US 4,393,686 AGranted

Circuit arrangement for a gas measuring and gas analysis apparatus

AssigneeAuergesellschaft GmbH

InventorHans-Jorg Fengler

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Abstract

A circuit arrangement for an apparatus for measuring and analyzing gases which emits a signal when a specified gas concentration is exceeded and which is capable of recalling the maximum value of gas concentration measured. A binary counter acted upon by an oscillator is connected to a digital-analog converter via a digital storage, and a digital-comparator compares the binary values of the counter output from the binary counter and the input to the digital-analog converter. An analog comparator receives the measured value input from a gas measuring device and the maximum value output from the digital-analog converter, and the digital storage is opened via a logic section when the voltage at the measured value input is greater than the voltage at the maximum value output and the digital storage also has equal signals at the input and output thereof.

Claims5

Dependent claims

A circuit arrangement for an apparatus for measuring and analyzing gases and consisting of a measuring part with an indicating and warning device, characterized by the provision of:

(a) a binary counter which is acted upon by an oscillator and which is connected to a digital-analog converter through a digital storage,
(b) a digital-comparator connected for comparing the binary values of the counter output from the binary counter and the input to the digital-analog converter,
(c) an analog comparator which is connected to a measured-value input from the measuring part and to a maximum value output of the digital-analog converter, the analog comparator connected to a digital section and adapted for actuating the digital logic section such that said logic section opens and closes the digital storage, and
(d) a chargeover switch located between the measuring part and the indicating device and connected for switching the maximum value output to the measured value input on the input of said indicating device.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 06/298,015Filed 31 Aug 1981
Priority: DE 303155521 Aug 1980
Granted: 19 Jul 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01N 33/0062
General constructional details of gas analysers, e.g. portable test equipment: concerning the measuring method or the display, e.g. intermittent…
G01D 1/12
Measuring arrangements giving results other than momentary value of variable, of general application: giving a maximum or minimum of a value
G01N
Investigating or analysing materials by determining their chemical or physical properties
G01D
Measuring not specially adapted for a specific variable

Family

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