SU1705849A1 - Device for signaling about deviation of parameters of objects - Google Patents

Abstract

The invention relates to the field of automation and can be used to monitor and control technological parameters and operating modes of objects. The aim of the invention is to improve the accuracy of the device. To do this, the device containing the sensor 1. threshold elements 6 and 7 and the signal unit 8. introduced a two-stage resistive divider 2. elements AND-HF G and 4 and I 5 of the pulse voltage, the invention provides an alarm for the monitored parameter to go beyond the tolerance limits. 2 Il.

Description

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The invention relates to automation and can be used to monitor and control technological parameters and operating modes of objects.

The aim of the invention is to improve the accuracy of the device.

Figure 1 presents the scheme of the proposed device; 2 shows diagrams explaining the operation of the device.

The device contains a sensor 1 of a monitored parameter, a two-stage resistive divider 2, an AND-HE element 3 and 4, a pulse voltage bus 5, threshold elements 6 and 7, and a signal unit 8.

Two-stage resistive divider 2 is made of resistors 9-11.

The device works as follows.

The voltage (fig. 2a) corresponding to the measured parameter, coming from the output of sensor 1 of the monitored parameter, is divided by a two-stage resistive divider (fig. 2a) and compared with the upper thresholds Una of threshold elements 6 and 7. As threshold elements it is advisable to use Schmitte triggers. The resistances of resistors 9-11 of a two-stage resistive divider 2 are calculated by the formulas:

 idn

- () Rn;

Rro (n - 1) Rii- id

where Ufls and Udi are the upper and lower allowable voltage levels of the sensor 1 being determined by the resistance value of the resistor 11.

In this case, if one input of the threshold elements 6 and 7 and the element AND-NOT 3 is supplied with a pulse voltage of the same | level (Fig.26), and the voltage on the other /

The inputs to the threshold elements 6 and 7 exceed the upper response threshold, and pulses are also generated at the inputs of these threshold elements 6 and 7 (Fig. 2B, d, d, respectively). and at the output of the NAND 4 element - the pulses represented in Fig. 2e. That is, when the parameter leaves the permissible limits (t ti and t v.2 of Fig. 2), single ones are formed at the output of the N AND 4 element

impulses that cause the pulsed light of the signal block 8 to glow.

Claims (1)

Invention Formula A device for signaling the deviation of the parameters of objects, containing two threshold elements, the first inputs of which are combined, a sensor and a signal unit, characterized in that increase the accuracy of the device, two elements of NAND, a two-stage resistive divider and a pulse voltage bus are introduced into it, the output sensor is connected to the first output of a two-stage resistive divider, the second and third outputs of which are connected to the second inputs of the first and second threshold elements, the output of the first which is connected to the first input of the first element The NAND whose output is connected to the first input of the second element NAND, the output of which is connected to the input of the signal unit, the pulse voltage bus is connected to the second input of the first NAND element and to to the first input of the second threshold element, the output of which is connected to the second input of the second NAND element, the fourth output of the two-stage resistive divider is connected to the zero potential bus. but 5 b g d e A ppppppppp nnnnrjinnnr A 11 P P P G A In p p p t  Fig 2 11 P P P G In p p p t,