Long Path Gas Cells
Gemini™ Venus™ Glass bodied long path gas cells are classic Hanst cells, first made commercially available by Dr. Phil Hanst, who started producing them after a long career at NASA and the EPA. Hanst cells are in our bloodline at ICL, since we were Phil’s first outlet for his product and Phil’s son Steve, who worked with Phil designing gas cells for 20 years, is now a major shareholder in ICL as well as its Executive Vice President.
Venus™ cells are small to moderate volume long path gas cells designed for all purpose use in industrial and research applications. The cell design has improved significantly over the years with such advances as multilayer proprietary gold mirror coatings, improved purgeable transfer optics, and instrument specific base plate mountings. All Venus cells are fitted with Swagelok® 1/4″ or 1/8″ tube fittings to which valves, hose barbs or compression fittings can be attached. SS Swagelok® Valves are standard on the models listed.
Venus™ cell configurations include ICL’s popular Ultra Mini Cell which measures 3″ x 3″ x 8″ (3 meters fixed path length, 200cc volume), the Long Path Mini Cell (variable path length to 5 meters, 0.5L volume) and fixed and variable path length cells ranging from 4.8 to 8 meters. Heatable, laser aligned, base plate mounted and other custom configurations of Venus™ cells are available. Instrument specific interfaces are available for base plate mounted cell configurations.
Several common Venus™ cell configurations are shown, but custom configurations are available upon request. Prices do include KBr windows, but optional windows can be selected from our transmission window price list. RFQ for wedged windows to limit fringing a/k/a channeling. Cell mounting and other hardware, exclusive of the cell body material and valves, is black anodized aluminum. Fittings and Valves are SS Swagelok®. All cell bodies are borosilicate glass. Mirrors are GemGold™ multi-layer gold coated, removable and easily serviced.
For applications that demand high performance, durability, reliability, simplicity, dependability and serviceability, Gemini™ Mars™ gas cells are the solution. Mars™ long path cells address the most demanding gas sampling requirements of industrial and field deployed FTIR and IR instrumentation with a robust series of metal bodied gas cells with electro-polished stainless steel or electro-less nickel plated aluminum bodies that outperform any gas cell on the market.
A key factor ensuring the durability and serviceability of each Mars™ cell is the use of stainless steel mirrors. These mirrors are extremely durable and they can be reconditioned many times at modest cost, thereby extending the service life of each Mars™ cell for many years. All mirrors are coated with our proprietary Gemgold™ multilayer gold coatings to insure the highest possible performance in demanding environments. Stainless steel optics are inherently superior to diamond turned aluminum mirrors, from the standpoint of longevity and serviceability. While 316 stainless steel tends to resist the corrosive effects of reactive gases, aluminum tends to react with many gases making aluminum subject to corrosion and therefore an inferior optical substrate.
A more effective low cost option to aluminum mirrors is gold coated glass mirrors, which can be special ordered on Mars™ at a discount to the prices of cells with stainless steel mirrors. Mars™ cells feature modular designs with interchangeable and reconditionable components, enabling us to deliver gas cells that are both versatile and serviceable. Metal bodies and cell hardware can be constructed from many materials. Cells from materials such as stainless steel (passivated or electro polished), pure nickel, nickel coated aluminum, black anodized aluminum, and FEP or PTFE coated aluminum are all available and can be configured to user specifications.
Mars™ gas cells can be configured for high vacuum exceeding 1 x 10-9 Torr and high pressure applications. Each Mars™ cell is individually helium leak tested or hydrostatically tested and a helium leak test certificate can be supplied with any cell for $299.00 (Part No. 0009-9281). See www.internationalcrystal.net for a sample vacuum test certification.
Mars Cells can be configured with heating jackets and with user programmable temperature and pressure control and monitoring options.
Several common Mars™ cell configurations are shown, but custom configurations are available upon request. Prices include KBrwindows, but other materials can be selected from our transmission window price list. RFQ for wedged windows to limit fringing. All Mars™ cells use 25 x 4mm windows. Cell mounting and other hardware, exclusive of the cell body material and valves, is black anodized aluminum.
Gemini™ Earth™ glass bodied long path gas cells are, like Venus™ cells, classic Hanst cells, but with larger volumes and longer path lengths. Pathlengths range from 10 to 20 meters and volumes range from 2 to 8 liters.
For applications requiring ultra long path lengths we offer our Saturn™ series multi-pass gas cells that range from 80 to 200 meters. These cells employ an innovative advancement in White cell configuration that effectively triples the operational range of the cell within a moderate size cell volume, thereby providing path lengths in excess of 100 meters that still produce strong signal throughput to enable part per billion (ppb) trace level detection sensitivity in ambient conditions and when sampling gas mixtures.
The spectra show excellent signal to noise performance at 0.5cm-1 resolution in a 160 meter path length cell in a few minutes of elapsed observation time.
All Earth and Saturn cells feature SS Swagelok® valves, multilayer gold coated mirrors, borosilicate glass bodies, transfer optics and base plate configurations to fit most spectrophotometers, and black anodized aluminum hardware. Earth™ cells use 1/4″ SS flow tubes and Swagelok® connections and Saturn cells use 3/8″ SS flow tubes and Swagelok® connections. All variable path length cells incorporate a laser alignment device with a 6 volt DC power supply for path length verification based on the number of passes made through the cell.
Several typical Earth™ and Saturn™ cell configurations are shown, but custom configurations are available upon request. Prices do include KBr windows, but optional windows can be selected from our transmission window price list. RFQ for wedged windows to limit fringing a/k/a channeling. Cell mounting and other hardware, exclusive of the cell body material and valves, is black anodized aluminum. Fittings and Valves are SS Swagelok®. All cell bodies are borosilicate glass. Mirrors are removable and easily serviced.
Short Path Gas Cells
Short Path Gas cells are useful for pure gases and, generally speaking, for concentrations of not less than 100 ppm. Cell utility for various ppm concentrations is dependent not only on path length, but also on the absorbance characteristics of the sample. Feel free to consult with us on these and any other issues concerning selection of an appropriate gas cell.
ICL’s Gemini™ gas cell line begins with our Mercury™ short path length single pass gas cells constructed of electropolished 316 Stainless Steel, available in standard path lengths of 1cm, 2cm, 3cm, 5cm, 10cm and 15cm. Custom path length cells for a variety of applications are also available.
These robustly constructed gas cells are ideal for specialty gas analysis, because they are leak tight and capable of high vacuum performance exceeding 1 x 10-8 Torr, and they also can be made pressure-safe with appropriate window material and thickness selection. Each Mercury™ cell is individually helium leak tested or hydrostatically tested and a test certificate can be supplied with any cell for $299.00 (Part No. 0009-9281).
Mercury™ cell configurations include base plate mounted, slide mounted and heated versions with temperature controllers. Purge maintaining connectors or couplers extending from the cell body to the sample compartment walls are standard on many base plate mounted models and purge gas connections are an available option. A wide variety of window materials can be used. Wedged windows are available to limit fringing. Instrument-specific spectrophotometer interfaces are available.
Mercury™ cells feature high-vacuum welded gas fittings without valves comprising the sample inlet and outlet to maintain the leak-free integrity of the cell and assure high vacuum performance. Inlets and outlets comprise a Swagelok® VCR gland, a VCR female nut, a male VCR nut and a 1/4″ Swagelok® adapter. Valve kits are available.
Several common Mercury™ cell configurations are shown, but custom configurations are available upon request. Prices do not include windows, which can be selected from our transmission window price list. RFQ for wedged windows. Cell mounting and other hardware, exclusive of the cell body material and valves, is black anodized aluminum.
This heated cell can be configured as a gas cell (Fig. 2) or for vaporizing samples that are normally solids or liquids at room temperature. Configured for gas sampling, the cell incorporates 2 valves, an inlet and an outlet, that enable flowing gas samples through the cell.
In its solid and liquid vaporization configuration, the cell has an outlet needle valve from which a vacuum can be pulled and two (2) sample inlets. One inlet is a needle septa injection port on the top of the cell which is similar to the type used in gas chromatography. There is a second inlet in the form of a side port for inserting solid samples, which also doubles as the thermocouple port. Using the side port eliminates the need to recheck vacuum seals whenever the cell is opened to insert solid samples. The 250w heating jacket extends over the end of the cell so that both the cell body and the optics are heated, and allows operation at temperatures up to 200°C. Condensation on the optics is minimized by heating them to the same temperature as the sample chamber. A type J iron constantan thermocouple is provided with plugs which are compatible with the optional temperature controller. The cell body is type 304 stainless steel and an assortment of seals is provided – silicon rubber, viton and PTFE.
Cells are factory pretested for vacuum leaks using dummy windows and then new windows are shipped with the cell. The cell comes standard with 47 x 6mm KClwindows. The clear aperture is 39mm. Other window materials are available. Requires either a cell mount (0008-5162) (Fig. 1) or base plate mount (0008-9405) (Fig. 2). An optional high stability temperature controller is available. The temperature controller has ramp and soak cycles that can be programmed on the keypad.
The G-2 Gas Cell is for analysis of pure gases or gas mixtures in which component gases are present at concentrations of 5 percent or more. The G-2 Gas Cell has a fixed pathlength of either 5cm or 10cm. The windows of the cell are easy to remove for cleaning, making the G-2 ideal for working with wet or reactive gases that have a tendency to fog or attack the window material.
The G-2 cell comes completely assembled in a stainless steel universal 2” x 3” mount. It includes a Pyrex® glass body, silicon rubber or Viton® gaskets and a choice of optical materials. The window size is 38mm x 6mm. The clear aperture of the cell is 32mm.
The G-2 is available in a variety of optical window materials, two pathlengths and a choice of ground tapered endings with 12/30 joints (TPE), plain endings joints (PTE) or ground semi-ball joints with 18/9 joints (SBJ). (See notes beneath chart and diagram).
The demountable Beta Gas Cell comes complete with a 10cm or 5cm Pyrex Cell body, cell mount, 2 Viton® O-rings or gaskets, 2 PTFE gaskets, and 2 septa, but without windows. (Windows and gaskets can be ordered separately). The window size is 25mm x 4mm. When assembled, the cell will be gas tight and operable at both reduced or positive pressures. Filling of the cell is conveniently handled with a gas tight syringe (ICL Part no. 0009-609). The exploded view shows the assembly and disassembly sequence of the cell.
The G-2SS stainless steel gas cell is useful for qualitative analysis of pure gases and mixtures where one or more of the constituent gases are present in concentrations of at least 5 percent. It can be used in situations that make use of a glass cell impractical, such as applications involving high pressure or gases that etch a glass cell body.
The only functional constraint on the pressure that can be applied to this cell is the window material selected. The clear aperture of the cell is 39mm and it uses 47mm x 6mm windows. Like the G-2, this cell uses a universal 2” x 3” slide mount that fits all spectrophotometers. However, it is also available base plate mounted (See Fig. 1). There are inlet and outlet ports equipped with vacuum valves and hose barbs that are configured to also allow flowing gas through the cell. An 1/4 NPT port in the side of the cell allows the addition of a pressure gauge, a thermocouple and other probes. The cell uses nitrile “O” rings and PTFE gaskets. KBr and NaCl are the basic window material, but other materials are available upon request. Can be heated.
All components of the G-3PTFE 10cm gas cell that contact the sample can be made entirely of PTFE, making the cell useful for any gas sample that might attack, or be contaminated by, glass or stainless steel gas cell components.
The G-3PTFE is useful for analysis of pure gases and mixtures in which the constituent gases are present in concentrations of 5% or more. The G-3PTFE has a clear aperture of 39mm and uses 47 x 6mm windows. Swagelok® SS valves are standard, but PFA valves are optional. A heated version is available. Requires a cell mount (Part No. 0008-5162) or optional base plate mount (Fig. 1) (Part No. 0008-9404).