Gas tester

The person testing the atmosphere inside the confined space must be properly trained. He or she must know the use, limitations, calibration, and inspection of testing equipment and must also understand how conditions inside the space could affect the reliability and calibration of the testing equipment. 

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Gas-pfeife, /. gas pipe, -pressuag, /. gas pressure. -probe, /. gas test gas testing gas sample, -priifer, m. gas tester eudiometer, -quelle, /. gas well, -raum, m. gas volume, volume of gas. 

Fact 1 There is a telegram of February 26, 1943, by means of which heating technician Jahrling of the Topf Sohne oven construction firm orders 10 Gas testers for crematorium II. 

Correct conclusion According to the technical literature, Gas testers are flue gas analyzers intended to determine the exhaust gas composition of oven gases.238 Such devices were standard equipment in crematoria. That the above mentioned order referred to such devices is clear from the fact that they were ordered by a heating technician from an oven construction firm. The letter in reply from the Topf corporation dated March 2, 1943, stating that one must first find out who marketed these devices, has been revealed on several occasions to be an absurdity 239... 

Furthermore, these detection devices are based on a wet chemical method which possessed no indicator and could not, therefore, be designated as indicator devices. On the other hand, the gas testers mentioned in the telegram had a physico-chemical sensor connected to a dial (see Fig. 35). 

Fig. 35 Photograph of two indicator devices from the Siemens corporation for the CO2 and/or CO+H2- gas content in %. Component of a gas tester.240...

Two methods are used to measure and monitor entrained air in a stock system compression and ultrasonics. Many different types of mechanical compression apparatus have been used in the pulp and paper industry (Woodworth, 1990). The portable Entrained Gas Tester (EGT) is one device that is commonly used to profile stock systems by determining the level of entrained air in a stock at a particular sample point. The EGT operates on a mechanical compression technique based on Boyle s law of gases. The operation of the EGT is described in detail in the manufacturer s manual. Advantages of the portable EGT are that the test is quick to carry out and the test unit is compact and portable, allowing the user to conduct the test at-location. However, this test is very operator-sensitive and there can be high variability of data in addition to a time delay before results become available. 

T/F) The LEL function on a gas tester will not work if enough oxygen is not present. 

For a quantitative determination in large-scale chemical processing, automatic gas level sensors, such as the OLDHAM-GZ-ARRAS (France) M/42, having a four-channel programmable alarm system, are used [19]. Electrochemical phosgene detectors (0.1-3.0 ppm) and handy pumps with phosgene tubes (AUER GAS-TESTER II) (from 0.1 ppm) are also employed. 

The user of any instrument should be thoroughly familiar with precautions to be taken in its operation users of combustible gas indicators must also be aware of interfering gases and vapors which can create major aberrations in instrument response. One such precaution is that the 0-to-100% scale should be used first, to determine whether an explosive atmosphere exists and to prevent overloading to O-to-10% LEL scale. For example, note the typical meter responses to methane gas shown in Figure 17, particularly those at the LEL, in the explosive range, and above the UEL. If the pointer of the meter travels into the red portion of the scale and remains there, an explosive concentration is present. However, if the pointer climbs rapidly to the red area and then falls back to zero, there is either a concentration above the UEL or a gas mixture which lacks sufficient oxygen to support combustion. Whatever the reason, if the pointer touches the red portion of the scale, the gas tester should leave the area immediately. 

Permeance of a fluid through thin films is governed by the mass-transport principles as discussed in Section 8.1.5. These laws are employed in a typical gas tester to determine... 

Modem electronic replacements for the Orsat apparatus include equipment manufactured in the United States by Bacharach, Inc. (www.bacharach-inc.com). This company produces handheld and boxed instruments that can be employed as comprehensive combustion and environmental analyzers, gas burner combustion testers, single gas analyzers, draft gauges, smoke test sets, sling psychrometers, and the like. 

The principal input and output tests used by the US at the time of publishing NOLTR 1111(1952) included Drop Ball Testers (two types) Sand Bomb Apparatuses 100, 200, 360 500 gram Condenser Discharge Apparatus Torsional Ballistic Pendulums (two types) Drop Ball Test Set Mk 135 with Chronograph Thermocouple Drop Ball Test Set Mk 136 with Chronograph Gas Explosion Chambers (two types) Gas Volume and Impulse Apparatus Pressure Bomb Apparatus and Hopkinson Bar Apparatus (Ref 11, pp 9-2 9-3, Table 9-D... 

The halogen leak tester is widely used in refrigeration applications, but it is sufficiently sensitive for many types of chemical vacuum systems. The apparatus is filled with a halogenated hydrocarbon and the probe of the tester is passed over the suspected area. The gas that is collected by the probe is passed over a hot platinum wire with the resulting formation of positive ions which are collected and measured with a microammeter. 

Holgate HR, Webley PA, Tester JW. Carbon monoxide oxidation in supercritical water the effects of heat transfer and the water-gas shift reaction on observed kinetics. Energy Fuels 1992 6 586-597. 

Holgate, H.R. Webley, P.A. Tester, J.W. CO in Supercritical Water The Effects of Heat Transfer and the Water-Gas Shift Reaction on Observed Kinetics Energy Fuels, 6 (1992) 586-597. 

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