Abstract: The invention is directed to a measuring sensor for detecting gaseous components which operates in the diffusion limit current region. The measuring sensor includes a support body and has an electrolyte chamber partitioned by a diffusion membrane from the ambient containing the gaseous components. The measuring electrode of the measuring sensor is improved so that a simpler manipulation for covering the electrolyte chamber with a membrane is possible without endangering the mechanical stability of the membrane. During operation, the detection operation is intended to take place completely at that electrode surface which is in direct electrochemical exchange communication with the electrolyte supply. For this purpose, the coating is configured as an adherent layer to the support body so that it forms an impermeable adherence region in the lateral direction between coating and support body.

Abstract: The invention is directed to an electrochemical measuring cell for measuring ammonia or hydrazine and includes at least a measuring electrode and a counter electrode in an electrolyte. The measuring cell provides a signal increase having a shorter response time and an improved signal stability. For this purpose, the electrolyte is an aqueous solution of a hygroscopic salt of an alkali metal or earth alkali metal such as calcium nitrate or lithium nitrate or a mixture of both salts.

Abstract: The invention is directed to a measuring sensor for detecting gaseous components which operates in the diffusion limit current region. The measuring sensor includes a support body and has an electrolyte chamber partitioned by a diffusion membrane from the ambient containing the gaseous components. The measuring electrode of the measuring sensor is improved so that a simpler manipulation for covering the electrolyte chamber with a membrane is possible without endangering the mechanical stability of the membrane. During operation, the detection operation is intended to take place completely at that electrode surface which is in direct electrochemical exchange communication with the electrolyte supply. For this purpose, the coating is configured as an adherence joiner to the support body so that it forms an impermeable adherence region in the lateral direction between coating and support body.

Abstract: The invention is directed to an electrochemical measuring cell for determining ammonia or hydrazine in a gaseous or liquid measuring sample. The measuring cell has at least one measuring electrode and at least one counter electrode which are disposed in an electrolyte chamber filled with a soluble electrolyte containing a cobalt salt dissolved therein. The electrolyte chamber is closed off in the direction facing toward the measuring sample by a permeable membrane. The measuring cell provides a selective ammonia measurement having the following advantages: a short response time, a linear response and a low tendency to drift. The electrodes of the measuring cell are so configured that the oxidation of the ammonia as a measurement reaction has no influence on the sensitivity of the measuring cell. For this purpose, at least the measuring electrode is provided with a coating containing cobalt oxide which is in direct contact with the electrolyte.

Abstract: The invention relates to an electrochemical measuring cell for detecting selected gaseous components such as hydride gases, sulfur dioxide and nitrogen dioxide by means of at least one measuring electrode and a counter electrode disposed in an electrolyte. The electrodes and the electrolyte are accommodated in a measuring chamber which is closed off to the ambient by a membrane permeable to the substance to be detected. This measuring cell is improved in that the long-term stability of the measuring signal is increased and the measuring sensitivity as well as the selectivity are increased. For this purpose, the electrolyte includes an additive catalyzing the oxidation of the substance to be detected. The additive contained in the electrolyte can be inorganic heteropoly acids or iron salts.

Abstract: The invention is directed to an electrochemical measuring cell for detecting gaseous components with an electrolyte which is disposed between a counter electrode and a measuring electrode provided with gas permeable pores. The pores are configured as channels partially or completely filled with the electrolyte and these channels have a diameter which does not exceed 10 micrometers with a channel length of up to 300 micrometers and a web thickness of not more than 5 micrometers. With this configuration, drift and memory effects are suppressed and the measuring sensitivity is increased and, on the other hand, the response time and the residual current are reduced. When the measuring cell is used as a dosimeter, the counter electrode and the measuring electrode are decoupled with respect to a mass transport in the electrolyte.

Abstract: The invention is directed to an electrochemical measuring cell for determining ammonia or hydrazine in a gaseous or liquid measuring sample. The measuring cell has at least one measuring electrode and at least one counter electrode which are disposed in an electrolyte chamber filled with a soluble electrolyte. The electrolyte chamber is closed off in the direction facing toward the measuring sample by a permeable membrane. The measuring cell provides a selective ammonia measurement having the following advantages: a short response time, a linear response and a low tendency to drift. The electrodes of the measuring cell are so configured that the oxidation of the ammonia as a measurement reaction has no influence on the sensitivity of the measuring cell. For this purpose, at least the measuring electrode is provided with a coating containing cobalt oxide which is in direct contact with the electrolyte.

Abstract: The invention is directed to an electrochemical measuring cell for detecting hydrogen cyanide or sulfur dioxide by means of at least one measuring electrode and a counter electrode disposed in an electrolyte. The electrolyte is accommodated in a measuring chamber closed off with respect to the ambient by a membrane permeable to the substance to be detected. This measuring cell is improved in that the long-term stability of the measuring signal is increased and a corrosion of the electrodes is prevented. For this purpose, the electrolyte in the electrolyte chamber contains an additive of copper salts for catalyzing the oxidation of the substance to be detected.

Abstract: The invention is directed to a dosimeter for detecting gaseous substances or substances dissolved in liquids. The dosimeter includes a detection chamber which is partitioned off with respect to the ambient by a membrane which is permeable to the substance to be detected. The detection chamber is filled with an electrolyte which is subjected to changes in its characteristic under the action of the substance to be detected and these changes can be evaluated as electrical measured values via appropriate electrodes. The electrolyte contains a reagent which goes into an irreversible reaction with the substance to be detected and the dosimeter is improved so that after the evaluation it can be used again for measuring tasks or for collecting the substance to be detected. Furthermore, a calibration or a function test can be carried out on each dosimeter without its measurement readiness being limited thereby.

Abstract: The invention is directed to an electrochemical measuring cell for determining ammonia and its derivatives in a gaseous or liquid measuring sample. The measuring cell has at least one anode and at least one cathode which are disposed in an electrolyte chamber filled with a soluble electrolyte. The electrolyte chamber is closed off in the direction facing toward the measuring sample by a permeable membrane. The measuring cell provides a more selective ammonia sensor having the following advantages: a short response time, a linear response and exhibits the lowest possible tendency toward drift. The electrolyte of the measuring cell is so configured that the reaction products of the measuring reaction do not affect subsequent measurements.