Method for wide range gas detection using a gas detection system comprising a sample gas inlet, a reference gas inlet, a gas modulation valve and a gas analyzer, wherein the gas modulation valve alternatingly connects the sample gas inlet to the gas analyzer during a sample gas time period and the reference gas inlet to the gas analyzer during a reference gas time period, characterized in that the sample gas time period is shorter than the reference gas time period such that the sample gas concentration in the gas analyzer is reduced.

A biological gas detection device acquires a reference output value that is an output value outputted from a semiconductor gas sensor in a reference air sample, the semiconductor gas sensor having sensitivity to an interfering gas and a target gas contained in a biological gas, acquires a target gas concentration that is a concentration of the target gas measured based on a first output value, the first output value being outputted from the semiconductor gas sensor during measurement of the biological gas, corrects the target gas concentration based on a second output value and the reference output value, the second output value being outputted from the semiconductor gas sensor in an air sample prior to measurement of the biological gas; and outputs information according to the corrected target gas concentration.

Gas detection devices comprise a dehydration unit a concentration unit, and a temperature control unit for controlling a temperature. The gas detection device includes a sampling mode in which sample gas flows into and out of the dehydration unit through a first port and a second port, respectively, wherein the volatile organic compounds in the sample gas are concentrated in the concentration unit. The temperature control unit may be configured such that the temperature of the sample gas after flowing out from the dehydration unit and before flowing into the concentration unit is not greater than a first preset temperature. Generation of condensed substances in the sample gas can be effectively avoided in a simple manner after the sample gas flows into the concentration unit, thereby further preventing ice blockage. Methods for detecting volatile organic compounds in a sample gas are also disclosed.

A device may include a memory storing instructions and a processor configured to execute the instructions to obtain a research octane number for a sample; perform a combustion test for the sample in a constant volume combustion chamber; and record, at time points during the combustion test, pressure values. The processor may be further configured to calculate values for one or more pressure parameters for the sample based on the pressure values; generate a research octane number function for the constant volume combustion chamber based on the determined research octane number and the calculated values for the one or more pressure parameters; and use the generated research octane number function to determine research octane numbers for samples using the constant volume combustion chamber.

Sniffing leak detector including a handheld device with a sniffer tip probe including a sample gas inlet, a reference gas inlet, a gas analyzer, and a switching valve adapted to alternatingly connect the sample gas inlet to the gas analyzer and the reference gas inlet to the gas analyzer in a gas conducting manner, such that either the gas drawn through the sample gas inlet or the gas drawn through the reference gas inlet is analyzed by the gas analyzer, characterized in that the reference gas inlet is arranged in a remote distance from the sniffer tip probe and a reference gas conduit connecting the reference gas inlet and the switching valve includes a buffer chamber adapted to homogeneously mix gas drawn into the buffer chamber through the reference gas inlet with the remaining gas in the buffer chamber.

Described is a method for quantifying the amount of optically interfering gas impurities in a gas detection system comprising a sample gas inlet, a reference gas inlet, a gas modulation valve, and an infrared absorption gas detector used for analysis of methane or natural gas, wherein the gas modulation valve alternatingly connects the sample gas inlet to the gas detector during a sample gas time period and the reference gas inlet to the gas detector during a reference gas time period. The method includes measuring an infrared absorption for at least two different sample gas concentrations in the gas detector achieved via respective different ratios from the sample gas time period and the reference gas time period, and comparing amplitudes of different measurement signals of the at least two different sample gas concentrations with calibration functions to assess an actual gas impurity concentration in the sampled gas.

A gas analysis system and method using a spectrometer, such as a Fourier transform infrared spectrometer, utilizes a reactor, such as a catalytic reactor, for providing interference spectra. The gas is pressurized and chilled to remove water prior to the spectrometer.

The system and method described herein enable generating digital product labels for products that are valued by weight. Product identification data of a product is received via at least one of a user interface and a network interface. Value per weight data of the product is obtained from a product data store via the network interface. A weight value is determined from at least one scale device via the network interface and a product value is calculated based on the obtained value per weight data and the determined weight value. A digital product label is generated, including at least a portion of the product identification data and product value. The disclosure provides systems and methods that use multiple modular devices, such as the scale devices, printers, and product attribute collector devices, that provide flexibility in organizing the system and reduced cost in initial setup and replacement of devices in the system.

A gas detection system, comprising a sample gas inlet, a reference gas inlet and a gas modulation valve alternatingly connecting one of the sample gas inlet and the reference gas inlet to a gas sensor, is characterized in that a selective transfer filter is located in the gas flow path connecting the gas modulation valve and the gas sensor.

An objective of this invention is to conduct an accurate quantitative analysis on the Ar element contained in a sample gas by an element analysis device comprising a heating furnace and a mass spectrometer for conducting a quantitative analysis on an element in a vacuum atmosphere. The element analysis device comprises: a heating furnace that heats a graphite crucible containing a sample while introducing a carrier gas into the heating furnace, thereby vaporizing the sample to generate a sample gas; a quadrupole mass spectrometer that conducts the quantitative analysis on the Ar element contained in the sample gas in a mixed gas comprising the carrier gas and the sample gas discharged from the heating furnace, a first pressure regulator that controls the pressure of the carrier gas to be introduced into the heating furnace, and a second pressure regulator that controls the pressure of the mixed gas discharged from the heating furnace.