ELITechGroup products

This leaf press was designed at the University of Minnesota.  The liquid sample is extracted directly to a filter paper disc.  The disc can then be inserted into a Wescor Vapor Pressure Osmometer or a C-52 Sample Chamber for determination of the osmotic potential. Using this press simplifies the liquid extraction process and reduces errors due to concentration of the sample by evaporation.

The proven transducer in soil research programs, Wescor`s in situ soil psychrometers, model PST-55 are buried within the bulk soil to determine the soil water potential. The PST-55 has a stainless steel screen to allow only the water vapor to enter the sensor. A ceramic screen is also available as model PCT-55. To maintain temperature equilibrium, the sensors must be buried at least 15 cm under the soil surface. The soil psychrometer must be connected to a Wescor water potential instrument such as the PSYPRO, HR-33T, or CR7 for operation.

The standard in water potential measurement, Wescor`s Dew Point Microvoltmeter, model HR-33T, can determine water potential using both dew point and wet bulb methods. It contains sophisticated sensing and control circuitry that automatically maintains the temperature of the thermocouple junction at the dew point temperature when operating in the dew point mode. The HR-33T can be used in both a laboratory and a field environment. When coupled with our Virtual Strip Chart Recorder (part AC-050) the HR-33T is ideal for teaching students about water potential determination using psychrometric principles.

Wescor`s sample chamber, model C-52, can measure the water potential of solutions, small soil or leaf samples, and leaf discs. Due to the solid aluminum housing, the C-52 provides highly accurate water potential measurements without the need for a constant temperature bath. The C-52 must be connected to a Wescor water potential instrument such as the PSYPRO, HR-33T, or CR7 for operation. The Sample Chamber measures water potential of small samples in the laboratory or in the field without requiring a constant temperature bath.  A precision thermocouple transducer in an internal chamber functions either as a psychrometer (wet bulb depression method), or as a hygrometer (dew point depression method) depending upon the type of readout equipment employed.  Researchers have reported exceptional ease and accuracy using this chamber, resulting in more and better data from field and/or laboratory research.

The L-51 Leaf Hygrometer is designed for in situ measurement of leaf water potential, using either the wet bulb or dew point method of data readout.  L-51A has a special chamber configuration for use with grass.  The all-metal thermocouple mounting system is similar to that used in the C-52 Sample Chamber.  Given isothermal conditions, this configuration provides rapid equilibration and excellent precision.

Automated ESR solution for smaller sized laboratories who require “walk away” capability. 10 Channels. Random Access. Up to 40 tests/H. 15 – 30 – 60 min. reading time capability. Pre-Reading after 11 min.. Correlated to Westergren method. Measurement; infrared detector. Automatic temperature correction (Manley).

The ideal automated ESR solution for large laboratories. Mix-Rate 100 Channels. Random Access or Batch Analysis. 15 – 30 – 60 min. working time. Up to 400 tests/H. Host Connection. QC Software. Built in Printer and Barcode Scanner. Measurement; infrared detector. Correlated to Westergren method. Automatic temperature correction (Manley). Internal keyboard. Graphic user interface.