JPH01227021A - Method and apparatus for testing flowmeter and displacement meter - Google Patents

Abstract

PURPOSE:To make the detection of an index accurate by a method wherein a plurality of sensors are provided in the indication parts of a flowmeter and a displacement meter, the index of a pilot is detected, measurement of an error is executed simultaneously substantially by each sensor, and an average value is determined. CONSTITUTION:An upper cover being removed, a water supply meter 9 fitted with a rotary disk as a pilot indicator is fitted between joints 11 and 12, and a cap 22 is put on the head of the meter by operating a cylinder 24. When a control apparatus is operated thereafter, an operation proceeds automatically. A pilot having a plurality of indexes is provided in an indication part of the meter 9, while sensors 23a-23c which can detect the indexes of the pilot respectively in a corresponding manner are disposed therein, and counters 29 and 26a-26c count output pulses of a pulse oscillator 27 when water led in reaches an electrode 2a in a reference tank. The counters 26a-26c stop when counting up prescribed numbers. The counter 29 stops when the surface of water reaches an electrode 2b. An error of the meter 9 can be determined by averaging count values of the counters 26a-26c and comparing an averaged value with the value of the counter 29 with respect to a reference supply amount of water.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a test method for measuring the instrumental error of a flow meter and an integrating volume meter, and an apparatus for implementing this method.

[Conventional technology]

After a flow meter or an integrating volume meter is manufactured or repaired, it is necessary to perform adjustment so that the error in the indicated amount is always within a predetermined range.

For example, in the case of an integrating volume meter, measurement of instrumental error, which is a prerequisite for this adjustment work, usually involves passing fluid through the integrating volume meter to be tested, guiding the fluid to a reference tank, and accurately measuring the flow rate. This is done by measuring the amount of deviation in the amount indicated by the cumulative volume meter by this fluid passage.

That is, for example, the applicant of the present application first published Japanese Patent Application Laid-Open No. 56-10152.
The instrumental error measurement method disclosed in No. 1 is an integrating volume meter instrument error measuring method that measures the instrumental error of the integrating volume meter by passing a fluid through the integrating volume meter to be tested and guiding the fluid to a reference tank for measurement. , the number of pulses oscillated from the desired pulse oscillator is controlled in the reference tank during a period until the indicated amount of the integrating volume meter reaches a predetermined predetermined value ff1 (referred to as A), and approximately in synchronization with this. The fluid to be measured at is a predetermined standard ff1 (assumed to be B).
Count each in parallel during the period until reaching , and use the following calculation formula from each count (M and N): -kM 6= X100 (%) (However, k = The method used was to calculate the instrumental error e of the integrating volume meter using a calculation formula (a constant determined by B/A).

Here, the predetermined Ii of the indicated amount of the integrating volume meter is
In the case of a water meter, detection of A is achieved by attaching a rotating disc with radial stripes (indices) at regular intervals or a rotating body in the shape of an oblate truncated pyramid as the pilot pointer of the water meter. A pink-up consisting of a photoelectric element is placed above to pick up the rotational speed of the pilot pointer and take it out as a pulse signal, and when the count number of this pulse signal reaches a predetermined value, the predetermined ff1A is detected. .

Further, the predetermined reference amount B of the fluid measured in the reference tank can be detected by placing electrodes in the reference tank at predetermined intervals that emit a signal by touching the water surface rising inside the tank, for example. Detection is performed by disposing water of a predetermined group StB between the first electrode and the second electrode.

Therefore, the above predetermined instruction ff1A of the integrating volume meter
Conventionally, the pilot pointer was equipped with only one pick amplifier to detect the index when detecting the index. It was not possible to perform accurate detection, and the occurrence of considerable measurement errors was unavoidable.

Furthermore, even if the same number of detection pink amplifiers are provided corresponding to each index of the pilot pointer or the reflective surface that replaces it, water droplets etc. tend to adhere to the pilot pointer.
When water droplets adhere, they cause diffuse reflection, resulting in counting errors or overcounts, which poses a problem in that rotation cannot be detected reliably.

[Problem that the invention seeks to solve]

The present invention has been made in order to solve the above problems, and its purpose is to provide a flow rate that can accurately detect the rotation of the pilot and thereby perform instrumental error measurement with high precision. An object of the present invention is to provide a method and apparatus for testing a volume meter and an integrating volume meter.

[Means for solving problems]

The above purpose is to provide a pilot having a plurality of indicators in the indicating section of a flowmeter or an integrating volume meter, and to arrange sensors capable of detecting each indicator corresponding to each indicator of the pilot. This can be achieved by a flow meter and integrating volume meter testing method characterized by simultaneously measuring instrumental differences and finding the average value.

Further, in the above method, it is preferable that the output pulse of each sensor is corrected by the error correction steps described in the following items a) to C).

a) Outputting the threshold logic of the output pulse of each sensor (however, the threshold m is smaller than the number N of sensors) b) For each sensor, outputting the respective output pulse and the above-mentioned A step of calculating the logical product with the threshold logic output.

C) Generating a correction pulse and adding it to the output pulse train of the corresponding sensor when the logical product described in the previous section does not result in state 1 for each gate pulse.

Further, in the above method, a pilot having a plurality of indicators is provided in the indicating section of the flowmeter or an integrating volume meter, and a sensor capable of detecting the indicator is arranged corresponding to each indicator of the pilot, and each of the above-mentioned The present invention can be carried out using a flow meter and volume meter testing device characterized by being equipped with an arithmetic device that measures instrumental errors almost simultaneously using sensors and calculates the average value thereof.

Furthermore, it is desirable that the output circuit of each of the sensors be provided with an error correction circuit as described in items a) to C) below.

a) A threshold logic circuit that receives the output pulses of each sensor as input.

b) An AND circuit provided corresponding to each sensor and inputting the output of the corresponding sensor and the output of the threshold logic circuit described in the previous section.

C) A circuit that generates a supplementary pulse when a drop occurs in the output pulse train of the AND circuit and adds it to the output pulse train of the corresponding sensor.

In this specification, the term "indicator" refers to lines, dots, irregularities or striped patterns arranged radially on the pilot pointer, reflective surfaces arranged to form a polygonal pyramid surface, etc., which are capable of detecting the pilot pointer. This refers to all signs.

[For production]

With the flow meter and volume meter testing method and device as described above, it is possible to accurately detect pilot indicators using multiple sensors, and errors due to eccentricity, backlash, etc. are compensated for, resulting in high accuracy. It is possible to perform instrumental measurement.

(Example) Hereinafter, the configuration of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory view showing one embodiment of the integrating volume meter testing device according to the present invention, FIG. 2 is a partially cutaway perspective view for explaining the configuration of the S portion in FIG. Figure 3 is an explanatory diagram showing the arrangement of the pilot index and sensor, Figure 4 is a diagram to explain the measurement principle of the integrating volume meter test device shown in Figure 1, and Figure 5 is a diagram showing the arrangement of the pilot indicator and sensor. Figure 6 is a block diagram showing an embodiment of a circuit provided to compensate for malfunctions caused by missing output pulses or generation of extra pulses from the output pulse, and Figure 6 is a block diagram of the main parts of Figure 5 above. It is an explanatory diagram showing an output waveform.

In Fig. 1, 1 is the reference tank, 2a, 2b.

2c and 2d are water surface detection electrodes attached to the reference tank 1, 3 is a drain pipe, 4 is an overflow pipe, 5 is a water supply pipe, 6 is a water supply solenoid valve or electric valve, 7 is a water meter mounting base, and 8 is a spacer 9 is the water meter to be tested; 10.
11 and 12 are joints, 13 is a guide rail, 14 is a drive device for moving the joint 10, 14' is an operating lever thereof,
15 is a three-way solenoid valve (motorized valve) for air bleed, 16 is a drain pipe for air bleed, 17 is a large flow opening/closing solenoid valve (motorized valve), 18
19 is the small flow rate opening/closing solenoid valve (motorized valve), 20 is the flow rate setting valve, 21 is the drainage solenoid valve (
22 is a camp that is placed over the scale plate of the water meter 9 during the test; 23 is a sensor holder that incorporates a plurality of pickups 23a to 23c (see FIG. 2) such as photoelectric elements and is attached to the cap 22; 24 is a cylinder that moves the cap 22 up and down; 26a to 26c are counters that count the pulses obtained from the pickups 23a to 23c; 27 is a pulse oscillator; 30 is a calculation device that calculates the average value of the count values of the counters 28a to 28c; 31 is a calculation device that calculates the instrumental error of the integrated volume meter tested based on the average value and the count value of the counter 29; 32 is a printer.

The drain pipe 3 has a predetermined rise so that a certain amount of water always remains in the reference tank 1 and the pipe line even after draining. The water meter 9 to be tested is installed between the joints 11 and 12. In order to facilitate the installation work, the joint 11 is attached to the guide rail 13 by its legs 11'.
If the joint 10 attached to the shaft of the drive device 14 is pushed out to the left in the figure, the water meter 9 is crimped and set between the joints 11 and 12.

During the test, the top cover of the water meter is removed and the camp 22 is lowered directly onto the scale plate to cover it. In addition, when testing multiple meters at the same time, rail 1
3 is made longer, joints similar to the fibers 11 are arranged on the rail, and a meter to be tested is set in series between each joint. In that case, a cap 22,
A meter indication amount detector consisting of a sensor holder 23 and a cylinder 24 is provided.

The configuration of the meter indication amount detection section, particularly the section indicated by S in FIG. 1, will be explained based on FIG. 2.

In Fig. 2, numeral 9 is a water meter with the top cover removed, and on its scale plate 9a is a decimal pointer 9b that displays the flow rate.
9b is provided, and the guideline 9 is set according to the flow rate during water flow.
b, the pilot pointer 90, which rotates faster than 9b, is exposed. Therefore, when testing, the pilot pointer 90 is equipped with a disc 25 with clear radial indicators of brightness and darkness, and its rotational speed is measured by a sensor 23a such as a photoelectric element built into the sensor holder 23. 23c to extract it as a pulse signal. The water meter 9 is usually a wet type, and when water is passed, water will seep into the date plate. To prevent this from overflowing, a camp 22 is crimped to the meter case head 9d using a cylinder 24. and fit it in.

A glass plate 22a is fitted into the cap 22 together with rubber backings 22b, 22b. The sensor holder 23 is fixed on the glass plate 22a of the camp 22, and inside it there is a light source for illuminating the disc 25, and a light source for detecting the rotation speed of the pilot pointer by rotating the index on the disc. Sensors 23a to 23c made of photoelectric elements such as phototransistors, and electronic circuits for operating the sensors are incorporated.

As shown in FIG.
5c, and each sensor emits a pulse-like output signal each time an index passes the tip of the sensor.

The pulses obtained by the sensor 23a are sent to the counter 26a through the line 23a'' and counted.
The pulses obtained by sensor 3b are counted by counter 26b, and the pulses obtained by sensor 23c are counted by counter 26c.

At this time, each sensor 23a, 23b, 23c
are configured to correspond to indicators 25a, 25b, and 25c, respectively.

Therefore, for example, (1) the sensor 23a detects only the index 25a and is not sensitive to the other indexes 25b and 25c, and the sensors 23b and 23c similarly detect only the corresponding indexes 25b and 25C and do not detect the other indexes. If each sensor detects all indicators, install a 1/3 frequency divider on the output side of each sensor, and the sensor to which the output of each frequency divider corresponds will be set to the index 25a. ,
Either generate an output pulse when detecting 25b or 25c, or make sure that the first pulse emitted at the start of the test and the last pulse emitted at the end of the test are the same, even if the sensor does not receive any of the output pulses from each sensor. It is preferable that the indicator is generated by detecting an indicator.

Thus, the counters 26a to 26c start counting by a gate signal from the electrode 2a (or 2c) attached to the reference tank, and when the first pulse is counted, a signal is emitted, and the counters 28a to 28c respectively start counting.
, and the pulses from the pulse oscillator 27 are counted. Next, the rotating disk rotates a predetermined amount (
When the counters 26a to 26c each count a predetermined number of pulses, each counter 26a to 26c issues a signal again to stop the counters 28a to 28c from counting. Therefore, the counters 28a to 28c each count the number of pulses from the pulse oscillator 27, that is, the number of pulses from the rotating disk 25 only during the period until the indicated amount of the meter 9 reaches the predetermined value ff1A.
It counts the number of rotations.

Therefore, the indicators 25a to 25c on the disk 25 are provided at completely equal angular intervals, and the sensors 23a to 23c
If the discs are arranged at perfectly equal intervals, and there is no installation error or wobbling of the above-mentioned disks with respect to the pilot pointer of the water meter, then both sensors will detect the index at the same time, so each Counter 26a to 26
After the gating signal from electrode 2a (or 2c) of the reference tank is provided for c, both counters 26a to 26c simultaneously signal to counter 28, respectively.
Since the counters 28a to 28c are activated and the counting of a predetermined number of pulses by the counters 26a to 26c ends at the same time, the operations of the counters 28a to 28c are also stopped at the same time. However, since there is usually an installation error or wobbling of the disc 25 with respect to the pilot pointer of the water meter, the counters 28a to 28
The start and stop timings of the pulse generators c differ slightly, and therefore the number of pulses from the pulse oscillator 27 counted by the counters 28a to 28c also differs slightly.

Therefore, by calculating the average value of the count values of these counters 28a to 28c using the arithmetic unit 30, the above-mentioned error is canceled and the accurate number of revolutions of the disk 25 can be calculated.

Next, the arrangement of each electrode in the reference tank 1 will be explained using FIG. 1. The electrodes 2a and 2b are detectors for generating gate signals instructing the counter 29 to start and end counting when performing a large flow water flow test. A predetermined standard 1i (referred to as B) is placed between the tips of the electrodes 2a and 2b, that is, in the section shown in the figure.
The picture electrode is adjusted and arranged so that water is stored.

On the other hand, the electrodes 2C and 2d are used to conduct a water flow test with a small flow rate, and between the leading edges of the image, that is, the section L' in the figure, there is a predetermined amount that is smaller than the standard IB. A standard amount of water is stored.

The signals obtained from the electrodes 2a and 2c cause the counter 29 to start counting and are also directed to the counters 26a-26c to cause them to start counting the pulses from the sensors 23a-23c, respectively, as described above. Note that the electrodes for large flow rate and small flow rate tests do not necessarily need to be installed in parallel in one reference tank, but multiple reference tanks with different inner diameters can be provided depending on the flow rate.
It is also possible to arrange each electrode individually on them. In other words, when performing precise instrumental error tests over multiple stages,
Two to ten reference tanks with various inner diameters can be used to perform instrumental error tests on various meters with different capacities.
It is also recommended to have at least several books and use them sequentially.

The opening and closing of each electromagnetic valve or electric valve during the water flow test is automatically performed by a control device (not shown in the figure).

The operating sequence when performing instrumental error measurement of a water meter using the above device will now be described.

After removing the top cover and installing the water meter 9 with the rotary disk 25 attached as a pilot indicator between the joints 11 and 12, actuating the cylinder 24 and fitting the cap 22 into the meter head, the above control device is installed. Once activated, the following tasks will proceed automatically.

That is, first, the water supply solenoid valve 6 is opened and water is introduced into the meter 9. - At this time, the air bleed three-way solenoid valve is open to the air bleed drain pipe 16 side, and the air inside the meter and the joint is discharged from the drain pipe 16 along with water.

Next, by the action of a control timer set at the same time as the water supply solenoid valve 6 is opened, when a predetermined time required for air bleeding has elapsed, the three-way solenoid valve 15 is switched to the pipe side leading to the solenoid valves 17 and 19. It will be done. At this time, a new control timer is set, and after waiting for the pipe line internal pressure to become constant, of the solenoid valves 17 and 19 that were closed until then, the open/close solenoid valve 17 with a large flow rate is opened. Thus, water is introduced into the reference tank at a flow rate predetermined by the flow rate setting pulp 18, and the water level in the tank begins to rise. As soon as the water surface touches the tip of the electrode 2a, the second counter 29 starts counting pulses from the pulse oscillator 27, and the reference iB of water is stored in the tank, and the water surface touches the tip of the electrode 2a.
Stop the count when you touch b.

On the other hand, when the water surface touches the tip of the electrode 2a, the counters 26a to 26c start operating at the same time and start counting the output pulses of the sensors 23a to 23c, respectively, and at the same time emit a signal when the first pulse is counted. , respectively, cause the counters 28a to L28C to start counting the output pulses of the pulse oscillation B27, and when a predetermined number of pulses have been counted, a signal is issued again to stop the counting of the corresponding counters 28a to 28c, respectively. Therefore, the time when the counters 28a to 28c start counting is the time from when the counters 26a to 26c start operating until they count the first pulse, that is, until the sensors 23a to 23c first detect the index on the rotating disk 25. Normally, the count is delayed by an amount of time from the start time of the counter 29, although it is a very short time. Further, the counter 29 stops when the water surface touches the electrode 2b, whereas the counters 28a to 28c stop when the count number of the counters 26a to 26c reaches a certain number, and the latter time is Since each meter differs depending on the instrumental error, the counting end time of each counter is usually different. This relationship is as shown in FIG. 3. In FIG. 4, (a) shows the pulse oscillated from the pulse oscillator 27, and (b) shows the average count value (M) of the counters 28a to 28c. and count time, (c) is counter 2
The count time and count number (N) of 9 are shown.

In this way, the count time of each counter is generally the same but not completely the same, and the pulses oscillated from the pulse oscillator 27 are individually counted by each independent counter as described above. However, accurate instrumental error measurement is only possible by taking the average value.

Then, the count average (iM) of the counters 28a to 28c and the count value N of the counter 29 are calculated by the calculation device 3.
1 as input data, and calculate the instrumental error of Make 9 using a calculation formula described later. The thus obtained instrumental error value at a large flow rate is printed by a blink 32 directly connected to the arithmetic unit 31. At this time, the instrumental error display shows shi, -
It is convenient when adjusting the instrument error by adding a symbol and printing the error within the tolerance in black and the error outside the tolerance in red.

Then, at the same time that the water surface touches the electrode 2b and the counters 28a to 28c stop counting, the solenoid valve 17 is closed, and the solenoid valve 19 for small flow rate is opened this time.
Similarly, while the water surface rises in the L' section, pulse oscillation 2 is generated.
The number of pulses emitted from S27 is individually counted by counters 28a to 28c and 29, and the instrumental error at a small flow rate is calculated and recorded.

At the same time that the water surface touches the electrode 2d, the solenoid valve 19
is closed, the drain solenoid valve 21 is opened to drain the water in the tank, the water supply solenoid valve 6 is closed, and the three-way solenoid valve 15 is connected to the pipe line 16.
Switch to the side to drain the water in the water meter 9. With the above steps, the measurement of the instrumental error of the meter 9 is completed, but the time required for this is 1 if the diameter of the water meter is 13 mm.
It takes about 6 seconds, and about 10 seconds for a 25 mm one, so it can be done very efficiently in a very short time. All that is left to do is to raise and remove the camp 22, retreat the joints 10 and 11, and remove the water meter 9.

Here, a calculation formula for calculating the instrumental error of the integrating volume meter 9 from the count average value M of the counters 28a to 28c and the count (iN) of the counter 29 will be explained.

The instrumental error e of the integrating volume meter is usually -Q e = -X 100 (%) --------(1) (true fluid volume).

In the device of the present invention, the average count value M of the counters 28a to 28c during the period until the water meter 9 indicates the predetermined instruction ff1A(j2) is determined,
True water flow WkB C1,) predetermined by reference tank 1
If the counter 29 counts N pulses during the measurement period, the amount indicated by the water meter 9 during one pulse cycle is A/M, and the corresponding true water flow rate of the reference tank 1 is B/M. It is N. Therefore, instead of I and Q in equation (1), A/M and B/N can be used, respectively, to obtain (k is a constant determined by =B/A).

Therefore, the arithmetic circuit 31 calculates the instrumental error e based on the numerical values M and N using the calculation formula (2).

Of course, it is also possible to set k=1, that is, to make the predetermined IA of the integrated volume meter instruction amount that should be predetermined equal to the predetermined reference iB of the reference tank. In that case, the reference amount B may be set equal to a predetermined IA corresponding to a predetermined number of pulses generated in the pickups 23a to 23q by a predetermined number of rotations of the rotary disk 25. In the case of a water meter, this standard amount is 1 in a large flow test! It is appropriate to set it to about 0.2 to 0.5 in front and rear and small flow tests.

The frequency of the pulses generated by the pulse oscillator 27 is set such that at least 1000 pulses are generated during the period in which the reference tank is filled with the reference amount B of fluid. Since the number of pulses affects measurement accuracy, it is recommended that the frequency be set as high as possible within the range allowed by the resolution of the reference tank and counter. Conventional equipment directly uses the number of pulses generated by the striped pattern on a rotating disk attached to the pilot pointer as numerical data for instrumental error measurement, but there is a physical limit to subdividing the striped pattern. In contrast, in the present invention,
Since the method of the present invention uses a pulse oscillator that is not directly related to the meter, the measurement accuracy can be significantly improved.

Note that the pulse oscillator 27 shown in FIG. 1 is provided independently from the fluid pipe line and always oscillates pulses at a constant frequency regardless of the flow rate of the fluid, but as a pulse oscillator, Alternatively, it is also recommended to use a flow rate transmitter that is provided in the fluid conduit (for example at the position of the spacer 8) and emits a pulse signal depending on the flow rate. This is because, as shown in Fig. 4, the operating times of the first counter and the second counter are slightly different, and the flow rate in the pipe changes slightly during this different time. ,
This is because by changing the number of pulses emitted from the pulse oscillator in accordance with changes in the flow rate, the count number of the counter more reliably reflects the instrumental error of the meter.

Next, FIGS. 5 and 6 will be explained.

In the circuit shown in Figure 5, if water etc. adheres to the pilot indicator,
This is provided to compensate for malfunctions caused by missing output pulses or extra pulses from the sensor.

In FIG. 5, 33-1 to 33-8 are sensors, 34-1 to 34-8 are waveform shaping circuits, 35 is a logic threshold circuit, 37 is a monostable element, 38 is a knot circuit, 39 is a delay circuit, 40 -1 to 40-8 are AND circuits, 41-1 to 41-8 are RS bistable elements, and 42-1 to 42-8 are counters.

Therefore, the output pulses of each sensor 33-1 to 33-8 are normally transmitted almost simultaneously, but as shown in FIG. 6, there may be some time difference between them, and in some cases As shown by the dotted line in the figure, a case where the output pulse P is missing or a ghost pulse P2 occurs. The circuit described herein compensates for missing pulses P1 and eliminates ghost pulses P2.

The output pulses of the respective sensors 33-1 to 33-8 are input to waveform shaping circuits 34-1 to 34-8 connected to the rear stage of the respective sensors 33-1 to 33-8, and after being waveform-shaped, the output pulses are sent to the logic circuits 34-1 to 34-8. Threshold circuit 35 and AND circuit 4
It is input to 0-1 to 40-8.

The threshold value m of the logic threshold circuit 35 is:
It is set smaller than the number N of sensors, and when m sensors respectively detect the corresponding index, the threshold logic output becomes state l, and the monostable element 37
is triggered to generate a gate pulse with a pulse width T.

Therefore, this pulse width T is set to be longer than the maximum delay time of the output pulses of each sensor, which should originally be generated at the same time.

The gate pulse generated by the monostable element 37 and the output pulse of each waveform shaping circuit 34-1 to 34-8 are input to AND circuits 40-1 to 40-8, respectively. 40-8
outputs the AND of the gate pulse and each sensor output pulse. The outputs of AND circuits 40-1 to 40-8 are in state 1
, their outputs are the corresponding R
S high stable elements 41-1 to 41-8 are set, and conversely, their AND is set to state 1 for each gate pulse.
If not, or if a drop occurs in the output pulse train of the AND circuits 40-1 to 40-8, the output of the NOT circuit 38 becomes the set of the RS bistable elements 41-1 to 41-8. Set something that is not in the state.

That is, the output of the NOT circuit 38 becomes a supplementary pulse when a pulse from any sensor is missing.

Therefore, RS pie staple elements 41-1 to 4
Each time 1-8 is set, each of the counters 42-1 to 42-8 connected to the subsequent stage counts its cent output.

The output of the knot circuit 38 is delayed by a predetermined time by the delay circuit 39 and input to the R terminals of the RS bistable elements 41-1 to 41-8, so that the RS bistable elements 41-1 to 41-8 are will be reset all at once.

Furthermore, even if any of the sensors generates ghost pulses or noise, the output of the logic threshold circuit 35 is kept at state 0, so those pulses do not pass through the AND circuits 40-1 to 40-8. Therefore, test data will not be affected.

In addition, in the embodiment on the ridge, the monostable element 37 is used in order to replenish the output pulse train of the sensor as soon as possible when the output pulse train is missing, so that the output pulse of each sensor is sufficient. When it is short and not necessary, the monostable element 37 cannot be omitted.

Therefore, if the same number of detection pickups are provided for each reflective surface of the pilot pointer, water droplets, etc. will adhere to the reflective surface of the pilot pointer, causing diffuse reflection due to the water droplets, resulting in missing pulses and noise. Even if this occurs, the rotation of the pilot pointer can be reliably detected.
It is possible to perform highly accurate instrumental error measurements.

In addition, in the explanation on the ridge, a water meter has been described as an example of the integrating volume meter to be tested, but the present invention is not limited to water meters, but can be applied to instrumental error measurement of various integrating volume meters and flowmeters. be able to. In that case, the detector for detecting the predetermined indicated amount of the integrating volume meter or flow meter (in the above embodiment, the detector consisting of the components indicated by reference numerals 22 to 30) is a detector suitable for the integrating volume meter, etc. The logic circuit can be replaced with one equivalent to the ridge, and the configuration of the fluid pipeline should be selected and determined as appropriate depending on the type of integrating volume meter, etc. to be tested. The present invention encompasses all of them.

〔Effect of the invention〕

Since the present invention is constructed as described above, the present invention provides an excellent flow meter and integrated volume meter instrument difference measuring method that can accurately measure the instrumental difference even if there is an installation error or wobbling in the pilot. A device is provided.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing one embodiment of the integrating volume meter testing device according to the present invention, FIG. 2 is a partially cutaway perspective view for explaining the configuration of the S portion in FIG. Figure 3 is an explanatory diagram showing the arrangement of the pilot index and sensor, Figure 4 is a diagram to explain the measurement principle of the integrating volume meter test device shown in Figure 1, and Figure 5 is a diagram showing the arrangement of the pilot indicator and sensor. Figure 6 is a block diagram showing an embodiment of a circuit provided to compensate for malfunctions caused by missing output pulses or generation of extra pulses from the output pulse, and Figure 6 is a block diagram of the main parts of Figure 5 above. It is an explanatory diagram showing an output waveform.

Claims (1)

[Claims] 1) A pilot having a plurality of indicators is provided in the indicating section of the flow meter or integrating volume meter, and a sensor capable of detecting each indicator is arranged corresponding to each indicator of the pilot, and each A test method for a flow meter and an integrating volume meter, characterized in that instrumental errors are measured almost simultaneously using a sensor and the average value thereof is determined. 2) A pilot having a plurality of indicators is provided in the indicating section of the flowmeter or integrating volume meter, and a sensor capable of detecting each indicator is arranged corresponding to each indicator of the pilot, and each of the sensors is used to detect the indicator almost simultaneously. 1. A test device for a flow meter and an integrated volume meter, characterized in that it is equipped with an arithmetic device for measuring a difference and finding an average value thereof. 3) The method for testing a flow meter and an integrating volume meter according to claim 1, wherein the output pulse of each sensor is corrected by the error correction step described in the following items a) to c). a) Outputting the threshold logic of the output pulse of each sensor (however, the threshold m is smaller than the number N of sensors) b) For each sensor, outputting the respective output pulse and the above-mentioned A step of calculating the logical product with the threshold logical output. c) Generating a correction pulse and adding it to the output pulse train of the corresponding sensor when the logical product described in the previous section does not result in state 1 for each gate pulse. 4) The flow meter and volume meter testing device according to claim 2, wherein the output circuit of each of the sensors includes an error correction circuit described in the following items a) to c). a) A threshold logic circuit that receives the output pulses of each sensor as input. b) An AND circuit provided corresponding to each sensor and inputting the output of the corresponding sensor and the output of the threshold logic circuit described in the previous section. c) A circuit that generates a supplementary pulse when a drop occurs in the output pulse train of the AND circuit and adds it to the output pulse train of the corresponding sensor.