | 1 MPa maximum (depends on the SC4A(J) Sensor) |
Industries
-
Cogeneration
Cogeneration or combined heat and power (CHP) is an efficient approach to generating power and thermal energy from a single fuel source.
-
Combined Cycle
The combined cycle power plant is being installed in increasing numbers around the world where there are substantial supplies of natural gas.
-
Power
In the mid 1970s, Yokogawa entered the power business with the release of the EBS Electric Control System. Since then, Yokogawa has steadfastly continued with the development of our technologies and capabilities for providing the best services and solutions to our customers worldwide.
Yokogawa has operated the global power solutions network to play a more active role in the dynamic global power market. This has allowed closer teamwork within Yokogawa, bringing together our global resources and industry know-how. Yokogawa's power industry experts work together to bring each customer the solution that best suits their sophisticated requirements.
-
Thermal
Thermal power using coal, oil or gas as fuel accounts for the majority of electric generation throughout the world.
Related Products & Solutions
-
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.
-
2-Wire Transmitter/Analyzer FLXA21
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.
-
Contacting Conductivity Sensors SC42/SC4A(J)
The measurement of specific conductivity in aqueous solutions is becoming increasingly important for the determination of impurities in water. Yokogawa has designed a full range of precision sensors and instruments to cope with these measurements, even under extreme conditions.