Liquid measuring device and measuring head device for moisture detection, in particular in containers for liquid-sensitive electrical and / or electronic components in road vehicles

摘要

The invention relates to a liquid measuring device and a measuring head device, wherein the liquid measuring device comprises: a measuring head device (30) with a measuring head (40) which comprises at least two electrodes (51, 52) held separately from one another, wherein the measuring head (40) has two measuring head contacts (61, 62) and each of the measuring head contacts (61, 62) is electrically conductively connected to one of the at least two electrodes (51, 52) in the measuring head (40); and a measurement circuit (110) having two connection contacts (131, 132), wherein each of the connection contacts (131, 132) is electrically connected to one of the measurement head contacts (61, 62), and wherein the measurement circuit (110) comprises a pulsed current source (120). comprising pulsed to energize the measuring head (40) connected to the connection contacts (131, 132), and wherein the measuring circuit (110) has an output circuit (140) between the connection contacts (131, 132) with at least one measuring capacitor (144) and a Evaluation circuit (150) for determining a charge state information of the measuring capacitor (144) in the output circuit (140), wherein in the measuring head (40) an additional circuit (70) is formed and connected to the Meßkopfkontakten (61, 62), which basic Determines capacitance and base resistance characteristics between the probe contacts (61, 62), which correspond to those capacitance and resistance characteristics between the probe contacts, which vary at one contact ktierung with a predetermined partial wetting of the at least two electrodes (51, 52) by means of a conductive fluid having a predetermined conductivity without an existence of the additional circuit (70) sets.