QL3580M Online TOC analyzer

Measuring method

• 1. The water sample enters the reactor and reacts with acid, at which point the inorganic carbon in the water sample is converted into carbon dioxide;

• 2. Using carbon dioxide-free air (pure oxygen) as the carrier gas, the carbon dioxide converted from inorganic carbon is purged out, and at this point the total inorganic carbon (TIC) can be measured by detection with an NDIR detector;

• 3. The water sample from which TIC (total inorganic carbon) has been removed is then oxidized;

• 4. After oxidation is complete, the carbon dioxide converted from organic carbon is purged out by the carrier gas and detected by the NDIR detector to obtain the total organic carbon (TOC) content.

Instrument features

• Adopts an oxidation method combining UV persulfate and hydroxyl radicals, resulting in higher oxidation efficiency and high accuracy even at low concentrations

• Adopts a sample inlet line with a 4 mm inner diameter, allowing passage of soft particles up to 2 mm in diameter, and comes with a built-in flow cell, so routine samples require no filtration

• The two-point automatic calibration function reduces additional maintenance workload for operators, and sequential batch measurement reduces reagent consumption.

• The analysis process does not use alkaline reagents, effectively reducing the difficulty for operators to prepare reagents and eliminating measurement interference caused by carbon dioxide dissolving into alkaline reagents

• Low maintenance workload, low maintenance cost

• Friendly human-machine interface: equipped with a high-definition touchscreen, featuring a user-friendly operating interface and instrument interfaces, enabling quick and convenient data download and software updates, and a multi-level management mode for convenient instrument management by users

Technical specifications

• Measuring parameters    TOC (NPOC)/TIC

• Oxidation method    Oxidation method combining UV persulfate and hydroxyl radicals

• Measuring method    After the water sample is oxidized, the carbon dioxide concentration is measured with an NDIR detector

• Measuring range    0-10 mg/L

• Minimum detection limit    0.05 mg/L

• Repeatability    ±2% of reading or ±0.05 mg/L (whichever is greater)

• Accuracy    ±3% of reading or ±0.05 mg/L (whichever is greater)

• Zero drift    Within ±2%f.s./day

• Span drift    Within ±2%f.s./day

• Analysis time    7 minutes (TOC)

• Measuring interval    Adjustable (in minutes)

• Interference    Possible turbidity, fat, oil, protein, and tar may interfere with the measurement results

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

• Particle size: ≤2 mm, soft particles

• Sample inlet pressure: ≤1 bar

• Carrier gas (oxygen)    Oxygen generator: power supply voltage and frequency: 220V AC/50Hz (±10%)

• Oxygen concentration: >92%

• Pressure: >0.05 Mpa

• Oxygen consumption flow rate: maximum 1.7L/min

• Water sample temperature    5℃– 45℃

• Maintenance interval    Once every 3 months

• Protection class    IP44

• Signal output    0/4~20 mA, Modbus/RTU RS485

• Relay output    4 relays (24v 2A, dry contact)

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

• Data storage    9999 analysis data records, 99 fault messages

• Power supply    100 – 240 V AC, 50/60Hz

• Dimensions    1100 x 560 x 370 mm

• Weight    65 Kg

Ordering information

Main unit

8653100    QL3580M online total organic carbon analyzer

Accessories

• 8663500    Oxygen generator

• Other spare parts and annual maintenance kit

• 8651700    QL3580M annual maintenance kit

• 8651000    NDIR carbon dioxide detector 343

• 9789600    Circulation pump dedicated tubing kit

• 8654000    Peristaltic pump tubing kit

Source: Public information from the HACH water quality website