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- Model L-51 and L-51A - Hygrometer
Model L-51 and L-51A -Hygrometer
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.
A copper-constantan temperature sensor allows accurate ambient temperature measurements to be made for correction of psychrometric readings or for Pv temperature correction when encountering large temperature changes. In use, the section of leaf to be tested is swabbed clean, then inserted in the lateral slot in the body of the sensor. Gentle pressure is applied to capture the leaf between the mount and the measuring chamber. A small amount of petroleum jelly or a beeswax-lanolin mixture is used to effect a vapor seal.
A nylon mounting bracket is included with the sensor to provide thermal isolation from metal support structures.
- Size: 19 mm x 25 mm x 46 mm (exclusive of leads)
- Weight: Approximately 100 grams
- Lead Length: 1.5 meters
- Range: -0.05 MPa to -7 MPa nominally
- Slot Width: 2 mm
- Chamber Dimensions: (MODEL L-51)3 mm diameter x 2 mm deep, (MODEL L-51A) 3 mm by 2 mm x 2 mm deep