DE6609410U - DEVICE FOR MONITORING THE GAS FLOW IN GAS ANALYZERS. - Google Patents

Description

Fcten'r-nvvMite
Dr. Lunatic · ■. - «

2 ■ »■" ■% * · VV..Si- ie. .- "·

M 47 660/42 1 Gbm.
Η »Maihak AG.
2 Hamburg 39
Sendererstr. 38

contraption

for monitoring the gas flow in gas analysis

equipment

For monitoring the gas flow in continuously operating A device has been proposed for gas analyzers which is characterized in that the changes in the gas line caused by disturbances in the gas flow existing pressure differences can be used to operate a signaling and recording device. Signaled In this way, all blockages in the gas line and the failure of the dex · gas pump are eliminated.

The disadvantage of such devices is that they also respond, i.e. signal a "fault" in the gas flow., if the analyzer is offered more gas than the gas pump built into the device can extract. For such gas monitoring devices, this state is equivalent to a blockage of the G outlet line. Because an overpressure arises in the device both when the gas outlet line is blocked and when one for the Gas pump too much gas in the gas inlet line. The signaling of this "pseudo" disturbance is undesirable, however. Because an oversupply of gas at the gas inlet of the device does not affect the gas analysis. It exists so there is no reason to call this state a "disruption of the" gas flow " address and signal.

- 2. -

Devices of the proposed type for monitoring the gas flow therefore require to avoid such undesirable Fault signaling that the gas supply to the analyzer is always dosed in such a way that the device never more gas is offered than the gas pump built into the device can extract,

The present invention overcomes this drawback of such monitoring devices for the gas flow in continuously working analysis devices.

In contrast to the proposed monitoring devices, which are based on changes in the gas pipeline Responding to pressure differences, i.e. to secondary phenomena of the gas flow, the device according to the Invention actuated directly by the disturbed gas flow «

According to the invention, there is a device in the device provided, which when the speed of the gas flowing through the analyzer falls below a minimum Via a photo-electric one controlled by the gas speed Light barrier actuates a signaling and / or registration device *

The gas velocity falls below a certain minimum if the gas lines of the analyzer are partially blocked or if the delivery rate of the gas pump is reduced. The gas velocity drops to the Hull value if the gas line is completely blocked or if it fails completely the gas pump.

In these cases, in the preferred embodiment of the device according to the invention, the gas velocity-dependent one takes place Control of the light barrier via a beam path of the light barrier brought into the gas flow if the gas velocity minimum is not reached interrupting opaque float.

The desired minimum gas velocity is determined according to the invention by the number of weight or dimensions

the opaque float is set. Pure The float weight becomes the low minimum speed very small and / or the "piston clearance" between the float and the pipe wall chosen to be very close - for one higher desired minimum speed, weight and / or piston clearance correspondingly larger »

According to the invention, the monitoring of the gas flow in analyzers is characterized in its basic device structure marked that in the gas line of the analyzer a translucent, preferably as vertical as possible, through which the gas stream flows from bottom to top Pipe section is installed, which contains an opaque float and in a photo-electric Light barrier is inserted.

In an exemplary embodiment, this is shown in FIG Gas line intermediate pipe section characterized in that it has a cylindrical shape unc / in its upper Part of a gas line shunt a: ti dex * point arranged is at which the float hovers for a certain desired gas velocity.

In a preferred embodiment, the light-permeable pipe section interposed in the gas line is characterized in that it has a cylindrical shape in its lower part and a conical shape in its upper part.

The inventive cylindrical design of the lower Pipe part causes a fast, not speed proportional Raising the floating body from the rest position ' even with the slightest gas flow, while the conical upper; Pipe section ensures a largely speed-proportional float position of the float.

The light-permeable pipe section interposed in the gas line of the analyzer is also after the Invention characterized in that limiting stops for the float are provided in it above and below that affect the floating position of the float

limit and that there is a gas velocity set point marker Has.

The invention is to be further explained, for example, on the basis of the drawings. They represent:

Figure 1 shows an exemplary embodiment of the Device with a cylindrical pipe section;

Figure 2 shows a preferred embodiment of the device with a conical pipe section.

via the outside of the gas analyzer Gas sampling point 1, the gas connection line 2 and the Gas filter 3, the gas to be analyzed enters the analysis part 4 of the device and then flows through the Device according to the invention with the translucent pipe section 5, in which the float 6 from the gas flow in the Levitation is held. The dashed line drawing of the float 6 shows its position in the gas flow Zero. Limiting pins 7 and 8 attached in the tube 5 limit the floating position of the float in the tube The parallel to the translucent pipe section 7 gas line shunt 9 is arranged at the point at which the float for a certain desired gas velocity floats

The light barrier controlled according to the invention by the gas speed is formed by the light source 10, the rays of which fall through the optics 11 through the translucent -fcohr 5 onto the light-sensitive receiver 12, the The display and registration device 15 and / or the signal system 16 via the switching amplifier 13 and the relay 14 actuated.

The embodiment according to Fig, 2 differs from the embodiment according to Fig "1 only in that instead of the cylindrical translucent pipe section 5, a pipe section occurs which is cylindrical only in its lower part 17, in however, the part 18 continuing upward is conical.

Claims (4)

PROTECTION CLAIMS 1. Device for monitoring the gas flow in continuously working gas analyzers, characterized in that in the gas line of the Ajia— lysis device a translucent, preferably if possible vertical pipe piece, through which the gas stream flows from bottom to top, is installed, which has an opaque pipe Contains float and is inserted into a photoelectric light barrier. 2. Apparatus according to claim 1, characterized in that the interposed in the gas line Pipe section has a cylindrical shape and in its upper part a gas line shunt is arranged at the point is at which the float hovers for a certain desired gas velocity. 3. Apparatus according to claim 1, characterized in that the interposed in the gas line translucent pipe section in its lower part z 'cylindrical and in its upper part conical shape Has. 4. Device according to the preceding claims, characterized characterized that in the translucent pipe section above and below limit stops for the Floats are provided that limit the floating position of the float. 5o device according to the preceding claims, characterized characterized in that the translucent tubing has a gas velocity set point marker.