Method and device for detecting conductivity in instant electric water heater

An electric water heater, instant heating technology, applied in the direction of fluid resistance measurement, etc., to achieve the effect of simple cost

Active Publication Date: 2015-09-09
STIEBEL ELTRON
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  • Abstract
  • Description
  • Claims
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However, expensive security systems are at odds with of

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  • Method and device for detecting conductivity in instant electric water heater
  • Method and device for detecting conductivity in instant electric water heater
  • Method and device for detecting conductivity in instant electric water heater

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[0035] figure 1 The schematic diagram of shows the two channel walls 1 of the channel for guiding water 2, which is therefore the measuring medium whose conductivity or resistivity is to be tested here. Two electrodes 3, which may also be referred to as probes 3, are guided through one of the channel walls 1 in a liquid-tight manner in order to conduct a measurement current between the electrodes for detecting the conductivity of the water 2 or the measurement medium 2. The electrode 3 is connected to the secondary side 52 of the transformer 5. The transformer 5 is loaded with an alternating voltage on the primary side at its primary side 51, and the alternating voltage is generated by the alternator 6. For this purpose, the alternator 6 is activated by a microcontroller 7 with the aid of a corresponding switching signal, which is also referred to as μController for short. The alternator 6 thus generates an alternating voltage via pulse width modulation, which is therefore inp...

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Abstract

The invention relates to a method and device for detecting conductivity in an instant electric water heater. The measurement device comprises at least two measurement electrodes for being arranged in a water guiding channel separately; a measurement electronic device for providing and analyzing electrical signals influenced by the conductivity of the water; and a transformer, wherein the measurement electronic device is connected to a primary side of the transformer, and the two measurement electrodes are connected to a secondary side of the transformer, so that the measurement electronic device is allowed to be coupled with the measurement electrodes through the transformer. The measurement electronic device provides a primary-side alternating voltage signal on the primary side of the transformer according to rules, so that a secondary-side alternating current passing through the measurement electrodes and the water is set on the secondary side of the transformer according to the conductivity of the water, and the secondary-side alternating current influences the current of the primary side on the primary side of the transformer; and the measurement electronic device measures the current of the primary side for determining the conductivity. Besides, the invention also relates to the instant electric water heater for heating the water.

Description

technical field [0001] The invention relates to a measuring device for detecting the conductivity of water in an instant electric water heater, and also relates to an instant electric water heater equipped with the measuring device. Furthermore, the present invention relates to a method of detecting the conductivity of water in an electric tankless water heater. Background technique [0002] Instantaneous electric water heaters are known, which heat the water by means of one or more electric heating coils, in particular formed with bare heating wires, or by means of similar heating means, while the water flows through them. Such instant electric water heaters are especially suitable for domestic use, and the water heated by said instant electric water heater is then usually used directly after heating, which applies not only in terms of time but also in terms of location. Such use could be, for example, showering or washing hands. The danger due to the current flow of the ...

Claims

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Application Information

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IPC IPC(8): G01R27/22
Inventor 托尔斯滕·沃伊切霍夫斯基迈克尔·格罗贝
Owner STIEBEL ELTRON
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