SD-5M (5 to 25 mm)

SD-6M (30 to 70 mm)

Stem Micro-Variation sensors

Overview

SD-type sensor is a highly precise incremental LVDT-based sensor for monitoring micro-variations of stem diameter in micron range.

Plant growth and water balance affect diurnal behavior of stem diameter. The growth rate depends on a vegetation stage and environmental conditions. The diurnal variations represent mostly fluctuations of water content in plants. Two diameter-based indices are commonly used for evaluating plant water status: daily contraction amplitude and trend of daily maxima. The SD-type sensor allows investigating effects of irrigation rate and other environmental factors on water balance and growth of plants.

The SD-type sensor consists of an LVDT probe mounted in special fixing brackets and a DC powered signal conditioner.

The probe is connected by a standard 1-meter cable to the waterproof box with the signal conditioner inside.

The output cable length should be specified in the order if required.

SD-5M and SD-6M models have different fixing brackets for the same 5 mm LVDT probe. The SD-5M bracket fits stems with 5 to 25 mm in diameter. The SD-6M bracket is suitable for 20 to 70 mm stems.