Ad
related to: puebi detector tester model m 509gm free standing 30 inch gas range back view
Search results
Results from the WOW.Com Content Network
The photoionization detector is an efficient and inexpensive detector for many gas and vapor analytes. PIDs produce instantaneous readings, operate continuously, and are commonly used as detectors for gas chromatography or as hand-held portable instruments. Hand-held, battery-operated versions are widely used in military, industrial, and ...
A gas detector can sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave. This type of device is important because there are many gases that can be harmful to organic life, such as humans or animals. Gas detectors can be used to detect combustible, flammable and toxic gases, and oxygen depletion.
Whereas the natural units of measurement for an Infrared point sensor are parts-per-million (ppm) or the percentage of the lower flammable limit (%LFL), the natural units of measurement for an open path detector are ppm.metres (ppm.m) or LFL.metres (LFL.m). For instance, the fire and gas safety system on an offshore platform in the North Sea ...
In order to analyse the concentration distribution present in the sensor tube, a pump pushes the column of air in the tube past a detection unit at a constant speed. The detector unit at the end of the sensor tube is equipped with gas sensors. Every increase in gas concentration results in a pronounced "leak peak". [6] [25] [26]
All of these have the same basic design of two electrodes separated by air or a special fill gas, but each uses a different method to measure the total number of ion-pairs that are collected. [1] The strength of the electric field between the electrodes and the type and pressure of the fill gas determines the detector's response to ionizing ...
The machine operates by releasing multiple puffs of air at a passenger who is standing upright within the machine. This will flush out any particles on the person inside the machine then analyze and identify them in seconds. [5] According to an article in the 16 June, 2005, New York Times, it is capable of screening up to 180 passengers an hour ...
The model is lightweight and water resistant, with an LCD display and a plastic case, along with miniature Geiger tube (shielded against beta particles), on a single, EMP-hardened, PCB. The PDRM was able to measure radiation dose rate in the range of 0.1 to 300 centiGrays. It was designed by Plessey to use three standard 1.5 volt cells, and is ...
The efficiency of the chamber can be further increased by the use of a high-pressure gas. Typically a pressure of 8-10 atmospheres can be used, and various noble gases are employed. The higher pressure results in a greater gas density and thereby a greater chance of collision with the fill gas and ion-pair creation by incident radiation.
Ad
related to: puebi detector tester model m 509gm free standing 30 inch gas range back view