The V-Gen is a novel and versatile water vapor generator and calibration system. High quality and performance, low cost, and simplicity of operation make it ideally suited for a wide variety of applications requiring an accurate and stable source of water vapor. Instruments like X-Ray Diffractometer, DMA, TGA can be easily upgraded with RH option using this generator. The V-Gen employs the fundamental, Two-Temperature principle to generate stable dew points from 0 to 90 ˚C. Additional, Divided-Flow method is used to generate low values of relative humidity (RH) that are not available by the Two-Temperature method alone. However, a RH probe is needed to utilize the divided flow method. The miniature, high-temperature RH probe is normally supplied with this generator for control/verification purposes. RH values from 0 to 100% are readily available up to 85 ˚C with RH probe. A precision pressure regulator isolates the selectable flow rate from fluctuations in the supply line. An automatic water supply system eliminates frequent user intervention inherent to other generators. The generated water vapor stream is delivered to the location of choice via flexible heated transfer line. To avoid condensation problems, the temperature of the transfer line is automatically maintained at a higher temperature than the current dew point value. Depending on the type and location of sensors involved in the RH control, several modes of operation are available. Additional modes can be implemented to address application specific requirements. Mode 1 (minimal hardware requirements) – the temperature of the user sample chamber needs to be known and entered in the experiment definition template form. Mode 2 (the calibrated external temperature probe, RTD based, is used for temperature monitoring of the sample chamber) the Two-Temperature method is materialized and the RH is automatically adjusted based on the current temperature of the user chamber. Mode 3 – the main mode - (RH probe is used for RH and temperature monitoring inside the user sample chamber) – the complete range of RH is materialized (two-temperature and divided flow methods). Experiment design and multi-mode control using Windows ® based PC software User-friendly software features up to 1000 RH steps per run, hardware diagnostics, graphing, reporting, data recording, flexibility of experiment modifications during the run, and RH calculations. An experiment design template can be saved and a new experiment can be executed with just a few mouse clicks. Dew Point Temperature: Range: 0 to 90 ˚C Accuracy: ± 0.2 ˚C Stability: ± 0.1 ˚C RH range: 0 to 100 % Maximum temperature of saturator: 95 ˚C Maximum temperature of condenser: 90 ˚C Thermal protection: Thermal cut-offs temperature limits are also set in the temperature controllers. Flow Rate: Determined by the rotameter range, Available ranges: 50, 100, 200, 500, 1000 cc/min. Gas Type: Typically inert gas, air or N2 Gas Inlet Port: 1/8” (Swagelok ® type bulkhead) Gas Inlet Pressure: Maximum: 100 psi (7 bar) Minimum: 10 psi (0.7 bar) above set pressure Outlet port: 0.25” (6.35 mm) OD tubing – (the fitting can be easily replaced to accommodate other sizes). Transfer hose dimensions: Heated length about - 1.0 m (40”) 0.25” OD (6.4mm), 3/16” ID Thickness w/ insulation: about 16-17 mm (0.65”) Other lengths and sizes available as options Transfer hose Temperature: Maximum (Continuous) 100 ˚C Minimum: Ambient Dimensions: (W x H x D) (22.2 x 29 x 40.7 cm) (8.7” x 11.4” x 16”) Instrument Weight: 12 kg (27 lb) Power Requirements: 110 VAC, 400VA, 60 Hz nominal (Optional): 220 VAC, 400VA, 50 Hz nominal Stable Dew Point / RH source suitable for: X-Ray Diffractometer, DMA, TGA, etc. Gravimetric sorption systems Permeation measurement instruments Relative humidity sensors calibration Sample conditioning in specialized instrumentation
Applications: - True density measurements of solids (e.g. fine powders, foams, etc). - Determination of density at precise relative humidity and temperature values (with RH probe) - Filter integrity tester - bubble point and pressure decay tests (with ancillary hardware) - RH sensor calibrator (with saturated salt solutions) - Determination of RH atmosphere over different mixtures, solutions - Outgassing of samples using vacuum to a specified RH value or other conditions - Remote control from PC for working with dangerous samples (under the hood) Design highlights: - Manual and Automatic operation (Windows based software) - Progressive gas pressurization and depressurization (nano-powders, no-elutriation) - Dual reference chamber for the largest range of volume measurements - Relative humidity and temperature measurements inside the sample chamber - 24-bit data acquisition, high accuracy and excellent repeatability - Pressure regulator and gauge (at the back panel of the instrument) - Superior for foam density measurements (ASTM D6226-05) - Variety of ancillary hardware for other applications, e.g. for filter integrity testing (largest pore sizes), RH probe calibrations, - Small size and mass, portable - Designed for easy customization to fulfill application specific requirements - Sophisticated and interactive software for experiment design and control (our software is compatible with 64-bit Windows operating system) - All experimental data are recorded and transferable (macro) to Excel. - Volumetric density measurements using pressure range from vacuum to 50 psi (345 kPa) and temperature range from sub ambient to 50C, with parallel relative humidity (RH) data (0-100%) - RH analysis in the pressure and temperature range, sorption and kinetic data from multiple headspace extraction - Designed especially for true density measurements of fine powders and foams - Bubble Point and Pressure Decay Methods for characterization of filters /membranes The most versatile gas (helium) pycnometers available; with many options, software compatible with 64-bit Windows operating system, and for every budget. Design highlights: - Integration of automatic and manually operated pycnometer into one system - Integrated temperature control - Continuous flow of gas in and out of sample chamber - Relative Humidity (RH) and temperature measurements inside the sample chamber - Vacuum port (standard in all models) - 24-bit data acquisition, high accuracy pressure transducer - Independent precision pressure regulation - Auto Mode (Windows operating system) and Manual mode of operation - Sophisticated and interactive software for experiment design and control - Macro transferring data to Excel for additional analysis - All experimental data recorded and available to the user Advantages: - Many capabilities in one instrument, high accuracy, and precision - Volume and density data obtained at precisely defined temperature, pressure, and RH conditions - Dual reference chamber for the largest range of volume measurements - No sample elutriation during treatment and analysis, designed for fine powders - Any sample holder up to about 2" (52mm) O.D., and 2" (52mm) Height - Elimination of shortcomings of other pycnometers that use only On/Off valves - Ability of incorporating of additional sensors - Multiple headspace extraction capabilities - Determination of RH atmosphere caused by solids, liquids, or slurries - Availability of equilibration profiles vs. time data for kinetic and sorption studies - Foam density measurements (open cell content, other characterizations) - Very low cost - Small size, (8.7" x 11.4" x 19") 22cm x 29cm x 43cm - Determination of foam density (open-cell, closed-cell percentage) using the HumiPyc ™ - density analyzer. Profile of density vs. pressurization pressure instead of a single number. - Combining the Enhanced Bubble Point and Pressure Decay methods in characterization of micro-filtration products using the HumiPyc. To find out more about HumiPyc capabilities as filter integrity tester, please read this application note. - Determination of actual performance of gas pycnometer vs. quoted specifications... review
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High capacity (typically 100/220g or 120g) Sartorius semi-microbalance eg. CPA 225D - Electromagnetic force compensation - Thermal compensation - Adaptable to noisy environments - Integrated calibration weight - Overload protection - Readability (model dependent), typically 10 or 100 micrograms - Superior accuracy and stability V-GA isothermal chamber - Temperature control of sample chamber from sub-ambient to 95C with stability +- 0.1C - Temperature of experiment from sub-ambient to 60 C at full range of RH (standard model) - Sample chamber size (5.2cm x 5.2cm x 12.8cm), different sizes optional - High temperature digital RH probe (RH and T data) (in the vicinity of the sample) - Additional temperature sensor (RTD) (in the vicinity of the sample) - Proprietary design of vapors exhaust system and anti-condensation protection - Uniform RH distribution (special diffuser) - Dual gas/vapor entry ports - Large area sample holders with fine mesh bottoms - USB/Serial communication port for transfer of RH and temperature data to PC - Small size of instrument (w/o balance): 23cm x 27cm x 38cm The main components of the modular V-GA flow system: Selection of one of the two RH generators: (Each of the RH generators can be used separately for other applications and the operational software is provided.) Typical Applications - Monitoring the sample mass uptake or loss as a function of time by varying relative humidity or temperature (or both). - Study of permeability of different vapors through membranes, fabrics in controlled RH and temperature environment using special cells. - Possible expansion to density and surface tension measurements. Advantages - More representative sample can be used - No limit on dynamic range (compare to 500mg or +-200mg of other microbalances) - Large selection of balances and weighing modules to satisfy any application - Easy installation by the user, virtually maintenance free - Independent modules, each with its own software - Robust, easy to service and operate - Perfect for R&D and industrial QC environment - Economical to use (air can be supplied from a compressor) - Special applications can be easily addressed - Independent use of modules for other purposes, e.g. RH Generator - Ability to measure water vapor transport rates, WVTR, using special cells - Capability of determining of organic vapors permeability through membranes - Ability to determine deliquescence points - Low cost Windows® based operational software for the combined modules - Intuitive design of experiment protocols and saving them for reuse - Isothermal profiles - Iso-humidity profiles - Isobars - Fast run - Up to 1000 steps per run - Ability to select and combine several equilibrium criteria - Calculation utility for solving variety of "RH problems" - Graphing, generating reports, viewing previous data - Ability to modify experiment parameters at any time - USB/Serial communication with a PC - Automated installation
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Complete solution for measurements of foams volume (density) Software compatible with 64-bit Windows® operating systems To reduce errors in determination of physical volume measurements of a foam sample, additional hardware for cutting exact shapes can be provided. The first volume measurement of the whole foam sample using a gas pycnometer yields the uncorrected volume which is only accurate for predominantly open-cell structures. To obtain correction for closed cells that were cut during the foam sample preparation, the original specimen is cut into pieces to expose additional closed cells (proportional to surface area) and the foam pieces are measured again. From the geometric volume, and the first and second pycnometric runs, parameters like porosity, percentages of closed and opened cells can be calculated. The foam calculator available in newer software versions facilitates these easy calculations. The gas pycnometer also allows foam volume (density) measurements at programmable pressure levels and the results can serve for further characterization of foams (e.g. compressibility, recovery from compression). For flat foam samples primarily designed for filtering, bubble point pressure (largest pore(s)) can be determined using additional hardware. Design features: - Fully automated operation via PC - Novel software approach for experiment design and convenience of operation - Ability to set low pressures to avoid foam distortion and carry out accurate measurements using 24-bit resolution - True gas purge using a separate exhaust (similar design as in the cement density and fineness (specific surface area determination technique (Permeametry) - The foam sample can be purged to specific relative humidity value using optional RH probe. - Specific (optional) hardware for other analytical capabilities Measurement of true density, porosity, percentages of open-cell / closed-cell of foams plays important role in development and quality control of various properties of the cellular materials. Characterization of foams presents its own challenges and the highest performance gas pycnometers and dedicated accessories need to be used. The enhanced and optimized HumiPyc Gas (Helium) Pycnometers with dedicated hardware are superior tools for foams characterizations. Standard test methods for foam open cell content, like ASTM D6226 or ISO 4590 stipulate specific shapes and sizes of foam samples. To optimize the foam volume determinations results, volume reducing adapters accepting cubes or cylindrical shapes can be provided.
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Adding Enhanced Bubble Point (active pore size determination) and Pressure Decay methods to the true density and moisture analysis capabilities of the HumiPyc The unique design of the HumiPyc - gas (helium nitrogen, air) pycnometer and its closure of the sample chamber allow for additional usage for testing of packed beds and filter integrity (bubble point, pressure decay methods). One of the assemblies depicted on the photo below (with a paper filter inside) has transparent upper part for visual observation of the bubbles. The outlet from the chamber can be connected to a flow meter to implement additional capabilities (forward flow method, capillary porometer). Please contact us at support@instruquest.com regarding inquiries for any application-specific requirements of the Bubble Point and Pressure Decay analyzer. - Pore diameter range from micrometers to millimeters - Enhanced bubble point method - Pressure decay (pressure drop) method - Integration of density, pore analysis, and gas transport properties - Programmable pressure rate increase - High performance R&D tool for product testing and development - Open-design for easy customization to address specific requirements - Excellent resolution for large pore sizes - Temperature measurements of the externally located sample holder - Minimal added cost compared to purchasing of a separate bubble point or pressure decay tester Addition of the Bubble Point and Pressure Decay tests capabilities to the HumiPyc requires only optional hardware for the sample holding as the progressive gas dosing, all hardware, and the high resolution (24-bit) data acquisition are already a part of the gas pycnometer. The sample can be measured inside the temperature-controlled compartment of the HumiPyc or it can be measured external to the instrument. The external location of the sample holding hardware allows for larger spectrum of samples to be measured and facilitates visual determination of the onset of bubbles formation. The increase in gas pressure can be done manually or automatically and the experimental data are graphed and recorded. Considering the vast diversity of samples, their affinity towards the wetting liquid, and the pressure spectrum employed, it is recommended to combine the visual observations and the automatically obtained data for the most reliable results of the bubble point method.
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