64 METTLER TOLEDO US and Canada

Sodi

um/S

ilica

Introduction Trace Contamination Measurement

Long-term efficient power generation requires careful surveillance to guard against corrosive and depositing conditions and to assure conformance with EPRI, VGB or other guidelines.

Our sodium and silica analyzers pro-vide highly sensitive monitoring of steam quality to prevent corrosion and deposition on turbines. These analyz-ers are also excellent for detecting con-denser leaks and condensate polisher breakthroughs.

Sodium AnalyzersThe Thornton 2300Na and 2301Na Sodium Analyzers offer a new design for a traditional measurement for pure water treatment and power cycle chem-istry monitoring, providing assurance of water purity to minimize corrosion. Early detection of trace contamination is enabled with minimal operator supervi-sion. The sample passes through an overflow assembly that assures precise pressure and flow regulation. The flow-rate is set by a needle valve and rota-meter at only 40 mL/min, saving pure water and reagent. DIPA vapor diffuses into the sample without contamination through gas-permeable tubing. The reagent raises the pH of the sample to approximately 11 pH to enable the ion-selective electrode to respond only to sodium ion concentration. The 2301Na Analyzer enables use of either DIPA or Ammonium hydroxide for this purpose. The sample passes through the sodium sensor flow tube and into

the larger flow chamber containing a combination probe including the refer-ence electrode, a pH electrode and temperature compensator. The pH measurement is always displayed, providing in-process confirmation that the correct amount of reagent has been added to the sample. The reference and temperature compensator are shared with the sodium measurement. The sample then passes to drain. Electrodes incorporate Intelligent Sen-sor Management™ capability which stores all identification, calibration, and real-time predictive maintenance data within the sensor.

Sodium and Silica MeasurementsReduce Corrosion and Deposition

2300Na Sodium AnalyzerThe 2300Na provides automatic, walk-away calibration with automatic sensor conditioning which saves time and assures reliable operation. A choice of enclosures are available to keep con-trols protected in dirty environments or conveniently accessible in clean areas.

2301Na Sodium AnalyzerThe 2301Na Sodium Analyzer offers a panel-mounted design with available feature options such as grab sample, filtration, and analyzer enclosure allow-ing the user to select those that best fit their need. The 2301Na also allows for either DIPA or ammonium hydroxide to be used as a reagent to comply with your plant operations and safety needs.

2300Na Sodium Analyzer

2301Na Sodium Analyzer

Measurement Range 0.001-100,000 ppb 0.01-100,000 ppb

Grab Sample Yes Add-on Option

Calibration Unattended, Automatic Manual

Automatic Na Sensor Conditioning Yes No

pH Check* Yes Yes

Low Electrode Etching Frequency Yes Yes

Low Reagent Consumption Yes Yes

Reagent Used DIPA DIPA or NH4OH

Accuracy ±10% of reading; ±0.05ppb DIPA

±10% of reading; ±0.1ppb DIPA

±10% of reading; ±0.1ppb NH4OH

Enclosure Fully enclosed, Full or Half Door models

Full enclosure or Panel assembly models

*pH Check assures reagent addition is taking place for interference- free measurement

65METTLER TOLEDO US and Canada

2800Si Silica AnalyzerThe Thornton 2800Si Silica Anaylzer is a reliable on-line instrument designed specifically for pure water treatment and power cycle chemistry monitoring. This Analyzer provides assurance of water purity to optimize ion exchange production of pure water and to minimize silica deposition in turbines. Early detection of trace contamina-tion is enabled with minimal operator supervision. The analyzer allows sample to pass through an overflow assembly ensuring that a fresh sample is available to start each measure-ment cycle. A rinse period purges the previous sample from the reaction/measurement chamber and fills it with the fresh sample. The measurement is zeroed. Then, reagents are metered in and reaction time allowed to produce a color change proportional to silica concentration. Where phosphates are present, an additional reagent is included to minimize interference. The measurement is made, the display and outputs are updated and the cycle repeats. The operator can configure the measurement interval to optimize the tradeoff of response time vs. rea-gent consumption. The 2800Si con-forms to ASTM Test Method D7126.

2300NaSodium Analyzer

2301NaSodium Analyzer

2800SiSilica Analyzer

70 METTLER TOLEDO US and Canada

SpecificationsMeasurements Range 0 – 5,000 ppbResolution 4 digits with decimal, autoranging; 0.01 ppb in lowest rangeLimit of detection 0.5 ppbAccuracy ± 5 % of reading ± 1 ppb, typicalMeasurement cycle time Adjustable, 20 min typical Reagent consumption approx. 4 L per 3 months with 20 min measurement cycle timeSample flowrate 200 – 250 mL / minSample temperature 5 – 60 °C (41 – 140 °F)Sample pressure 0.3 – 7 bar (5 – 100 psig)Zero calibration Automatic, every measurement cycleSpan calibration Automatic per schedule; once per month, typicalGrab sample measurement 1 L capacityOutputsAnalog output Powered 0/4-20 mA, 22 mA alarm, 500 ohm max load, not for use with externally powered circuitAnalog output accuracy ±0.05 mAAnalog output scaling Linear, bi-linear, logarithmic (1,2,3,4 decades), auto rangingRelay contacts two unpowered, SPDT, 250 VAC/30VDC, 3 A resistive freely assignable to setpoint for silica; other relays used for measure- ment and auto-cal

20.00”[508]

36.47”[926.3]

www.mt.com / Thornton

Silic

aSilica AnalyzerTrace Sensitivity

NEW! 2800SiHigh Sensitivity, Consistent Response

The METTLER TOLEDO Thornton 2800Si Silica Analyzer is a reliable on-line instrument designed specifically for pure water treatment and power cycle chemistry monitoring. This Analyzer provides assurance of water purity to optimize ion exchange in production of pure water and to minimize silica deposition in turbines. Early detection of trace con-tamination is enabled with minimal operator supervision.

Features/Benefits– Automatic, unattended calibration – provides excellent repeatability and saves operator time– Automatic zeroing with every measurement – assures measurement stability – Convenient grab sample capability – allows measurement of additional samples for QC checks in other areas of the plant– Simultaneous display of silica and measurement timing – provides convenient analyzer status at a glance, saving operator time– Analog output with choice of scaling – enables easy integration into data acquisition system– Full enclosure – safely protects reagent containers and components from plant environment– Large reagent containers enable a long service interval—reduces maintenance time

71METTLER TOLEDO US and Canada

Ordering InformationDescription Order No.2800Si Silica Analyzer 58 043 003Required Startup Kit for 2800Si 58 091 276Includes 3-month supply of dry reagents* and 1 L of 250 ppb silica calibration standard solution.

Service, Silica Analyzer Startup 58 092 332

Service, Spare Parts and AccessoriesStart Up Service-Sodium/Silica** 58 092 332Consumables, 6 months - dry reagents*, pump tubing, air filters, for measuring samples with 58 091 250phosphates. Eight liters of 10% sulfuric acid are also required to complete the reagent complementConsumables, 6 months - dry reagents*, pump tubing, air filters, for measuring samples without 58 091 251phosphates. Eight liters of 10% sulfuric acid are also required to complete the reagent complementSulfuric acid, 10% w/w, 10 L (used with dry reagents) 58 140 033***

Dry reagents* for samples with phosphates-3 month supply 58 091 252

Dry reagents* for samples without phosphates-3 month supply 58 091 253

Solution, 1 L of 250 ppb silica calibration verification standard 58 078 020(250 ppb as SiO2 using sodium silicate)Solution - 1 L of 500 ppb silica calibration/verification standard 58 078 021(500 ppb as SiO2 using sodium silicate)* Four liters of 10% sulfuric acid purchased in polymer container and 8 liters of deionized water are required to mix with dry reagents, sufficient for a 3 month period when operating continu-ously at 20 minutes per measurement.** METTLER TOLEDO strongly recommends that all silica analyzer quotes include startup service.*** Part number only available in the USA. In other countries consult your local METTLER TOLEDO pure water analytics representative for local sourcing.

Microelectr.

Power

� 39.9 mm (� 1.57")

� 38.1 mm (� 1.50")

� 17.7 mm (� 0.70")

� 20.5 mm (� 0.81")

� 20.5 mm (� 0.81")

304.8 mm (12.00")

25.4 mm (1.00")19 mm

(0.75")

50.8 mm (2.00")

82.55 mm (3.25")

128.7 mm (5.07")

49.7 mm (1.96")

52 mm (2.05")

42.4 mm (1.67")

Typical Applications– Ultrapure water monitoring at ppb silica levels can assure the highest

quality water is being delivered. Silica breakthrough of polisher anion resin is detected at very low ppb levels and contaminated water can be diverted before it reaches critical areas.

– Pure water treatment anion exchange monitoring detects the first break-through of silica to trigger regeneration before contamination reaches subsequent treatment stages.

– Power steam quality monitoring protects turbines from silica deposition and resulting imbalance, loss of capacity and efficiency. Silica meas-urement an control may also be needed to meet turbine manufacturer warranty requirements.

– Power condensate polisher monitoring can detect the need for regen-eration at low ppb levels before feedwater is significantly contaminated.

Bottom Dimensions

inches [mm]

Installation/Power/EnclosureOperator interface 4-line backlit LCD, 5 tactile keys; simultaneous display of silica concentration and measurement or auto-cal statusProcess connections Sample inlet: 1/4" or 6 mm OD tube SS compression fitting Drain hose: 19 × 25.4 mm (¾ × 1"), 2 m (6 ft) length includedPower 100-240 VAC, 50-60 Hz, 25 W; on power loss all settings are retained without batteriesDimensions HWD Enclosure: 927 × 508 × 305 mm (36.5" × 20.9" × 12")Weight 42 kg (93 lbs)Ambient operating temperature 10-50 °C (50-122 °F)Humidity 10-90 % non-condensing Ratings/approvals CE, cULus pending

*Specifications subject to change.