An exhaust sampling system includes a dilution tunnel in which exhaust gas from an engine is diluted with a diluent gas, a sample probe in fluid communication with the dilution tunnel, a sample collector, a first flow path in fluid communication with the sample probe and the sample collector, a source of fill gas, a second flow path in fluid communication with the source of fill gas and the sample collector, and a controller that selectively supplies the diluted exhaust gas to the sample collector through the first flow path during a test phase, and that selectively supplies the fill gas to the sample collector through the second flow path during the test phase. At least a portion of the second flow path is different than the first flow path.

the disclosure discloses a wide-concentration multi-component hazardous gas detector and an implementation method thereof, solving the problems of the existing, technology that false negative results, ultra-limit concentration and sensor poisoning often occur in a gas detector used in fire fighting forces. The wide-concentration multi-component hazardous gas detector includes a gas diluting and sampling connector, a sensor integrated module, electrochemical sensors, ADC (analog to digital converter) circuits, MCU (microprogrammed control unit) single chip microcomputers, acousto-optic alarms, a 4-button keyboard module, an LED (light-emitting diode) display module, an SD card data memory module, a power supply control and electric quantity display module, a high-performance lithium battery pack, a small evacuation pump, 433M signal transmission modules and a remote command platform signal collection terminal.

The purpose of the present invention is to provide an injection apparatus and an injection method for a liquid sample for standard gas production, wherein the injection apparatus for injecting a liquid sample present in a liquid state at room temperature into a standard gas container has an improved structure that minimizes the area in which the liquid sample directly contacts the injection apparatus so as to prevent the problem in which the liquid sample is adsorbed into the injection apparatus. Furthermore, another purpose of the present invention is to provide an injection apparatus and an injection method for a liquid sample for standard gas production, in which a step of volatilizing the remaining liquid sample by heating is eliminated during the injection of the liquid sample, thereby preventing the apparatus from being damaged by heating to thereby improve the durability of the apparatus.

Exhaust gas discharged from an exhaust port is taken into an exhaust gas sampling unit together with the surrounding outside air. A leak detection mechanism, which detects the leakage of exhaust gas from a sampling port, includes a temperature sensor including an outside and an inside temperature sensors, and a temperature measuring instrument for measuring a temperature difference between inside and outside temperatures detected by the temperature sensor. A plurality of inside/outside paired temperature sensors is disposed in the circumferential direction of the sampling port. When a leak occurs, the temperature of the inside temperature sensors rises and the temperature difference between the inside and the outer and outside temperature sensors increases, and the temperature measuring instrument detects the leak. When a leak occurs in a portion of the circumferential direction, only the temperature difference of the portion where the leak occurs is increased, and the location of the leak is identified.

There is disclosed a method of calibrating a gas sensor comprising a luminescent compound having a luminescence lifetime that is quenched by a gaseous substance which uses a model of the relationship between the luminescence lifetime and the concentration of the gaseous substance that is modified by a calibration factor representing a proportion of the compound not being exposed to the gaseous substance, the method comprising: measuring values of the luminescence lifetime of the luminescent compound while the gas sensor is exposed to at least two known concentrations of the gaseous substance; and deriving the calibration factor from the measured values of the luminescence lifetime using the model. Also disclosed are a corresponding gas sensor apparatus for measuring the concentration of a gaseous substance in an environment, and method of measuring a concentration of a gaseous substance in an environment using a gas sensor.

A filter made of a sponge material having air permeability and elasticity is interposed between an exhaust port of an exhaust gas sampling unit and a sampling port to thereby close a gap between the exhaust port and the sampling port. In this state, when the exhaust gas sampling unit is suctioned at a constant flow rate, the exhaust gas and the outside air around the exhaust port are taken into the exhaust gas sampling unit from the sampling port. At this time, the flow rate of the outside air taken in through the filter is suppressed by the air-flow resistance of the filter, and therefore the total flow rate of the exhaust gas and the outside air taken into the exhaust gas sampling unit is caused to be less than the suction flow rate, thereby simply and reliably preventing the exhaust gas from leaking out.

Time until a conductivity meter is ready to measure a conductivity after an electric decationizing apparatus starts is shortened.

Water to be treated that contains cations and anions is supplied to the electric decationizing apparatus while applying a first voltage to the electric decationizing apparatus, and decationized water is generated. Next, the decationized water that is generated by the electric decationizing apparatus is supplied to the conductivity meter in order to measure conductivity of the decationized water. Before the first voltage is applied to the electric decationizing apparatus and before the conductivity meter begins measuring the conductivity of the decationized water, a second voltage that is lower than the first voltage is applied to the electric decationizing apparatus in a state in which the electric decationizing apparatus is charged with water to be treated.

A system that includes a gas sensor, a fresh air flow controller, a sample flow controller, and a system controller. The fresh air flow controller is configured to deliver fresh air to the gas sensor. The sample flow controller is configured to deliver a sample to the gas sensor. The system controller has a processor connected to memory storing instructions that are executable by the processor. When executed, the instructions cause the processor to determine an intermix ratio of the sample to the fresh air, instruct the fresh air flow controller and the sample flow controller to deliver the fresh air and the sample, respectively, to the gas sensor in accordance with the intermix ratio, and receive a sensor reading from the gas sensor after the fresh air flow controller and the sample flow controller have adjusted the fresh air and the sample, respectively.

A monitoring device (1) for a system for generating medical compressed air includes a measured air line (3) removing compressed air from a compressed air supply line downstream of a compressed air conditioning unit. A sensor (2) generates a measured signal as a function of a property of the compressed air fed through the measured air line. A humidifier (8) humidifies the compressed air upstream of the sensor. An output unit (12) outputs information about the property of the compressed air to a user on the basis of the measured signal. A tap (4) removes compressed air and an actuator (5) changes a volume flow and/or mass flow of the compressed air, which volume flow and/or mass flow prevails in the measured air line. The actuator is inserted into the tap in a measuring mode and is removed from the tap in a compressed air removal mode.

This invention is a preparation station for creating a certified reference material. The certified reference material is used to compare the air within an area or room. This is beneficial for identifying if the air within the area contains certain volatile compounds or otherwise undesired compounds. This is accomplished by providing a sealed ampule containing chemical compounds that is eventually broken by the gas preparation device. Once the ampule is broken a gas cylinder the contents are mixed with a diluent gas and forced into a reference material cylinder. The contents within the cylinder are verified and certified for use in testing the air quality of the area or room. Accordingly, with the use of a sealed premade ampule, this invention allows for creating a custom reference material as needed and also eliminates the need for shipping compressed gas cylinders for air quality testing.