Model 6400T

Sulfur Dioxide Analyzer​​​​


The 6400T Series analyzers uses a proven UV fluorescence principle coupled with state-of-the-art microprocessor technology to provide accurate and dependable measurements of low level SO2. The 6400T-H2S measures hydrogen sulfide (H2S) by incorporating a catalytic convert​er set at 600°F (315°C) to oxidize H2S into SO2 while leaving other more difficult to oxidize sulfurs unconverted. A switching mode allows analysis of both H2S and SO2 concurrently.

Advanced Performance

The 6400T series analyzers offer an advanced color display, capacitive touch screen, intuitive user interface, flexible I/O and built-in data acquisition capability. It includes a built-in data acquisition capability using the analyzer’s own internal memory. This allows the logging of multiple parameters, including averaged or instantaneous concentration values, calibration data and operating parameters, such as flow, pressure and lamp intensity. The analyzers combine lighter weight, rugged construction, ease of use, powerful diagnostics, modular design and outstanding performance to meet air monitoring requirements.

Stored data is easily retrieved through the front panel or via RS-232, Ethernet or USB ports either locally or by remote connection using the included APIcom™ software. These innovative features allow operators to perform predictive diagnostics and enhanced data analysis by tracking parameter trends. 

Optional Equipment

  • Rack mount brackets (19”) with chassis slides

  • Rack mount brackets only

  • RS-232 cable

  • Expendables kit

  • Spare parts kit

  • Multi-drop RS-232 connection

  • Ethernet port includes 7ft. CAT-5 cable (disables one serial port)

  • Nitric oxide optical filter (recommended for high NOx applications)

  • Concentration alarm relays

  • Calibration options:

    • Ambient zero and ambient span

    • Zero scrubber and pressurized span

    • Zero scrubber and internal span sources (IZS)


  • Selectable voltage

  • Internal pump

  • Auto ranging and dual ranges

  • 47mm diameter particulate filter

  • 8 isolated digital status outputs

  • Dual bi-directional RS-232

  • Specified AC voltage and frequency: (100V-115V or 220-240V, 50Hz or 60 Hz)

  • Up to 4 analog outputs: 4-mA (3 max) or settable DC voltage (0-10V, 0-5V, 0-1V, 0-0.1V)​


  • Ranges of 0-50 ppb to 0-20 ppm SO2 (user-selectable), one or two ranges with auto-ranging capability

  • UV-Fluorescence technology

  • Reliable Photo-Multiplier Tube (PMT) detector

  • In-line particulate filter included

  • Large, luminescent touch-screen display with easy-to-view ranges with auto-ranging capability  characters

  • Integral vacuum pump to draw sample

  • Menu-driven functionality and numerous parameters detected with microprocessor-based functionality

  • Front-panel accessible USB ports for firmware upgrades as standard

  • Up to 4 analog outputs, 4-20 mA (isolated) or settable voltage type (0-100 mV, 0-1V, 0-5V, 0-10V)

  • Ethernet and 2 x RS-232 digital outputs (optional USB, RS-485 or multidrop RS-232 available)

  • 8 x opto-isolated digital outputs and 6 x opto-isolated digital inputs

  • Power: 110 VAC or 220 VAC, 50 or 60 Hz (user to specify)

  • Fittings, ¼" SS (6mm optional)

  • 19" Rack mount with ears​



​H2S and SO2 Analyzer


​Min:    0-50 ppb H2S
            0-50 ppb SO2 full scale
Max:   0-10,000 ppb H2S
            0-20,000 ppb SO2 full scale
            (user selectable, dual ranges and auto ​ranging supported)


​Zero:    < 0.2 ppb (RMS)
Span:   < 0.5% of reading (RMS) above 50 ppb


​Zero:    < 0.5 ppb of FS/24 hours
Span:   < 0.5% of FS/24 hours


​Lag:           20 seconds
Rise/Fall:  < 120 seconds to 95% FS


​1% of full scale


​0.5% of reading above 50 ppb

​Flow Rate

​650 cm3/min ± 10%


​100-120V, 220V-240V, 50/60 Hz


​± 10%


​Included:     Up to 4 analog outputs: 4-20 mA (3 max) or settable DC voltage (0-10V, 0-5V, 0-1V, 0-0.1V)
                      1 x Ethernet: 10/100 Base-T
                      2 x RS-232 (300-115, 200 baud)
                      2 x USB device ports for firmware upgrades
                      8 x opto-isolated digital outputs
                      6 x opto-isolated digital inputs
Optional:     1 x USB communications port
                      1 x RS-485
                      8 x analog inputs (0-10V, 12 bit)
                      4 x digital alarm outputs
                      Multidrop RS-232


41° to 104°F (5° to 40°C)​


​​7"H x 17"W x 23.5"D
(17.8 x 43.2 x 59.7 cm)
41 lbs​ (18.3 kg)​