DE8808651U1 - Calibratable pressure gauge with integrated measurement recording device - Google Patents

Description

CALIBRATION CAPABLE PRESSURE GAUGE WITH INTEGRATED MEASUREMENT RECORDING DEVICE

The invention relates to a calibratable pressure measuring device with integrated measured value recording device.

So far, there are single pressure gauges on the market that are used to measure both gas (air) pressure and liquid pressure. They are suitable for high and low pressure ranges. There are also gauges for temperature measurement. These well-known devices are equipped with analogue or digital display devices. In some cases they also have recording devices.

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The disadvantage of using the known Ge

advise that different individual devices are necessary for measuring and recording both high and low pressures, as well as for measuring temperature.

Another disadvantage of using such individual devices is that in order to obtain reproducible measured values, several or all of the necessary devices must be recalibrated.

It is almost impossible to take precise, simultaneous measurements with different individual devices. Monitoring certain values over a certain period of time, or monitoring the values in relation to each other, is only possible with the individual devices with great effort.

It is therefore the object of the present invention to create a calibratable pressure measuring device with which, in addition to the pressure reading, other important measured values can be recorded with one device, whereby both individual measurements and

& combined measurements of the values to be recorded are also possible

are available and the displayed and/or recorded values are easy to read and the

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The measuring device itself is simple in its construction and handling and that the device can be manufactured inexpensively.

This object is achieved according to the invention in that the integrated measurement value recording device is connected to at least one measurement value converter, the measurement value converter being connected to the measurement value recording device via a measurement value transmission line with a transmission and converter device arranged in a housing, and sensors being arranged as measurement value converters, and the transmission device being formed by amplifiers and a multiplexer, which are connected in series to an analog-digital converter, and the analog-digital converter having a direct connection to a microprocessor control, which in turn is connected to a printer or a digital display via a driver, with all connections, including the measurement value transmission line, being electronic connections.

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By using an integrated measuring device with, in particular, a microprocessor control, etc., this electronic transmission, registration and recording device opens up possibilities that are not possible with previous pressure measuring devices - and all this with a single device.

All measurement data is stored in the microprocessor. They can be called up from there at any time and as often as you like in all possible variations and printed out using the printer. The printout can be made either as a diagram or in plain text, with the diagram in landscape format and the plain text in portrait format. The stored values can also be called up using the digital display.

The data stored in the microprocessor is only deleted when the device is switched off.

Advantageously, at least one sensor for measuring the pressure in the high range of about 0-350 bar, preferably 300 bar and at least one

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Sensor should be arranged in the low range of about 0-2 bar, preferably 100 mbar . Furthermore, another sensor can also be arranged in the measuring device to measure the temperature .

Di.« Pressure measurements and temperature measurements are converted directly into electrical signals by the corresponding sensors and then forwarded, stored, processed, retrieved, printed and displayed, whereby the printout can optionally be made of individual measurements or individual values as well as of several summarized values.

According to the invention, three sensors are proposed, with which the pressure measurement of approx. 0-350 bar, the pressure measurement of approx. 0-2 bar and the temperature in the device in degrees C from minus 30 degrees to plus 60 degrees C can be measured.

The following variations or combinations are possible for the measurements:

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1.) Measurement of high pressure (approx. 0-350 bar) with or without temperature.

2.) Measurement of high pressure (approx. 0-350 bar) and low pressure (approx. 0-2 bar) with or without temperature.

3.) Measurement of low pressure (approx. 0-2 bar) with or without temperature.

&idiagr;· f.- I* 4.) Measurement of temperature only.

£ Thus, the proposed inventive

The device makes it possible to carry out both individual measurements and combined measurements depending on the task in order to obtain optimally meaningful values or comparative values.

The measurement of the temperature in the device essentially has a control function for the measurement results.

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In an embodiment of the invention, the measuring device can be

a motor vehicle power supply or via a battery installed in the device. The proposed device is independent of the general power supply and is ready for use at any time. With a fully charged battery, around 50-70 measurements can be carried out.

With an external power connection via the car socket (cigar lighter) with a permanently attached cable to 12 volts or 24 volts, this is possible without switching.

The battery can be charged using a 110/220 volt, 50/60 Hz charger that is built into the device or using the 24 volt vehicle power supply (truck).

It may be advantageous that, in an inventive design, connection sockets for external additional devices, in particular for additional digital or analog displays or operating and evaluation devices, can be arranged on the microprocessor control. In this case, both an input driver and an output driver are provided between the microprocessor control and the respective connection socket.

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In a further embodiment, the printer can be a matrix printer.

Matrix printers have proven to be particularly inexpensive and advantageous for this specific purpose. Matrix printers are small and take up little space. They produce easily legible prints.

It can be particularly advantageous that a self-test and zero adjustment of the device are automatically printed on each printed measuring strip.

The device automatically performs a self-test and zero adjustment for each measurement. The printout is made as a confirmation together with the individual serial number and the approval number of the device. In the event of any error, the error printout is made with the type of error.

At the touch of a button, the device also carries out an extended self-test and prints out the measured values. This makes it easy to check the function and accuracy of the device.

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It can be considered an inventive development that a compartment for storing cables, release button, power cable and
otherwise arranged.

All connecting cables are firmly connected to the device. No cable or sensor can get lost or
mixed up or connected incorrectly. All cables, plugs and accessories are stored neatly in the storage compartment and are within easy reach.

Advantageous further developments and inventive design result from the following based on the
Drawing shows a schematic representation of the embodiment.

Show it:

Figure 1 A block diagram in principle.

Figure 2 A perspective view of a

complete housing of the pressure measuring device according to the invention.

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A pressure gauge 1 consists of a housing 2, with the control buttons 3, the signal lights 4 and the digital display 5 arranged on the top of the housing. An opening 5 for driving the measuring strip is also provided on the housing 2.

Electronics 26 are arranged inside the housing. These consist of a sensor 8 for the pressure, a sensor 9 for the pressure and a sensor 10 for the temperature of the device. Each sensor is connected to an amplifier 11, whereby each amplifier 11 is electronically connected to a multiplexer 12. The sensors 8, 9, 10 are arranged as measured value converters and the amplifiers 11 and the multiplexer form the transmission device.

The sensors 8, 9, 10 and the amplifiers 11 and the multiplexer 12 are connected in series to the analog-digital converter 13. The analog-digital converter 13 has a direct connection to the micro-

'§ processor control 14. All connections 15 between the individual elements, including the measured value transmission lines between the sensors H ₁ ^

|; electronic connections. The connection

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between the sensor 10 and the amplifier 11 and the multiplexer 12 an electronic connection.

Furthermore, a battery 16 is provided in the housing 2. This battery 16 is supplied with a voltage of 24 volts via the power supply 17 either via the mains voltage 18 or an external power source 19. The energy supply for the multiplexer 12 comes either directly from the battery 16 or from the power supply 17 if the power source 19 is directly connected to the power supply 17. When the mains current 18 is connected to the power supply 17, only the battery 16 is charged, but not the pressure measuring device.

Connection sockets 20 for external additional devices can be arranged on the microprocessor control 14 via an input driver 22 and a fine output driver 21. In addition, a driver 23 with a matrix printer 24 and a digital display 5 is connected to the microprocessor control 14.

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The operating and display panel 25 and the digital display 5 are also directly electronically connected to the microprocessor control 14.

The device 2 has a storage compartment (not shown) for storing cables (not shown), a release button (not shown) and a power cable (not shown) and other accessories.

When using the device according to the invention, the accumulator 16 is first switched on and the external power source 19 for the voltage 12/24 volts is optionally plugged in. The sensors 8, 9, 10 are then connected to the object to be measured. Then set the control button to the control and display panel 25 and press the "Measurement preparation" button. The pressure measuring device now carries out a self-test fully automatically within a fraction of a second and automatically determines the sensor zero position. The individual serial number of the device is also printed out. The "Ready" control lamp then releases the device for measurement. The desired measurements can be carried out. After the measurement has been completed, the results are automatically printed out in the form of diagrams and

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additionally in plain text. There is space and instructions for hand-written entries on the diagram strip. It is printed on normal paper - absolutely scratch-proof.

The proposed invention creates a calibratable pressure measuring device that records additional measured values in addition to pressure measurement, whereby both individual measurements and combined measurements of the values to be recorded are possible and whereby the displayed and/or recorded values are easy to read and evaluate. The measuring device itself is simple in its construction and handling. The device can be manufactured inexpensively.

The microprocessor control also enables further evaluations:

(a) an average value;

(b) minimum-maximum monitoring;

c) value monitoring within specified tolerances, e.g. 5 bar + 10%.

Claims (1)

EXPECTATIONS 1.) Calibrable pressure gauge with integrated measurement value recording device, characterized in that the integrated measurement value recording device (5, 23, 24) is connected to at least one measurement value converter (8, 9, 10), the measurement value converter (8, 9, 10) being connected to the measurement value recording device (5, 23, 24) via a measurement value transmission line (15) with a transmission and converter device (11, 12, 13) arranged in a housing, and that sensors (Q, 9, 10) are arranged as measurement value converters, and the transmission device is formed by amplifiers (11) and a multiplexer (12) which are connected in series with an analog -2- # · · Il * Il » t Digital converter (13) are connected and that the analog-digital converter (13) has a direct connection to a microprocessor control (14), which in turn is connected via a driver (23) to a printer (24) or a digital display (5), whereby all connections (15) and the measured value transmission line are electronic connections. P 2.) Calibrable pressure gauge according to claim 1, characterized, j; that at least one sensor (8) for measuring ]\ of pressure in the high range of about 0-350 bar V; preferably 300 bar and at least one sensor Î (9) is arranged in the low range of about 0-2 bar, preferably 100 mbar. 3.) Calibrable pressure gauge according to claim 1 or 2, characterized in that a further sensor (10) for the temperature is arranged in the measuring device (1). -3- 4.) Calibrable pressure gauge according to one of claims 1 to 3, characterized in that the measuring device (1) can be operated via the motor vehicle power supply or a battery (16) arranged in the measuring device (1). 5.) Calibrable pressure gauge according to one of claims 1 to 4, characterized in that connection sockets (20) for external additional devices, in particular for further digital or analogue displays or operating or evaluation devices, are arranged on the microprocessor control (14). 6.) Calibrable pressure gauge according to one of claims 1 to 5, characterized in that the printer (24) is a matrix printer. -4- -4- 7.) Calibrable pressure measuring device according to one of claims 1 to 6, characterized in that a compartment for storing cables (15), release button and power cable and other items is arranged in the housing (2).