Swan AMI Soditrace Trace Sodium Analyzer for Condensate and High-Purity Water

Sodium at parts-per-trillion level for ultra-pure water

The Swan AMI Soditrace measures sodium ions in the trace range in condensate and high-purity water. The manual states that sodium measurement is used for quality control in high-purity water applications and to monitor breakthrough of ion exchangers. The swan.ch page lists power, semiconductor and nuclear applications and a lowest detection limit of 0.001 ppb (1 ppt).

It is a complete system with transmitter, sensors, flow cell, pH-controlled reagent dosing and a device for automatic calibration and sensor regeneration, all on a stainless steel mounting plate. The measurement uses a glass ion-sensitive electrode, and sodium readings below 1 ppb need a special glass formulation for the sensing electrode.

Technical specifications

Values are from the Operator’s Manual A-96.250.551 (section 2.2) and the swan.ch product page.

Reagent conditioning and automatic care

A measuring limit of 0.001 ppb needs the sample conditioned to at least pH 12 while keeping sample integrity, and the best results are obtained with diisopropylamine (DIPA). An air pump carries reagent vapor to an air lift pump, and a conductivity sensor measures the amount of reagent added. A PID controller switches a valve to hold the conductivity at 450 uS/cm for low sodium readings, and a fall below the set point raises an error when the reagent is exhausted.

The system regenerates the sodium electrode automatically at a programmed interval, or 12 hours before a calibration, by etching it with a regeneration solution. Calibration is a three-point procedure in which a measured volume of standard, about 500 times smaller than the sample volume, is added to a closed loop and the reading is allowed to stabilize.

What to confirm before ordering

The sample must meet the stated limits: pH of at least 7, ammonium below 10 ppm and clean, oil-free water. Plan for a DIPA reagent bottle, sodium standard solution, regeneration solution and reference electrolyte, which are consumables. The unit is for indoor mounting and the installation steps include a 24 hour run-in period.

Panel dimensions are given as 860 mm in the text but 850 mm in the drawing of the manual, so the drawing should be requested for mounting. State AC or DC supply and communication options in the enquiry.

How the Swan AMI Soditrace works

The AMI Soditrace measures sodium with a glass electrode that responds to sodium ions. A small stream of sample passes through a flow cell, where it meets the sodium electrode and a calomel reference electrode. The sample is first raised to a high pH by adding a reagent vapor, so that hydrogen ions do not disturb the reading. The voltage between the electrodes is converted to a sodium value. A conductivity sensor checks that the right amount of reagent has been added.

Where the Swan AMI Soditrace is used

• Power plant condensate
• Boiler feed water
• Semiconductor high-purity water
• Nuclear plant water
• Ion exchanger breakthrough monitoring

Selection checklist for the Swan AMI Soditrace

• Measuring range from 0.001 to 10 ppb
• Sample flow of at least 100 ml/min
• Sample temperature of 5 to 45 degrees C
• Inlet pressure of 0.3 to 3 bar
• Reagent supply for conditioning
• Power: AC or DC supply
• Panel weight of 13 kg
• Calibration and regeneration needs

Installation, commissioning and maintenance notes for the AMI Soditrace

Mount the panel on a wall in a clean spot. Connect the sample line to the inlet and the drain to the outlet, keeping the outlet free of pressure. Fill the reagent bottle and connect the power. Allow the electrodes to settle, then calibrate. Replace the electrodes and the reagent on the interval in the manual, and watch the alarms.

Requesting a quotation for the Swan AMI Soditrace

Please send the sample type, the range needed, the power supply and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

AMI Soditrace accuracy

The product page gives accuracy of plus or minus 0.005 ppb or 10 percent of reading, and reproducibility of plus or minus 0.001 ppb or 5 percent.

AMI Soditrace response time

The response time is 120 s to 90 percent of the final value.

AMI Soditrace sample quality

The sample should have pH 7.0 or higher, with no oil or grease, and ammonium below 10 ppm.

AMI Soditrace power and transmitter

Power is 100 to 240 VAC or 10 to 36 VDC, up to 35 VA. The transmitter has an IP66 case and a backlit display.

Analyser records for the AMI Soditrace

Keep calibration results, electrode dates and reagent batches with the plant record.

Choosing the right AMI Soditrace setup

Choose the reagent route from the lowest sodium level you must measure.

Documents and quotation

The attached Swan Operator’s Manual A-96.250.551 (firmware V6.20 and higher) and the swan.ch product page are the sources for this page. Seven Star LLC supplies Swan products as an independent supplier in Muscat. Give the supply type, options and quantity when you enquire. Further analyzers are collected under liquid analytical systems.