SU628408A1 - Level meter testing apparatus - Google Patents

Description

The invention relates to test stands for testing level gauges and, in particular, can be & ted when monitoring the onboard sensors of aircraft fuel gauges on the stand.

Known devices for controlling dates. Chips of level gauges lj, equipped with a tank with a sensor fixed in it. By changing the fluid level in the tank, you can monitor the sensor.

The closest to the invention in its technical essence is a device for testing liquid level gauges containing a level gauge, pipelines for draining and supplying liquid and control bullets 2.

The disadvantages of the known device are insufficient control accuracy and considerable control time.

The aim of the invention is to increase accuracy and reduce control time.

This is achieved by the fact that the proposed device is additionally equipped with comparison units, the number of which is equal to the number of controllable level gauges, serially connected transforms of monitored parameters in the time interval, blocks for selecting the minimum value of the monitored parameter h by a block for selecting the maximum value of monitored napaMerpaj connected between the outputs of the monitored gauges and the inputs of the comparison units, as well as the tolerance shaping unit for the monitored parameter, connected to comparing strokes blocks converters controlled parameters in the time interval and the control panel, the outputs of converters controlled parameters during the time interval are also connected with the other inputs of the comparing unit.

FIG. 1 is a block diagram of the described device for controlling level gauges in FIG. 2 is a specific example of the device.

Claims (2)

With an increase in the number of monitored level gauges, the accuracy of the model parameter being formed increases. The device contains 2 N - 1 controlled level gauges 1; 2 1 converters 2 monitored pairs of meters in a time interval, blocks 3 select the minimum value of the monitored parameter for N inputs each, block 4 select the maximum value of the monitored parameter, 2 N - 1 comparison blocks 5, the control panel 6 in block 7 forming the tolerance on the controlled parameter. The outputs of the monitored level gauges 1 are connected to the first inputs of the corresponding converters 2, the second inputs of which are connected to the control panel, 6. The inputs of the blocks at the set of the minimum value of the monitored parameter 3 are combined into groups according to the number of converters of the monitored parameters in the time interval and connected to the outputs of the corresponding generators 2 controlled parameters in the time interval, We take the connection of the converters & 2 to the inputs of blocks 3. Denote the converters 2 П | , and 1, blocks 3, 5Jl.i2 --- i l il732-iN.2N-i; JifJ2 ... il |. The combination of the indices J i, p-1N PR® is one of the combinations of (2 -1) numbers in N, and the total number of 3 bites is defined by the formula Cgy. j) D output of the block (1 i is connected to the inputs of those blocks 1B c, 52 ... j |, for which I ", where K I, N, Outputs of the block of selection of the maximum value of the controlled parameter 4 are connected to the Outputs of the blocks of selection of the minimum value of the controlled parameter 3. The first inputs of the comparison block 5 are connected to the outputs of the corresponding transducers of monitored parameters in time interval 2, the second inputs are connected to the output of the block for selecting the maximum value of the monitored parameter 4, and the third to the output of the tolerance shaping block 7 Controlled parameter. The output of the latter is connected to the control panel 6. Consider a specific example of the device. The block diagram of the ycTpoi is shown in FIG. 2. The device contains five monitored parameter converters during the time interval, ten blocks 3 for selecting the minimum value of the monitored parameter three inputs each, block 4 for selecting the maximum value of the monitored parameter, five comparison blocks 5, control panel 6 and block 7 for forming the tolerance for the monitored parameter 7, Transducers 2, which They are started with a signal from the control panel 6 and convert the output signals of the monitored level gauges 1 into a time interval. The converted signals are fed to the corresponding groups of blocks 3. Each of the blocks 3 selects the minimum of the three signals received at its inputs. The signals from the outputs of block 3 are fed to the inputs of block 4, which selects the maximum of them. Thus, in blocks 3 and block 4, the signal taken as exemplary is selected. In comparison blocks 5, differences are formed between the signal from the output of block 4, taken as exemplary, and the signal from the output corresponding. converters 2. The resulting ratios are compared with the tolerance on the monitored parameter. The signal proportional to the tolerance on the monitored parameter comes from the output of block 7, which is triggered by a signal from the control panel 6. As a result of the comparison, it is possible to decide whether or not each of the monitored gauges is suitable or not, for the KOHTW, the role of the gauges during the monitoring process is exemplary high accuracy parameter. Thus, five level gauges with a rms deviation of their parameters L 1% are controlled, the rms error of a parameter taken as exemplary is 0, O67%, i.e., 15 times less than the standard deviation of the monitored parameters. Such a correlation of these values satisfies the accuracy requirements of exemplary and controlled parameters. The formation in the process of control of an exemplary parameter of twisted accuracy increases the reliability of the control. This will also make it possible to refuse to create accurate reading devices for the level of fluid filling presently available in all test benches. In addition, by simultaneously monitoring several gauges and automating the control operation, the time taken to control the gauges is reduced. Apparatus for controlling level gauges containing a container, drain and supply pipelines and a control panel, characterized in that, in order to increase accuracy and reduce control time, it is additionally equipped with comparison units, the number of which is equal to the number of level gauges being monitored, successively coennHehmbiMH converters the monitored parameters in the time interval, the units for selecting the minimum value of the monitored parameter and the unit for selecting the maximum value of the parameter being monitored pa connected between the outputs of the controllers of the level gages and the inputs of the comparison units, as well as the unit forming the tolerance for the monitored parameter connected to the inputs of the comparison units, the transducers of the monitored parameters during the KieHHoft interval and the control panel, the outputs of the transducers of the co-rotatable parameters during the time interval also with other entrances of the blocks compared, Sources} 1nformann, pryu into account with the expert: 1. Authors svdedetstvo USSR N 380963, kp. G O1 F 25/00, 1971. 2, USSR Copyright Certificate No. 352145, cl. G O1 F 25/00, 197O.