DE571818C - Reading mark for examination devices working with pressure or thermometers, especially for gas mixtures - Google Patents

Description

Reading mark for examination devices working with pressure or heat meter, Especially for gas niches In mines, pits, living rooms or the like. Often occurs the case that by penetration or secretion of non-breathable gases such. B. Carbon dioxide, a dangerous lack of oxygen arises. The limit at of people can still live is reached when the air content of the breath drops to 15 Olo oxygen has dropped.

It has now been tried many times to get through this limit Indicators, e.g. B. by taking along chemically, physically or electrically acting Means to be indicated in good time In particular, it is customary if the the dangerous limit of the composition of gas mixtures with the help of electrical Contacts, which are arranged in the pressure gauges or thermometers used for display are to give an alarm signal. However, all of these procedures did not prove successful. either because of their unreliability or because of their awkwardness and the took too long time to complete.

Incidentally, it has already been suggested to use a draft knife for with an artificial draft by means of a sliding pointer on a Scale as a feature for the heater to empirically establish a point that the column of liquid may not exceed or fall below.

Finally, there are movable scales whose zero point corresponds accordingly the examination conditions is set, usually, in particular also with Pressure gauges to take into account the correct zero value of the manometric fluid in a U-tube.

However, some of these facilities concern completely remote ones Areas of work, some of them are too expensive and cumbersome.

The subject of the present invention is now a reading mark for analyzing devices for gas mixtures that work with pressure or heat gauges or the like

The actual gas analysis apparatus consists in a known manner from one equipped with a manometer or thermometer and one with a Oxygen quickly filled with heat-absorbing means, closable Container to hold a certain amount of the air mixture to be tested. as Absorbent can e.g. B. alkaline pyrogallol or sodium hydrosulfite solution to serve.

It is appropriate to proceed according to a known method so that the pyrogallol or sodium hydrosulfite solution in easily breakable capsules 0. Like. Includes them in this envelope in the filled with potassium hydroxide container brings, closes the container, and then shaking the capsule to break it causes. As a result of the immediate absorption of oxygen, a. with more or less heat build-up associated with pressure reduction in the Inside the container.

This pressure reduction or the heat tint can be caused by the pressure or Heat meter can be read.

According to the invention, however, the pressure gauge or the scale Heat meter attached a sliding reading mark, which essentially consists of two the scale resiliently encompassing rings 0. the simultaneous displacement of both rings with one another are connected. The length of this connector becomes empirical through experimentation established. It should be long enough to prevent the rise of the mercury column or the like. a pressure or heat meter for a specific borderline case. As above said, lies e.g. the limit for oxygen in still breathable air is 15 o / o. If you now want to use the device to check whether there is still enough oxygen is present in the breathing air of a room, so one has to do with the construction of the apparatus first to determine by experiments how much the mercury column o The pressure or heat meter increases if air with an oxygen content of 15 0 / o is placed in the device examined. If the mercury column or the like rises, e.g. B. by x mm, one chooses the length of the connector so that the distance between the two Rings is exactly x mm. To measure the oxygen content in a given Space you open the bottle and place the lower ring of the reading mark on the Meniscus of the mercury column or the like in the pressure or heat meter. Then fills the bottle with the room air to be examined, which may be done by blowing it out by means of a rubber ball that sucks in the room air, or in another known way can happen, close the bottle again and then shake it so hard that the capsule 0, which is filled with the reagent solution, breaks. One then observes whether the mercury column rises at least to the top ring. Is that the case, so there is still enough oxygen in the air we breathe.

Of course, the device can also be used to detect other gases, z. B. of carbon monoxide. For example, air causes a certain amount of carbon dioxide contains, when passing through an oxidation catalyst, a certain heat tone, which are measured on the rise of a thermometer embedded in the catalyst Is it possible to determine empirically in this case, too, by how many degrees resp.

Millimeter the silver column with the just permissible content if the amount of carbon dioxide in the air increases, one can then determine the distance between the rings determine. A room air that causes a stronger rise in the thermometer is then no longer to be regarded as breathable. The carrier of the device is thus immediately made aware that a dangerous lack of oxygen will occur begins or that toxic gases are present in harmful quantities. The establishment and The handling of the reading mark is such that even inexperienced people can use it with certainty can handle.

In the drawing, the new device is shown, namely in connection with a device for determining the oxygen in the breathing air.

Fig. I shows one with a pressure gauge and Fig. 2 one with a Heat meter equipped device, while Fig. 3 on a larger scale the sliding Represents the reading mark from the side and seen in a cross section from above.

With a is the vessel containing the potassium hydroxide solution b, with c the light one fragile capsule, e.g. filled with pyrogallol. f is the pressure gauge, on the scale of the movable reading mark g, which consists of the two rings g1 and g2 and the solid middle piece g3 is attached (Fig. I and 3). a Fig. 2 denotes a thermometer, on which in turn the device g is displaceable sits. d denotes a bottle cap, e.g. B. a rubber stopper o.

When using the device, the ring g2 is placed on the meniscus of the Pressure or heat meter set before the reaction, while the ring gt the spot keml shows up to which the Ouecksilbersäule z. B. when checking the oxygen content at least must increase or which they should be when examining for a harmful Gas content of the air must not exceed.

To a. use around the same indicator for different gases to be able to, you can put the connector between the marking rings in his Make the length variable, e.g. B. by placing the top ring on a connector Any length can slide and the distance between the two rings by a micrometer screw or the like. Adjusts the gas mixture to be examined accordingly.

Claims (2)

PATENT CLAIMS: 1. Reading mark for those who work with pressure or heat meters Analysis devices, in particular for gas mixtures, characterized in that that the reading mark consists of two firmly connected by an intermediate piece, the Scale of the pressure or heat meter expediently resiliently encompassing rings or clamps exists, the length of the spacer being determined by empirical tests is adapted to the gas mixture to be examined. 2. reading mark according to claim I, characterized in that. that this Connector is designed to be variable in length, for. B. in that the upper ring is slid on a connector of any length and the distance between the two rings by a micrometer screw or the like. the one to be examined Adjusts the gas mixture accordingly.