JP2002062210A - Differential pressure-pressure transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate the cause of an error by a display shape by optionally setting the display shape at time of error in a differential pressure-pressure transmitter. SOLUTION: In this differential pressure-pressure transmitter having the output setting function and/or the self-diagnosable function at time of error besides the function of transmitting differential pressure and pressure by converting the measuring different pressure and pressure into an electric signal, an error output value of this differential pressure-pressure transmitter and/or the display shape of an output pattern can be optionally set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential pressure / pressure transmitter, and more particularly, to a differential pressure / pressure transmitter having an output setting function and a self-diagnosis function at the time of an error, wherein the error output value is used by a user. The present invention relates to a differential pressure / pressure transmitter provided with a function capable of setting in detail from an error output to a determination regarding continuation / stop of plant operation by user's will in advance by enabling the user to set any value.

[0002]

2. Description of the Related Art The self-diagnosis function of a differential pressure / pressure transmitter according to the prior art allows the self-diagnosis information to be given to internal communication parameters at the time of an error or to be displayed on a built-in indicator, thereby enabling the type of error to be determined. It has a function to notify the user. The function of notifying the user is shown in FIGS.
As shown in FIG. 7, the output signal of the transmitter is represented on a time axis. For example, as shown in FIG. The signal that has been shaken off is displayed as an error output signal. Also, as shown in FIG.
A signal which is less than 0% and minus 5% of a normal output signal near 0% is displayed as an error signal output signal.

As shown in FIG. 2, when an abnormal output signal is generated with respect to a normal output signal in which the output signal of the transmitter is close to 30%, a normal output signal at the time when the abnormality occurs is generated. The output hold signal that holds the output signal is displayed.

[0004]

However, in the above-mentioned prior art, since the type of error cannot be determined from the output value or the output trend data, continuation and stop of the plant operation are determined based on this. Even if there is no serious failure or there is no failure in the transmitter itself, the plant may be emergency stopped based on the error output of the transmitter. In this case, the cause of the failure is not clear, and at the same time, the user has an enormous loss for improvement and restart. Further, if the value immediately before the occurrence of the abnormality is held and displayed, it is difficult to distinguish between the output at the time of the error and the normal output.

Therefore, when an error occurs during measurement of the differential pressure or the pressure, there is a problem to be solved in a notification form in which the type of the error can be visually identified.

[0006]

In order to solve the above-mentioned problems, a differential pressure / pressure transmitter according to the present invention has the following configuration.

(1) A differential pressure / pressure transmitter having an output setting function at the time of an error and / or a self-diagnosis function in addition to a function of converting a differential pressure and a pressure to be measured into an electric signal and transmitting the electric signal. And the error output value of the differential pressure / pressure transmitter and / or
Alternatively, the display form of the output pattern can be arbitrarily set. (2) The differential pressure / pressure transmitter according to (1), wherein a display form of the error output value and / or the output pattern is differently displayed depending on the type of error.

As described above, the output value at the time of occurrence of an error is selected and displayed from a display form set in detail according to the user's intention. Can be determined by looking at the characteristic display contents. This makes it possible to prevent an emergency stop of the plant that is not intended by the user, and it is possible to minimize the loss on the user side.

[0009]

Next, an embodiment of a differential pressure / pressure transmitter according to the present invention will be described with reference to the drawings.

A differential pressure / pressure transmitter according to the present invention, as shown in FIG. 1, detects a differential pressure and a pressure to be measured.
A pressure detection unit 110 and an electric signal conversion unit 120 that converts a signal detected by the differential pressure / pressure detection unit 110 into an electric signal.
And a signal output unit 1 for transmitting a signal converted into an electric signal
30 and an output signal display section 140 for displaying a signal to be output
And a self-diagnosis unit 150 for diagnosing the transmitter itself. The output signal display unit 140 displays the output signal as a percentage along the time axis, sets an output according to the error mode, and allows the user to arbitrarily set the display mode of the output pattern. It has.

The user can arbitrarily set a display mode in which the output value at the time of an error can be arbitrarily set by the user or can be selected from a prescribed output value. They are prepared and selected from them according to the abnormal signal. Alternatively, an output value and an output pattern are arbitrarily assigned according to the type of error.

First, the one in which the user can arbitrarily set the output value at the time of error or select the output value at the time of error from the prescribed output value, as shown in FIG. Prepare more than one. In the case of the embodiment, the specified set value 1 is “+ 110% swing-out”, the optional set value 1 is “+ 90% hold”, and the optional set value 2 is “+65”.
% Hold ", the specified set value 2 is" + 50% hold ",
The optional set value 3 is “+ 25% hold”, the optional set value 4 is “+ 10% hold”, and the prescribed set value 5 is “−5% swing out”. As described above, a plurality of values to be held are set in advance, and when an abnormal signal is generated for a normal output signal near 30%, a set value corresponding to the generated abnormal signal is held. I just need.

The pattern output by error type is as follows.
As shown in FIG. 3, the type of the pattern is changed according to the magnitude of the abnormal signal at the time of the error. In the embodiment, an abnormal signal of approximately 80% (error 1)
, A waveform output A in the form of a wave, a pattern output B in the form of a rectangular wave in the case of an abnormal signal near 70% (error 2), and a pattern output in the form of a sine curve in the case of an abnormal signal near 50% (error 3). C. As described above, when the output display is expressed in a predetermined pattern in accordance with the magnitude of the abnormal signal, the magnitude of the abnormal signal can be visually recognized in the pattern.

According to the type of the error, the output value and the output pattern are arbitrarily assigned as shown in FIG.
A predetermined pattern (pattern 1 to pattern 3) is assigned based on an error type (error 1 to error 5) and an error output value (output 1 to "output 5"). 1, error 2 and output 2, error 5 and output 5 are set to pattern 1, error 4 and output 4 are set to pattern 2, and error 3 and output 3 are set to pattern 3.
In this way, the abnormal signals can be accumulated in advance, and if the specific pattern is a specific pattern, the seriousness of the abnormal state can be easily determined visually.

[0015]

As described above, in the pressure / differential pressure transmitter of the present invention, error information can be confirmed by the internal communication parameters of the transmitter and the built-in indicator, but the output signal at the time of error is transmitted to the plant operation. It is possible to set a value that does not cause any trouble and that can be distinguished from a normal output. Therefore, when a minor failure occurs, the abnormality can be recognized from the value of the output signal or the trend without emergency stop of the plant. Further, since the type of error obtained by the self-diagnosis function on the transmitter side can be assigned to any error output, it is possible to determine an abnormal state from the output signal itself. By adding these functions to the transmitter, unintentional or inadvertent shutdown can be avoided, so that there is an effect that loss required for restarting on the user side can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a configuration of a differential pressure / pressure transmitter according to the present invention.

FIG. 2 is a display form showing arbitrary setting of the error output value and selection of a specified value.

FIG. 3 is a display form of the pattern output for each error type.

FIG. 4 is a display form of the same error type and error output allocation.

FIG. 5 is a diagram showing a display form of output swinging at the time of an error in a conventional technique.

FIG. 6 is a view showing a display form of an output swing at the time of an error in the related art.

FIG. 7 is a display form when an output at the time of an error is set to hold in the conventional technique.

[Explanation of symbols]

 110 Differential pressure / pressure detector 120 Electric signal converter 130 Signal output unit 140 Output signal display unit 150 Self-diagnosis unit

Claims (2)

[Claims] A differential pressure / pressure transmitter having an output setting function at the time of an error and / or a self-diagnosis function in addition to a function of converting a differential pressure and a pressure to be measured into an electric signal and transmitting the electric signal. A differential pressure / pressure transmitter characterized in that an error output value and / or an output pattern of the differential pressure / pressure transmitter can be arbitrarily set. 2. The differential pressure display according to claim 1, wherein the error output value and / or the display pattern of the output pattern are assigned different output displays depending on the type of the error.
Pressure transmitter.