Constant temperature combustable gas concentration detector

A gas concentration detection, constant temperature technology, applied in the direction of material resistance, can solve the problems of unstable carbon deposition structure, damage to sensitive components, small detection range, etc., to achieve good zero point stability, extended detection range, and long service life.

CN100403017CInactive Publication Date: 2008-07-16赵飞
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2008-07-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The constant temperature combustible gas concentration detector has bridge circuit comprising sensitive element and resistors, and compensating element, the constant temperature control loop comprising the bridge circuit, comparator and power regulator, the compensating circuit with the compensating element and with or without parallel expanding compensation resistor, and constant current power source circuit connected to the constant temperature control loop and the compensating circuit. The constant temperature control loop outputs detection signal V1, and the compensating circuit outputs compensating signal V0. The present invention has the advantages of high long-term stability, long service life, convenient intelligent treatment, wide detected combustible gas concentration range, etc.
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Description

technical field

[0001] The invention relates to a safety device for measuring the concentration of combustible gas, more specifically, relates to a constant temperature combustible gas concentration detection device. Background technique

[0002] At present, the commonly used method for detecting the concentration of combustible gas is to use catalytic combustion gas sensor for detection. The catalytic combustion gas sensor usually consists of a sensitive element sensitive to combustible gas with a catalyst (hereinafter referred to as the sensitive element) and a compensating element without a catalyst that is not sensitive to combustible gas and has a temperature characteristic similar to that of the sensitive element (hereinafter referred to as Compensation element) to form an element pair, connect the sensitive element, compensation element and resistance to the bridge, and use the temperature of the sensitive element in the measured environment to change with the change ...

Examples

Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] control figure 2 , the invention is composed of bridge, comparator, power regulator and compensation circuit. The comparator is connected to the bridge and the power regulator to form a constant temperature control loop. The constant temperature control loop and the compensation circuit are connected in series to a constant current power supply circuit. The constant temperature control loop outputs a detection signal V0, and the compensation circuit outputs a compensation signal V1.

[0019] combine image 3 , The bridge is composed of sensitive element Rm and resistors R1, R2, R3, Rw, Rm is a sensitive element with a catalyst, and the resistance values ​​of R1, R2, R3, Rw are 10Ω, 10K, 10K, 5K respectively. The detection output terminals e and f of the bridge are connected to the input terminal of the comparator U, the output termina...