DE306095C - - Google Patents

Description

IMPERIAL

■ PATENT OFFICE.

CLASS 42 1 .: GROUP

In the case of gas analysis work, one avoids the variability of the temperature and barometer readings become necessary calculations by using apparatus , used with so-called corfection or reduction tubes are equipped in which a certain temperature and A volume of air corresponding to a certain barometer reading is enclosed which, represents that normal volume to which the gas to be measured before each reading. is reduced mechanically.

Such devices were used by Pe tt er so η (see Hempel, Gasanalytische Methode, 3rd edition, P. 48 and f.) And lungs (see lungs, chemical-technical examination methods, 5th edition, Part I, pp. 158 and f.).

However, both devices do not allow that operating speed to be reached and

do not offer the convenience required to carry out some types of operational checks necessary, are always desired for others.

These requirements are now met in broadest sense of the subject

apparatus constituting the present invention. 'It is different from its predecessors by the fact that this does not happen as with these measuring gas volume itself is adjusted directly to the correction tube, but that the setting by arranging an auxiliary volume Air happens that in ■ ... an uncalibrated Auxiliary pipe is automatically sucked in as it were. . '-. ■ ::; .-., -

The apparatus is illustrated in FIG. Water jacket w contains the gas measuring tube a, the auxiliary s tube b and the correction tube c. The measuring tube α has a cubic centimeter graduation and carries a tap h at the top; the auxiliary srohr b carries a three-way cock t at the top; the correction tube c contains the volume of air brought to the normal state in a known manner. In its lower part it is designed as a mercury manometer m . Measuring tube α and auxiliary tube b are with the level vessel η or another, for loading. Movement of the barrier fluid jointly connected suitable device.

The apparatus is operated as follows:

The gas or gas mixture to be examined is. sucked into the measuring tube a go in a known manner and the valve h closed, while both the auxiliary burette b and the correction tube c are in communication with the outside air through the three-way valve t (position I). Then, with the aid of the level vessel η, set the liquid level in the measuring tube α and the auxiliary tube b to the same level, the gas volumes above it to the external air pressure and then switch the three-way valve t so that the auxiliary tube and the correction tube are shut off from the outside air , on the other hand, are brought into connection with each other (tap position II).

Now raise or lower the level vessel η until the mercury in both sides of the manometer tube m is the same,

with which the air in the auxiliary tube and thus also the gas in the measuring tube to the im Correction tubes set normal state are reduced.

Until today, the movement of the barrier fluid has been effected in apparatuses with correction tubes exclusively through the hydrostatic pressure of a column of liquid, the height of which can be determined by raising or lowering a

ίο level vessel connected by hose changed. Only mercury could be used as the sealing liquid, since it was included Liquids of low specific weight to generate those pressures or Suctions, which are necessary to transfer the gas to the normal state, are very much large lifting or lowering heights of the level vessel would have resulted in a practically usable one Construction of the apparatus in the way

ao stood.

But it has been shown that instead of expensive and uncomfortable mercury one You can also use water or aqueous solutions quite well if you use the previous ones Level vessels replaced by hydraulic pressure and suction devices / such as such for example is shown in FIG.

Claims (1)

Patent claim: Gas burette with temperature and barometer correction, characterized in that a special auxiliary tube (δ) communicating with the measuring tube («) and the leveling device (s) is connected between the gas measuring tube (a) and the correction tube (c), which can be brought into connection with the outside air on the one hand and with the correction tube on the other hand by setting the tap in the appropriate position. 1 sheet of drawings.