While the mixSorb S and SHP can be equipped with Peltier-controlled “Bubbler”-type evaporatores, the mixSorb L features a liquid injection-type evaporator. This technology has the advantage that the liquid is dosed precisely, mixed with the gas (spray formation) and then evaporated – therefore dosing is completely independent from experimental pressure and temperature! Additionally, liquid mixtures can be incorporated, if the liquids are miscible. The knowledge of the gas and liquid flow rates gives an accurate indication of the vapor concentration/humidity, without actually measuring it.

Flow Scheme of the mixSorb L Vapor Option

Liquid dosing system for mixSorb L

• High precision Coriolis-type Mass Flow Controller
• Accuracy: 0.2 % of rate
• Flow range: 0.4 to 20 g/h
• Materials: Body: Stainless Steel 316L, Seals: FFKM
• Pressurized with a diaphragm pump (Materials: PEEK, PTFE, FFKM)
• Connections on the instrument: 1/8” tubing

With the Vacuum-Option, a Vacuum Pump can be connected to the instrument. A Software function is enabled, which allows the activation of the pump to evacuate the manifold and the adsorber column during pretreatments or analyses.
Besides a more effective sample pretreatment, this option allows the emulation of a VPSA-process (Vacuum-Pressure Swing-Adsorption) with one adsorber column.
You can use the “Vacuum-ready” option and your own vacuum pump or order one of two vacuum pumps together with this option.
If you want to apply vacuum only for sample pretreatment without gas flow or with very small carrier gas flow (below 100 ml/min STP), the “diaphragm pump” option is sufficient. Pressures as low as 75 mbar can be obtained.
If you want to apply low pressures under higher gas flow (up to 1000 ml/min STP), especially for the special application of Vacuum Pressure Swing Adsorption (VPSA) you should order the “scroll pump” option, which allows higher gas throughput and pressures as low as 0.02 mbar.

mixSorb L: Besides the Standard Adsorber (inner diameter 30 mm, bed height 180 mm, 4 temperature probes), there is an optional Small Adsorber (inner diameter 10 mm, bed height 50 mm, 1 temperature probe) for the mixSorb L

Standard Adsorber (left) and Small Adsorber (right) for the mixSorb L

We recommend to use the Standard Adsorber whenever possible, due to the more realistic fixed bed and larger measurement effects. However, the small Adsorber is designed to enable measurement with low gas concentrations on high-performance materials. Such measurements can take up to several days or weeks with the Standard Adsorber. The reduction of the sample mass shortens measurement times drastically. The small Adsorber is not designed for powder samples and samples with low performance. The particle sizes for both Adsorbers should be > 0.1 mm

Additionally, any kind of Custom Adsorber can be designed with the input of the customer (larger sizes, or sizes in between)

mixSorb S: The mixSorb S and SHP are equipped with a micro adsorber with a bed volume of less than 1 cm³. The instruments are designed in a way, that the larger adsorbers of the mixSorb L fit to the other mixSorb instruments and vice versa.

Th recirculating bath extends the temperature range of the instrument to -20 °C to 90 °C (with the bath) + 40 °C to 400 °C (with the standard electrical heating) and furthermore increases the thermal stability drastically. The device can be fully controlled with the dynaWin software.

The circulating liquid also supplies a manifold heat exchanger that cools/heats the gas mixture to the desired experimental temperature before it enters the sample cell (adsorber) to prevent non-adsorption-related temperature gradients.

The Recirculator has the following specifications

• Temperature stability: ± 0.01ºC
• Power consumption 2400 W (rated at 120 or 240 VAC)
• Maximum heating power consumption: 2200 W
• Maximum cooling power consumption: 20 °C: 915 W, 0 °C: 505 W, -20 °C: 165 W
• Maximum flow out for fluid: 22 LPM
• Maximum flow in for fluid: 15 LPM
• Reservoir volume: 15 L
• Temperature range: -20 ºC to 90 ºC
• Maximum ambient temperature: 35 °C
• Ambient relative humidity: Up to 80% at 30 °C in a condensation free environment
• Dimensions: 569 x 368 x 683 mm (22.4 x 14.5 x 26.9 inches)
• Weight: 53.5 kg (118 pounds).

The recirculating beaker has be used with any type of recirculating bath (it is recommended to use the recirculator option). This special designed aluminum dewar helps to hold the sample cell (adsorber) at a very constant temperature. It can be filled with any kind of heat transfer fluid. This liquid has no contact with the primary circulating liquid. This prevents the sample cell to get in contact with the primary circulating liquid, that may contain some unwanted components.

While any additional analytics can be attached to the dynaSorb BT by default, with the Mass Spectrometer Option, a Pfeiffer® mass spectrometer (ThermoStar™ or OmniStar™) can be remote-controlled by the dynaWin software. Controlling includes turning the filaments on/off and starting/stopping data acquisition with the Pfeiffer® QUADERA® Software.
The package includes a communication cable and a capillary holder to connect the dynaSorb BT with your corresponding mass spectrometer.

A Flowmeter can be included in the Manifold to measure the mass flow after the adsorber column. Since, at high concentrations, the mass flow, which is flowing into the column, is different from the mass flow which is flowing out of the column, until 100% breakthrough is reached. This option is necessary when you want to determine mixture equilibrium data with the dynaSorb BT.
The measured flow is always given for nitrogen equivalents at standard conditions since the gas passing the controller has a variable composition. With the help of gas factors, the integration routines of dynaWin and dynaSim correct the measured flow rates by taking into account the measured concentrations of each gas species at each point of the measurement to calculate loadings.

mixSorb L: While all MFCs come with Kalrez (FFKM) seals, the seals of the valves in the manifold are Viton (EPDM in older versions) by default. These can be upgraded to Kalrez as well (“Kalrez” option). Other sealing materials on request. The Standard working seals for the sample cell are made of copper (CF and VCR seals). There are other sealing materials (Teflon, Viton, Stainless steel) on request.

mixSorb S and SHP: All MFCs come with FFKM seals, the valves are equipped with PEEK and FKM seals.