DE157986C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 157986 CLASS 42 k.

MAX ARNDT in AACHEN. Voltmeter for gases.

Addendum to patent 99193 of June 20, 1897.

Patented in the German Empire on December 17, 1903. Longest duration: June 19, 1912.

In the case of the voltmeter for gases protected by patent 99193, the connection of the liquid container d ¹ to the room, the overpressure or underpressure of which is to be measured, is made by a resonating hose g, which can easily influence the measuring accuracy and which also needs to be renewed frequently. Furthermore, if the liquid k rises excessively in the container d ^{l, it can get} into the hose g or the like and thereby cause malfunctions in the instrument.

The present invention now aims to overcome these disadvantages. This happens because the balance α is arranged to oscillate in a resistance-free liquid seal g ² g * and the liquid seal communicating with the latter, the liquid

ao tank d ¹ d ' pipe connecting above / ^l inside the liquid tank d? an extension / ² is given, which prevents the excessive rise of the measuring liquid k in the container d ^l.

Fig. Ι and 2 show the instrument as a draft knife in longitudinal section and in cross section, Fig. 3 as a pressure gauge in longitudinal section.

As in the main patent 99193, the two containers d ¹ and d ^{2 of} the measuring liquid k communicate through a tube e which carries the pointer c oscillating in front of the scale I.

The balance beam α is formed from the upper connecting pipe / \ the pipe g ^s carrying this and the chamber g ² carrying the latter, which for example oscillates between two points b in the liquid container g · ⁴ . The latter is fixed to the pressure pipe g \ which is connected to the room whose gas voltage is to be measured. At the same time, the tube g ¹ can serve as a stand for the instrument.

In the container g · ⁴ there is the barrier liquid k ^l , the liquid level of which is so far surpassed by the pipe g ¹ that it cannot overflow into this at a certain maximum gas tension. The chamber g ² is open at the bottom in order to be able to swing freely around the pipe g ¹ , and the barrier liquid k ^{1 is} immersed in it.

The extension of the tube / 'protrudes so deeply into the measuring liquid k in the container d ² that its mouth only becomes free when the tensile strength exceeds the maximum permissible for the instrument.

On the tube / ¹ there is the capsule / ³ , into which the tube g ^a protrudes so far that the measuring liquid k does not pass through the tube g ^s into the other when it passes from one of the two containers d ^l or d ^{2 into the other} Can get container g *.

The measuring liquid k is filled through the funnel i, which is open to the atmosphere.

The effect of the instrument as a draft knife is as follows:

The depression in the space connected to the pipe g ¹ extends through this to the chamber g ¹ , the pipe g ³ , the pipe f ¹ and the liquid container d ¹ , the liquid k ¹ in the chamber g and the liquid k 1 in the pipe f ² the liquid k rises proportionally to the tensile strength. Simultaneously

ίο the measuring liquid k is sucked from the container d ' ² through the tube e into the container d ¹ and thereby shifts the center of gravity of the instrument so that it rotates around the tips b and the pointer c on the scale I shows the difference in height Columns of liquid in the containers d ^l and d ² in millimeters of water column indicates that the respective depression maintains the equilibrium. If this depression exceeds a certain size, for example 30 mm water column, the mouth of the tube f ² is released from the bottom of the measuring liquid k and allows outside air to enter, which prevents any further increase in depression within the instrument. The amount of liquid moving in the immersion tube f ' ² during the operation of the gas tension meter is taken into account when dividing the scale /.

As a pressure gauge - for the purpose of reading of the scale as shown in Figure 2 from left to right -.. The instrument reverse of Figure 3 executed the dip tube f ^'2, therefore, in the container ¹ laid d, which then

also carries the open hopper i. About- | In this embodiment, the gas voltage overpressure rises above the atmosphere by a certain amount, e.g. B. 30 mm water column, the pressure medium (the tensioned gas, air, etc.) comes out of the immersion tube f ² , through the measuring liquid k through, from the container d ^l into the atmosphere, thus does not allow a maximum pressure in the instrument to be exceeded .

Claims (3)

Patent Claims: 1. Voltmeter for gases according to patent 99193, characterized in that the two liquid containers (d ^l d " ² ) are connected at the top by a pipe ff ¹ J , which branches off from the one closed container (d ^l or d ' ² J into the Another container open to the atmosphere with an extension ff ' ² J is inserted so deep that it remains shut off by the measuring liquid (k) until a certain maximum gas tension occurs, then either outside air enters when measuring negative pressure or allows gas to escape when measuring overpressure. 2. Voltmeter "for gases according to claim 1, characterized in that the connecting pipe ff ¹ ) communicates with the fixed pressure pipe (g ¹ ) through a hydraulically shut-off pressure chamber fg ' ² , which oscillates with the instrument around the latter, whose attachment pipe (g ^a j so protrudes into the connecting pipe (f ¹ ) that the measuring liquid (k) from one of the containers (d ¹ or d ' ² ) cannot get into the container fg ⁴ ) of the barrier fluid fk ^] ) for the pressure line fg ¹ ) . 3. Voltmeter for gases according to claim 1, characterized in that on the connecting pipe ff ¹ ) a chamber-like extension (f ^a ) for receiving the upper mouth of the extension pipe fg ³ ) is arranged for the purpose of overflowing the measuring liquid (k) in to safely prevent the pipe at this point. 1 sheet of drawings.