An unprotected chromel-constantan thermocouple was mounted in a cavity (4 × 2 × 1 mm) with rounded corners in a chrome-plated brass block (10 × 6 × 4 mm). When installed against a soybean (Glycine max [L.] Merr.) xylem face, sealed with caulking gum, and insulated with polyurethane foam and aluminum foil, even rapidly changing stem water potentials could be followed accurately. Temperature gradients can be a problem.
展开▼
机译：在镀铬黄铜块（10×6×4 mm）中，将一个无保护的chrome-constantan热电偶安装在一个带有圆角的空腔（4×2×1 mm）中。当安装在大豆（Glycine max [L.] Merr。）木质部表面上，用填缝胶密封，并用聚氨酯泡沫和铝箔绝缘时，即使迅速变化的茎干水势也可以准确地跟踪。温度梯度可能是个问题。
展开▼
