Sap flow gauge

Details Sap flow gauge Sap flow gauge

1994-06-06

1996-01-02

Walberg, Teresa J.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219549, H05B 336

Patent

active

054810906

ABSTRACT:
A sap flow gauge (10) which can accommodate stem or other plant parts (S, S') of very small and/or varying cross-sectional configuration is provided which includes a generally U-shaped body (12) presenting a central bight portion (50), a pair of spaced, opposed legs (52, 54) and a stem-receiving passageway (56). The body (12) preferably includes a pair of spaced, endmost filler pads (16, 18) which support a bridging strip-type resistance heater (28). The heater (28) has one end thereof affixed to an adjacent filler pad (16), with the remaining end of the heater (28) thereof being free. A flux sensing thermopile (40), as well as spaced, temperature differential sensing thermocouple pairs (44, 46) are also supported by the central bight region of the body (12). In practice, the gauge (10) is applied to a stem (S, S') by wrapping the body (12) around the stem (S, S') with strip heater (28) in engagement with the stem (S, S'); the filler pads (16, 18), together with the free end of the strip heater (28) insure close, conforming, heat transfer engagement between the strip heater (28) and the stem (S, S').

REFERENCES:
patent: 1240871 (1917-09-01), Parrish
patent: 1260441 (1918-03-01), Parrish
patent: 3296415 (1967-01-01), Eisler
patent: 3344392 (1967-09-01), Briscoe
patent: 4369356 (1983-01-01), Tsurutani et al.

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