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51results about How to "Satisfactory sensitivity" patented technology

Flow rate measuring method and flowmeter, flow rate measuring section package used for them and flow rate measuring unit using them, and piping leakage inspection device using flowmeter

Measurements are obtained by a computing unit based on an output Vh from an indirectly-heated constant-temperature controlling flow rate measuring section (16) and an output Vout from a two-constant-point temperature difference detecting flow rate measuring sections (18a, 18b). In the flow rate measuring section (16), a heating element (163) is feedback-controlled based on a detected temperature by a heat sensing element (162) to obtain an output Vh based on the feedback-controlled condition. An output Vout is obtained from flow rate measuring sections (18a, 18b) based on the detected temperature difference between a heat sensing element (182) disposed on the liquid-flow-direction upstream side of the flow rate measuring section (16) and a temperature sensing element disposed on the downstream side. A computing unit outputs as a measurement a flow rate obtained based on the output Vh in a flow rate region where a flow rate is larger than a predetermined boundary flow rate, and outputs as a measurement a flow rate obtained based on the output Vout in a flow rate region where it is less than a boundary flow rate. Accordingly, a flow rate is measured with good precision and sensitivity over a wide flow rate range from a trace-amount flow rate region to a comparatively large flow rate region.
Owner:SAN-A

Method for measuring glycol ether substance in package paper for cigarette

The invention provides a method for measuring a glycol ether substance in package paper for a cigarette. The method specifically comprises the following steps of 1), preparation of a test sample; 2), preparation of a standard sample; 3), sample detection: subjecting the test sample and the standard sample to head space-gas chromatographic/mass spectrometric measurement respectively, so as to obtain total ion current chromatograms and selected ion chromatograms of the test sample and the standard sample; 4), qualitative analysis: by using retention time and a fragment ion peak of the glycol ether substance in the total ion current chromatogram of the standard sample as references, determining the glycol ether substance existing in the test sample; 5), quantitative analysis: establishing a standard working curve through the content of glycol ether in the standard sample and the selected ion monitoring chromatogram of the standard sample, and carrying out quantification by an external standard method, so as to obtain the content of the glycol ether substance in the test sample. The method for measuring the glycol ether substance in the package paper for the cigarette, which is provided by the invention, is high in sensitivity and good in repetitiveness and recovery rate; an effective technical means is provided for the qualitative and quantitative analysis of the glycol ether substance in the package paper for the cigarette.
Owner:SHANGHAI TOBACCO GRP CO LTD
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