QL3550 Online TOC analyzer

Measuring method:

• 1) When the QL3550 total organic carbon analyzer uses pure oxygen as carrier gas, it uses a combined oxidation method of UV persulfate and hydroxyl radicals to oxidize organic substances in water, and measures the carbon dioxide concentration with NDIR, thereby completing the determination of total organic carbon in water.

• 2) When the QL3550 total organic carbon analyzer uses instrument air as carrier gas, it uses the UV persulfate oxidation method to oxidize organic substances in water, and measures the carbon dioxide concentration with NDIR, thereby completing the determination of total organic carbon in water.

Instrument features:

• 1) The QL3550 total organic carbon analyzer accurately measures low-concentration TOC and can be widely used for the determination of total organic carbon in reverse osmosis water, condensate, makeup water, and other applications in industrial sectors such as electronics and power.

• 2) The TOC analyzer has dual ranges with automatic switching, high accuracy, and can detect TOC concentrations as low as ppb level.

• 3) The total organic carbon TOC analyzer has low maintenance requirements/costs: 4 mm inner diameter sample line, built-in flow cell, no sample pretreatment required, saving pretreatment costs.

• 4) The total organic carbon determination process does not use alkaline reagents, eliminating measurement interference caused by carbon dioxide dissolving into alkaline reagents, and effectively reducing the difficulty for operators to prepare reagents.

• 5) Friendly human-machine interface: The total organic carbon TOC analyzer is equipped with a high-definition touchscreen, convenient data download and software updates, and a multi-level management mode for convenient instrument management by users.

Technical specifications

• Measuring parameter    Total organic carbon (TOC) = non-purgeable organic carbon NPOC

• Oxidation method    Combined oxidation method of UV persulfate and hydroxyl radicals – when pure oxygen is used as carrier gas

• UV persulfate oxidation method – when instrument air is used as carrier gas

• Measuring method    After the water sample is oxidized, the carbon dioxide concentration is measured by NDIR

• Sample introduction requirements    Flow rate: ≥100mL/min

• Particle size: ≤1.5mm, soft particles

• Sample introduction pressure: ≤1bar

• Water sample temperature    5oC – 45oC

• Carrier gas    Oxygen: (using oxygen generator)

• Power supply voltage and frequency : 220V AC/50Hz(±10%)

• Oxygen concentration : >92%

• Pressure : >0.05MPa

• Oxygen consumption flow rate: maximum 1.7L/min

• Carbon dioxide-removed instrument air:

• Source pressure: 50~120PSIG

• Dew point : -20℃ (remove moisture and oil vapor)

• Instrument gas consumption flow rate: maximum 1.7L/min

• Measuring range    0-100 ~ 0-2000 μgC/L

• Analysis time    5.5 minutes (0-100 μgC/L )；7 minutes (0-2000 μgC/L)

• Measuring interval    Adjustable (in minutes)

• Repeatability    ±10 μgC/L or ±2% of reading (whichever is greater)

• Accuracy    ±10 μgC/L or ±3% of reading (whichever is greater)

• Lowest detection limit    10 μgC/L

• Protection class    IP44

• Signal transmission    0/4-20 mA, maximum load 500 Ω

• Digital output    Modbus/RTU RS485

• Relay output    Four relays (24 V 2A, dry contact)

• Power supply    100 - 240V, 50/60Hz

• Display    7-inch, 800 × 480 pixels (4:3) TFT-LCD touchscreen

• Data storage    9999 analysis data records, 99 fault messages

• Dimensions    1100 x 560 x 370 mm

• Weight    65 Kg

Ordering guide

• Main unit

• 8653700    QL3550 online total organic carbon analyzer, 0-100ppb, 0-2000ppb

• Required accessories (choose one)

• 8663500    Oxygen generator

• 9781800    Pressure-reducing filter

• Other accessories and spare parts

• 8653600    NDIR carbon dioxide detector 343

• 8662200    Pressureless regulating valve

• 9789900    QL3550 annual maintenance kit

• 8654000    Circulation pump dedicated tubing kit

• 8654100    Peristaltic pump tubing kit

Source: Public information from the HACH water quality website