JPH07243898A - Gas meter calibrator - Google Patents
Gas meter calibratorInfo
- Publication number
- JPH07243898A JPH07243898A JP4268128A JP26812892A JPH07243898A JP H07243898 A JPH07243898 A JP H07243898A JP 4268128 A JP4268128 A JP 4268128A JP 26812892 A JP26812892 A JP 26812892A JP H07243898 A JPH07243898 A JP H07243898A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- gas meter
- line
- test
- meter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【０００１】[0001]
【技術分野】本発明は、ガスメータを試験するガスメー
タ校正装置に関し、より詳細には、ガスメータの流量試
験を音速ノズルを基準として行うガスメータ校正装置に
関する。TECHNICAL FIELD The present invention relates to a gas meter calibration device for testing a gas meter, and more particularly to a gas meter calibration device for performing a gas meter flow rate test with a sonic nozzle as a reference.
【０００２】[0002]
【従来技術】家庭などで使用される膜式のガスメータ
は、工場を出荷するとき流量の標準器により校正試験が
行われ、校正試験に合格したガスメータが出荷される。
流量の標準器は、計量研究所の１次国家流量標準定積槽
などの特定標準器で校正された音速ノズル（Ｓ・Ｖノズ
ル;Sonic Venturi Nozzle）、湿式流量計が用いられ
る。しかし、湿式流量計は可動部を有し大形で取扱いに
くいなどの問題があるため音速ノズルを流量の標準とす
る方向に向っている。なお、ガスメータの校正試験にお
いては、前記流量の標準器による流量計器差試験の他
に、最大流量におけるガスメータの流入口、流出口間の
差圧試験や洩れ試験が行われる。洩れ試験は基準圧力
（例えば；１０ｋｐａ（キロハ゜スカル））の圧縮空気を所走
時間（例えば；３分間）印加したときの基準圧力からの
圧力変化をみるものである。以下に音速ノズルを用いた
従来のガスメータ校正装置を述ベる。2. Description of the Related Art A membrane gas meter used at home or the like is subjected to a calibration test by a flow rate standard when shipped from a factory, and a gas meter that has passed the calibration test is shipped.
As the flow rate standard device, a sonic nozzle (SV nozzle; Sonic Venturi Nozzle) calibrated with a specific standard device such as the primary national flow rate standard constant volume tank of the Metrology Institute, or a wet flow meter is used. However, the wet flowmeter has a problem that it has a moving part and is large in size and difficult to handle, so that the sonic nozzle is used as a standard flow rate. In addition, in the calibration test of the gas meter, in addition to the flow meter difference test by the standard device of the flow rate, a differential pressure test and a leak test between the inlet and the outlet of the gas meter at the maximum flow rate are performed. The leak test is to observe a pressure change from the reference pressure when compressed air having a reference pressure (eg, 10 kpa (kilopascal)) is applied for a running time (eg, 3 minutes). A conventional gas meter calibration device using a sonic nozzle will be described below.
【０００３】図２は従来のガスメータ校正装置を説明す
るためのブロック図で、図中、３１は加圧空気ライン、
３２は加圧空気源、３３は精密減圧弁（たとえば設定圧
力を１０ｋｐａとする）、３４は開閉弁、３５は大気吸
込口、３６は大気ライン、３７はフィルタ、３８はミス
トセパレータ、３９はガスメータライン、４０はガスメ
ータ、４１はＳＶメータユニット、４２は流入口、４３
は流出口、４４は開閉弁、４５はストレーナ、４６は真
空ポンプ、４７は圧力伝送器、４８は差圧伝送器、４９
は圧力伝送器、５０，５１，５２，５３は導管、５４は
基準圧力計、Ｖ１，Ｖ２，Ｖ３，Ｖ４，Ｖ５は電磁弁で
ある。FIG. 2 is a block diagram for explaining a conventional gas meter calibration device. In the figure, 31 is a pressurized air line,
Reference numeral 32 is a pressurized air source, 33 is a precision pressure reducing valve (for example, the set pressure is 10 kpa), 34 is an opening / closing valve, 35 is an air inlet, 36 is an atmosphere line, 37 is a filter, 38 is a mist separator, 39 is a gas meter. Line, 40 is gas meter, 41 is SV meter unit, 42 is inlet, 43
Is an outlet, 44 is an on-off valve, 45 is a strainer, 46 is a vacuum pump, 47 is a pressure transmitter, 48 is a differential pressure transmitter, 49
Is a pressure transmitter, 50, 51, 52 and 53 are conduits, 54 is a reference pressure gauge, and V1, V2, V3, V4 and V5 are solenoid valves.
【０００４】加圧空気ライン３１は、ガスメータ４０の
洩れ試験を行うための圧縮空気ラインで、加圧空気源３
２から導入される圧縮空気を精密減圧弁３３により１０
ｋｐａの基準圧力に調整する。また、大気ライン３６は
流量試験のためにガスメータ４０に空気を導入する導管
で、空気は大吸込口３５より吸込まれる。加圧空気ライ
ン３１と大気ライン３６とは開閉弁３４_1，３４_2とを
交互に切替えられる。切替えられた加圧空気ライン３１
と大気ライン３６とは、ガスメータライン３９に接続さ
れる。The pressurized air line 31 is a compressed air line for conducting a leak test of the gas meter 40, and the pressurized air source 3
The compressed air introduced from 2 is supplied by the precision pressure reducing valve 33 to 10
Adjust to a standard pressure of kpa. Further, the air line 36 is a conduit for introducing air into the gas meter 40 for the flow rate test, and the air is sucked through the large suction port 35. The pressurized air line 31 and air line 36 off valve 34_ 1 is switched alternately and 34_ 2. Switched pressurized air line 31
And the atmosphere line 36 are connected to the gas meter line 39.
【０００５】ガスメータライン３９には試験されるガス
メータ４０_1，…４０_ｎと、ＳＶメータユニット４１
と、真空ポンプ４６とが直列に接続されている。なおガ
スメータライン３９のガスメータ４０_1の流入口の上流
側４０ａと流出口の下流側４０ｂとには開閉弁３４が取
り付けられ、以下同様に各々のガスメータの流入口の上
流側、流出口の下流側に開閉弁３４が取り付けられてい
る。また、ガスメータ４０_1の流入口と開閉弁３４_3と
の間には高圧側の導管５０が分岐され、分岐された導管
５０は電磁弁Ｖ１を介してゲージ圧力を指示する圧力伝
送器４７と、電磁弁Ｖ３，導管５２を介して差圧伝送器
４８の高圧側に接続されている。以下、すべてのガスメ
ータ４０に関して上述のガスメータ４０_1と同様に圧力
伝送器４７と差圧伝送器４８に接続されている。また、
差圧伝送器４８の低圧側導圧口は、低圧側の導管５３と
電磁弁Ｖ２を介して接続される。[0005] gas meter 40_ 1 to be tested to the gas meter line 39, ... and 40_n, SV meter unit 41
And a vacuum pump 46 are connected in series. Note that the downstream side 40b of the upstream side 40a and the outlet of the inlet gas meter 40_ 1 gas meter line 39 opening and closing valve 34 is mounted, and so each of the gas meter inlet upstream of, downstream of the outlet An on-off valve 34 is attached to the. Between the gas meter 40_ 1 inlet and closing valve 34_ third conduit 50 of the high pressure side is branched, branched conduit 50 to the pressure transmitter 47 to instruct the gauge pressure via the solenoid valve V1, It is connected to the high pressure side of the differential pressure transmitter 48 via a solenoid valve V3 and a conduit 52. Hereinafter, with respect to all of the gas meter 40 in the same manner as the gas meter 40_ 1 described above is connected to a pressure transmitter 47 and differential pressure transmitter 48. Also,
The low pressure side pressure introducing port of the differential pressure transmitter 48 is connected to the low pressure side conduit 53 via the solenoid valve V2.
【０００６】ＳＶメータユニット４１は複数の同一又は
異な秤準流量の音速ノズル４１ａを切替可能に流入口４
２と流出口４３とで区画された隔板４１ｂに取り付けら
けれ封止板（図示せず）により封止される。音速ノズル
４１ａの上流側圧力は電磁弁Ｖ４を介して圧力伝送器４
９で測定される。また温度も温度計（図示せず）により
測定される。また、湿度は、湿度計（図示せず）によっ
て測定される。The SV meter unit 41 is capable of switching a plurality of sonic nozzles 41a having the same or different standardized flow rates, and is provided with an inflow port 4
It is attached to a partition plate 41b divided by 2 and the outlet 43, and is sealed by a sealing plate (not shown). The upstream pressure of the sonic nozzle 41a is applied to the pressure transmitter 4 via the solenoid valve V4.
Measured at 9. The temperature is also measured by a thermometer (not shown). The humidity is measured by a hygrometer (not shown).
【０００７】上述の、従来のガスメータ校正装置では、
洩れ試験においては、下流側開閉弁３４_ｎのみ封止
し、他の開閉弁を開けて１０ｋｐａに調整された圧縮空
気を印加してからガスメータ４０_1に関しては開閉弁３
４_3と３４_4とを閉止し、電磁弁Ｖ１を開けて３分間保
持し、大圧力を基準とした圧力伝送器４７の指示変化に
より洩れの有無を検査する。また、最大流量を流したと
きの各々のガスメータ４０の差圧は、電磁弁Ｖ１，Ｖ
２，Ｖ３を開放して差圧伝送器４８で測定される。さら
にまた、流量試験においては、開閉弁３４_1を閉じ、３
４_2を開けて空気吸込口をガスメータライン３９と接続
するとともにガスメータライン３９のすべての開閉弁を
開けてＳＶメータユニット４１の選択された、基準流量
が流れる音速ノズル４１ａを介して空気吸込口３５から
導入された空気を真空ポンプで吸引する。各ガスメータ
の流量の圧力補正は、大気圧から、これらの差圧を減じ
た圧力で補正する。In the above-mentioned conventional gas meter calibration device,
In leakage test seals only downstream side switching valve 34_N, on-off valve 3 for the gas meter 40_ 1 from application of compressed air which is adjusted to 10kpa to open the other opening and closing valves
Closed and 4_ 3 and 34_ 4, and holds open the solenoid valve V1 3 minutes and examined for leakage according to an instruction change of pressure transmitter 47 relative to the large pressure. Further, the differential pressure of each gas meter 40 when the maximum flow rate is flown is determined by the solenoid valves V1, V
2, V3 is opened, and the differential pressure transmitter 48 measures. Furthermore, in the flow test, closes the on-off valve 34_ 1, 3
4_ 2 by opening the air inlet is selected for SV meter unit 41 is opened all of the on-off valve of the gas meter line 39 as well as connected to the gas meter line 39, air inlet 35 through the sonic nozzle 41a the reference flow rate flows The air introduced from is sucked with a vacuum pump. The pressure of the flow rate of each gas meter is corrected by the pressure obtained by subtracting these pressure differences from the atmospheric pressure.
【０００８】しかし、上述のガスメータ試験において
は、洩れ試験は、大気圧を基準として行われるが、洩れ
試験では１台当り３分の時間を要するので、すべてのガ
スメータの試験が完了するまでは多くの時間を費やす。
差圧試験も同様に各ガスメータの必要な差圧データを読
み取るのに多くの時間がかかる。この間、試験室の気
温、湿度や気圧が変化するので基準圧力が変化すること
による測定誤差が生じ、測定値の信頼度が低下した。However, in the above-mentioned gas meter test, the leak test is carried out based on the atmospheric pressure, but since the leak test requires 3 minutes per unit, many leak tests are required until all gas meter tests are completed. Spend time.
Similarly, in the differential pressure test, it takes a lot of time to read necessary differential pressure data of each gas meter. During this time, since the temperature, humidity and atmospheric pressure of the test room changed, a measurement error occurred due to the change of the reference pressure, and the reliability of the measured value decreased.
【０００９】[0009]
【目的】本発明は、上述のごとき実情に鑑みてなされた
もので、ガスメータの試験中に、基準とする圧力源、た
とえば大気圧の変化などの影響をなくすとともに基準圧
力の絶対圧力を精密に測定し、この基準圧力を基準とし
て測定することによりガスメータ、ＳＶメータユニット
各部の差圧を安定した精度の高い差圧試験を行い、信頼
性の高いガスメータ校正装置を提供することを目的とす
るものである。[Purpose] The present invention has been made in view of the above-mentioned circumstances, and eliminates the influence of a reference pressure source, for example, a change in atmospheric pressure, and accurately determines the absolute pressure of the reference pressure during a gas meter test. An object of the present invention is to provide a highly reliable gas meter calibration device by performing a stable and highly accurate differential pressure test by measuring the differential pressure between each part of the gas meter and the SV meter unit by measuring with this reference pressure as a reference. Is.
【００１０】[0010]
【構成】本発明は、上記目的を達成するために、ガスメ
ータの洩れ試験を行うために該ガスメータに一定圧の空
気を印加する高圧基準圧力源と、流量試験及び差圧試験
を行うために大気を吸込む空気吸込部と、流入流出口を
開閉可能な弁を有するガスメータを複数直列に接続した
ガスメータラインと、複数の音速ノズルを切替可能に配
設したＳＶメータユニットと、真空ポンプとを順次直列
接続したガスメータ試験ラインと；切替可能に大気と連
通し大気圧を保持する基準圧力ラインと；前記複数のガ
スメータの流入口と流出口とを各々切替可能に前記基準
圧力ラインに接続する複数の導管と；前記基準圧力ライ
ン及びＳＶメータユニットの上流側の圧力を測定する絶
対圧力計と；前記各々のガスメータの流入口と流出口と
前記基準圧力ライン間の圧力を各々測定する差圧計とか
らなり、ガスメータの圧力補正、洩れ及び差圧を前記基
準圧力ラインの絶対圧力を基準として前記差圧計の読み
から検知することを特徴とするものである。以下、本発
明の実施例に基いて説明する。To achieve the above object, the present invention provides a high-pressure reference pressure source for applying a constant pressure of air to a gas meter for performing a leak test of the gas meter, and an atmosphere for performing a flow rate test and a differential pressure test. A gas suction line for sucking air, a gas meter line in which a plurality of gas meters each having a valve capable of opening and closing an inflow / outflow port are connected in series, an SV meter unit in which a plurality of sonic nozzles are switchable, and a vacuum pump are sequentially connected in series. A connected gas meter test line; a reference pressure line that is switchably connected to the atmosphere to maintain atmospheric pressure; a plurality of conduits that are switchably connected to the reference pressure line and inlets and outlets of the plurality of gas meters An absolute pressure gauge for measuring the pressure on the upstream side of the reference pressure line and the SV meter unit; and an inlet and an outlet of each of the gas meters and the reference pressure line. It consists of a differential pressure gauge, each measuring the pressure between the pressure compensation of the gas meter, and is characterized in that to detect the leakage and differential pressure readings from the differential pressure gauge based on the absolute pressure of the reference pressure line. Hereinafter, it demonstrates based on the Example of this invention.
【００１１】図１は、本発明におけるガスメータ校正装
置を説明するためのブロック図で、図中、１は加圧空気
ライン、２は加圧空気源、３はフイルタ、４はミストセ
パレータ、５は精密減圧弁、６は開閉弁、７はサイレン
サ、８は大気ライン、９はガスメータライン、１０はガ
スメータ、１１はＳＶメータユニット、１２は音速ノズ
ル、１３は整流管、１４は流入口、１５は流出口、１７
は弁、１８はストレーナ、１９は真空ポンプ、２０は大
気基準圧力ライン、２１，２２，２７は導管、２３，２
４は差圧発信器、２５は大気開放管、２６は絶対圧力計
である。FIG. 1 is a block diagram for explaining a gas meter calibration device according to the present invention. In the figure, 1 is a pressurized air line, 2 is a pressurized air source, 3 is a filter, 4 is a mist separator, and 5 is a mist separator. Precision pressure reducing valve, 6 is an on-off valve, 7 is a silencer, 8 is an atmospheric line, 9 is a gas meter line, 10 is a gas meter, 11 is an SV meter unit, 12 is a sonic nozzle, 13 is a rectifying pipe, 14 is an inlet, 15 is Outlet, 17
Is a valve, 18 is a strainer, 19 is a vacuum pump, 20 is an atmospheric reference pressure line, 21, 22 and 27 are conduits, and 23, 2
4 is a differential pressure transmitter, 25 is an atmosphere open pipe, and 26 is an absolute pressure gauge.
【００１２】洩れ試験用の加圧基準圧力は、加圧空気源
１からフィルタ３、ミストセパレータ４を介して除塵除
湿され精密減圧弁５により基準圧力１０ｋｐａに調整さ
れる。流量試験及び差圧試験用の大気はサイレンサ７に
より空気吸込みのときに発生する音を消去し大気ライン
８に導入される。加圧基準圧力の空気と、吸込み大気の
何れか開閉弁６_1と６_2とを互いに切替えることにより
ガスメータライン９に導入される。The pressurized reference pressure for the leak test is dehumidified and dehumidified from the pressurized air source 1 through the filter 3 and the mist separator 4 and adjusted to a reference pressure of 10 kpa by the precision pressure reducing valve 5. The atmosphere for the flow rate test and the differential pressure test is introduced into the atmosphere line 8 after the sound generated when the air is sucked is eliminated by the silencer 7. And pressurizing the pressure reference pressure air is introduced into the gas meter line 9 by switching the suction or off valve 6_ 1 and 6_ 2 atmosphere together.
【００１３】ガスメータライン９には試験されるガスメ
ータ１０_1…１０_nと音速ノズル１２を配設した大気ラ
イン８から導入された空気を真空ポンプ１９で吸引し所
定の基準の空気流量をガスメータ１０_1…１０_nに流
す。ＳＶメータユニット１１は、研量研究所の１次国家
流量標準定積槽で校正された複数の音速ノズル１２を、
流入口１４と流出口１５とを区画する隔壁１１ａに取り
付けられている。音速ノズル１２は、同一基準流量又は
基準流量の異なる規格のものが取り付けられ、空気の基
準流量をより安定に流すため、各々の上流側に整流格子
を挿入した整流管１３を取り付け蓋１１ｂでＳＶメータ
ユニット１１を閉止している。音速ノズル１２は、流出
口１５側のＳＶメータユニット内で音速ノズル１２の流
出口を封止することにより、使用音速ノズル１２を選択
する。[0013] The gas meter 10_ 1 ... 10_ n and introduced air from the atmosphere line 8 which is disposed a sonic nozzle 12 by suction with a vacuum pump 19 meter the air flow rate of a predetermined reference 10_ 1 to be tested to the gas meter line 9 ... flow to 10_ n. The SV meter unit 11 includes a plurality of sonic nozzles 12 calibrated in the primary national flow rate standard constant volume tank of the Research Institute.
It is attached to a partition wall 11 a that divides the inflow port 14 and the outflow port 15. The sonic nozzles 12 are attached with the same reference flow rate or with different standard flow rates, and in order to flow the reference flow rate of air more stably, the rectifying tubes 13 each having a rectifying grid inserted on the upstream side are attached to the SV with the lid 11b. The meter unit 11 is closed. The sonic nozzle 12 selects the sonic nozzle 12 to be used by sealing the outlet of the sonic nozzle 12 in the SV meter unit on the outlet 15 side.
【００１４】音速ノズル１２の基準流量は、上流側圧
力，温度及び湿度などによって変るので、この圧力，温
度及び湿度を測定し、測定値に基づいて基準流量の補正
が行われる。図１においては、煩雑をさけるため、圧力
の測定のみを示している。音速ノズル１２の圧力は、電
磁弁Ｖ2，Ｖ6を開けて、導管２７の圧力として絶対圧力
計２６により測定される。Since the reference flow rate of the sonic nozzle 12 changes depending on the upstream pressure, temperature and humidity, the pressure, temperature and humidity are measured, and the reference flow rate is corrected based on the measured values. In FIG. 1, only pressure measurement is shown to avoid complication. The pressure in the sonic nozzle 12 is measured by the absolute pressure gauge 26 as the pressure in the conduit 27 by opening the solenoid valves V 2 and V 6 .
【００１５】各々のガスメータ１０の、例えばガスメー
タ１０_1においては、流入口１０ａと流出口１０ｂとに
おいて各々導管２１と２２とが接続され、電磁弁Ｖ1，
Ｖ2，Ｖ3，Ｖ4を介して大気基準圧力ライン２０に接続
されている。導管２１は大気基準圧力ライン２０と接続
する以前に導管２１ａと２１ｂとに分岐され接続され
る。導管２１ａには電磁弁Ｖ１とＶ２が、導管２１ｂに
は電磁弁Ｖ３とＶ４が直列に接続され、電磁弁Ｖ１とＶ
２との間は、差圧発信器２３の高圧側入力２３−１に接
続される。一方、導管２１ｂには電磁弁Ｖ３とＶ４とが
直列接続され、電磁弁Ｖ３とＶ４との間は差圧発信器２
３の低圧側入力２３−２に接続される。ガスメータ１０
_1の流出口側でも導管２１と同様に分岐されて大気基準
圧力ライン２０に接続される。各々のガスメータ１０-
ｉ（ｉ＝２〜１０）もガスメータ１０_1と同様に、大気
基準圧力ライン２０に接続される。なお、大気基準圧力
ライン２０は絶対圧力計２６により精密に測定される。[0015] Each of the gas meter 10, in the example gas meter 10_ 1, and each conduit 21 and 22 are connected in the inlet 10a and outlet 10b, the solenoid valve V 1,
It is connected to the atmospheric reference pressure line 20 via V 2 , V 3 and V 4 . The conduit 21 is branched and connected to the conduits 21a and 21b before being connected to the atmospheric reference pressure line 20. Solenoid valves V1 and V2 are connected in series to the conduit 21a, and solenoid valves V3 and V4 are connected in series to the conduit 21b.
2 is connected to the high voltage side input 23-1 of the differential pressure transmitter 23. On the other hand, solenoid valves V3 and V4 are connected in series to the conduit 21b, and the differential pressure transmitter 2 is provided between the solenoid valves V3 and V4.
3 is connected to the low voltage side input 23-2. Gas meter 10
The outlet side of _ 1 is branched similarly to the conduit 21 and is connected to the atmospheric reference pressure line 20. Each gas meter 10-
i (i = 2~10) also in the same manner as the gas meter 10_ 1, is connected to the atmosphere reference pressure line 20. The atmospheric reference pressure line 20 is precisely measured by the absolute pressure gauge 26.
【００１６】以下、図１に示した発明のガスメータ校正
装置の動作を説明する。 （１）洩れ試験；開閉弁６_2と６nとを閉じ、その他の
開閉弁６を開けることによりガスメータライン９には加
圧空気源２から導入され、精密減圧弁５により１０ｋｐ
ａに調整された加圧基準圧力を導入する。ガスメータ１
０_1の洩れ試験は、流入、流出側の開閉弁６−３と６−
４とを閉じガスメータ１０_1内に加圧基準圧力の空気を
封止し、所定時間、例えば３分間の間の洩れ量による圧
力降下が、例えば、２００ｐａ（パスカル）以下であれ
ば合格となる。この圧力降下は、電磁弁Ｖ１とＶ４とを
閉じ、Ｖ２とＶ３を開けることにより、ガスメータ１０
_1の流入口１０ａと大気基準圧力ライン２０との間の差
圧が差圧発信器２３により測定される。大気基準圧力ラ
イン２０には電磁弁５を開けることにより外気導入管２
５から大気圧が導入され導入後、電磁弁Ｖ５を閉じて一
定の大気基準圧力を保っている。しかし室温の変化によ
り圧力変動が生ずるので絶対圧力計２６で測定してい
る。以下、他のガスメータ１０-iもガスメータ１０_1と
同様の洩れ試験が行われる。 （２）流量試験；開閉弁６_1のみ閉じ、その他の開閉弁
６を全部開ける。流量に応じた音速ノズル１２を選択し
て全部のガスメータ１０に音速ノズルに従った標準流量
を流す。例えば、ガスメータ１０_1においては流量表示
装置１０Cに所定時間の間に指定される流量を測定し、
音速ノズル１２の標準流量と比較される。このとき電磁
弁Ｖ１とＶ４とを閉、Ｖ２とＶ３を閉止して導管２１内
の圧力差に基づいて流量の圧力補正を行う。音速ノズル
入口圧力の補正も同様に行う。以下ガスメータの最大流
量までのガスメータの指示誤差が求められている。 （３）差圧試験；ガスメータ１０の最大流量において、
例えば、ガスメータ１０_1の場合、ガスメータの流入口
１０ａと流出口１０ｂ側との間の差圧を測る。しかし、
ガスメータ１０_1内の圧力は大気圧以下であるから導管
２１の電磁弁Ｖ１開，Ｖ２閉，導管２２の電磁弁Ｖ３
閉，Ｖ４開で、共に、大気基準圧力ライン２０を基準圧
力とした流入口１０ａ側及び流出口１０ｂ側圧力を差圧
検出器２３と２４とで読み、各々の読みの差から差圧を
求める。The operation of the gas meter calibration device of the invention shown in FIG. 1 will be described below. (1) leakage tests; off valve 6_ 2 closed and 6 n, Additional gas meter line 9 by opening the on-off valve 6 is introduced from the pressurized air source 2, 10 kp by a precision pressure reducing valve 5
The adjusted reference pressure adjusted to a is introduced. Gas meter 1
Leakage tests 0_ 1, the inflow, the outflow-side on-off valve 6-3 6-
4 and sealed air closed gas meter 10_ pressure reference pressure in one of a predetermined time, the pressure drop due to leakage of a period of for example 3 minutes, for example, a pass equal to or less than 200 Pa (Pascal). This pressure drop is caused by closing the solenoid valves V1 and V4 and opening V2 and V3.
The differential pressure between the inlet port 10a of _ 1 and the atmospheric reference pressure line 20 is measured by the differential pressure transmitter 23. The outside air introduction pipe 2 is opened by opening the solenoid valve 5 in the atmospheric pressure reference line 20.
Atmospheric pressure is introduced from 5, and after the introduction, the solenoid valve V5 is closed to maintain a constant atmospheric reference pressure. However, since pressure fluctuations occur due to changes in room temperature, the absolute pressure gauge 26 is used for measurement. Thereafter, the same leak test with other gas meter 10-i also gas meter 10_ 1 is performed. (2) the flow rate test; only closed-off valve 6_ 1, open the other opening and closing valve 6 total. The sonic nozzle 12 is selected according to the flow rate, and the standard flow rate according to the sonic nozzle is supplied to all the gas meters 10. For example, the flow rate specified for a predetermined time flow rate display device 10 C measured in the gas meter 10_ 1,
The standard flow rate of the sonic nozzle 12 is compared. At this time, the electromagnetic valves V1 and V4 are closed and V2 and V3 are closed to correct the flow rate pressure based on the pressure difference in the conduit 21. The sonic nozzle inlet pressure is similarly corrected. Below, the indication error of the gas meter up to the maximum flow rate of the gas meter is required. (3) Differential pressure test; at the maximum flow rate of the gas meter 10,
For example, if the gas meter 10_ 1, measures the pressure difference between the inlet 10a and the outlet 10b side of the gas meter. But,
Gas meter pressure 10_ 1 solenoid valve V1 open since it is lower than the atmospheric pressure conduit 21, V2 closed, solenoid valve conduit 22 V3
With both closed and V4 open, the pressures at the inlet 10a side and the outlet 10b side with the atmospheric reference pressure line 20 as the reference pressure are read by the differential pressure detectors 23 and 24, and the differential pressure is obtained from the difference between the readings. .
【００１７】[0017]
【効果】以上の説明から明らかなように、本発明による
と、以下のような効果がある。上述のように、洩れ試験
と流量試験及び差圧試験など、ガスメータの試験項目の
試験においては、すべて、大気基準圧力ライン２０の圧
力を基準として測定され、しかも、この圧力は絶対圧力
計２６により精密に測定され、基準圧力の補正が行われ
るので、常に高精度で安定した測定結果が得られる。ま
た、差圧検出器２３，２４…は、狭い範囲の圧力を拡大
して用いられるので、測定圧力は絶対圧力計２６の読み
に対し小さく、高精度の差圧検出器でなくても相対的に
高精度に洩れ量、その他の試験が得られる。As is apparent from the above description, the present invention has the following effects. As described above, in the tests of the test items of the gas meter, such as the leak test, the flow rate test, and the differential pressure test, all are measured with the pressure of the atmospheric reference pressure line 20 as a reference, and this pressure is measured by the absolute pressure gauge 26. Since the measurement is performed accurately and the reference pressure is corrected, stable and highly accurate measurement results can always be obtained. Further, since the differential pressure detectors 23, 24 ... Are used by enlarging the pressure in a narrow range, the measured pressure is small compared to the reading of the absolute pressure gauge 26, and even if the differential pressure detector is not a highly accurate differential pressure detector, Highly accurate leak amount and other tests can be obtained.
【図１】 本発明におけるガスメータ校正装置を説明す
るためのブロック図である。FIG. 1 is a block diagram for explaining a gas meter calibration device according to the present invention.
【図２】 従来のガスメータ校正装置を説明するための
ブロック図である。FIG. 2 is a block diagram for explaining a conventional gas meter calibration device.
１…加圧空気ライン、２…加圧空気源、３…フイルタ、
４…ミストセパレータ、５…精密減圧弁、６…開閉弁、
７…サイレンサ、８…大気ライン、９…ガスメータライ
ン、１０…ガスメータ、１１…ＳＶメータユニット、１
２…音速ノズル、１３…整流管、１４…流入口、１５…
流出口、１７…弁、１８…ストレーナ、１９…真空ポン
プ、２０…大気基準圧力ライン、２１，２２，２７…導
管、２３，２４…差圧発信器、２５…大気開放管、２６
…絶対圧力計。1 ... Pressurized air line, 2 ... Pressurized air source, 3 ... Filter,
4 ... Mist separator, 5 ... Precision pressure reducing valve, 6 ... Open / close valve,
7 ... Silencer, 8 ... Atmosphere line, 9 ... Gas meter line, 10 ... Gas meter, 11 ... SV meter unit, 1
2 ... Sonic nozzle, 13 ... Rectifier tube, 14 ... Inlet port, 15 ...
Outflow port, 17 ... Valve, 18 ... Strainer, 19 ... Vacuum pump, 20 ... Atmospheric reference pressure line, 21, 22, 27 ... Conduit, 23, 24 ... Differential pressure transmitter, 25 ... Atmosphere opening pipe, 26
… Absolute pressure gauge.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石橋 雅裕 茨城県つくば市梅園一丁目１番４ 工業技 術院 計量研究所内 (72)発明者 大槻 作治郎 東京都新宿区上落合３丁目10番８号 オー バル機器工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masahiro Ishibashi 1-4 Umezono, Tsukuba-shi, Ibaraki Institute of Industrial Science and Technology (72) Inventor Sakujiro Otsuki 3-10-8 Kamiochiai, Shinjuku-ku, Tokyo Oval Equipment Industry Co., Ltd.
Claims (3)
スメータに一定圧の空気を印加する高圧基準圧力源と、
流量試験及び差圧試験を行うために大気を吸込む空気吸
込部と、流入流出口を開閉可能な弁を有するガスメータ
を複数直列に接続したガスメータラインと、複数の音速
ノズルを切替可能に配設したＳＶメータユニットと、真
空ポンプとを順次直列接続したガスメータ試験ライン
と；切替可能に大気と連通し大気圧を保持する基準圧力
ラインと；前記複数のガスメータの流入口と流出口とを
各々切替可能に前記基準圧力ラインに接続する複数の導
管と；前記基準圧力ライン及びＳＶメータユニットの上
流側の圧力を測定する絶対圧力計と；前記各々のガスメ
ータの流入口と流出口と前記基準圧力ライン間の圧力を
各々測定する差圧計とからなり、ガスメータの圧力補
正、洩れ及び差圧を前記基準圧力ラインの絶対圧力を基
準として前記差圧計の読みから検知することを特徴とす
るガスメータ校正装置。1. A high pressure reference pressure source for applying a constant pressure of air to a gas meter to perform a leak test of the gas meter,
An air suction part that sucks in the atmosphere for performing a flow rate test and a differential pressure test, a gas meter line in which a plurality of gas meters having valves capable of opening and closing the inflow and outflow ports are connected in series, and a plurality of sonic nozzles are switchably arranged. A gas meter test line in which an SV meter unit and a vacuum pump are sequentially connected in series; a reference pressure line that is switchably connected to the atmosphere to maintain atmospheric pressure; and an inflow port and an outflow port of each of the plurality of gas meters can be switched. A plurality of conduits connected to the reference pressure line; an absolute pressure gauge for measuring the pressure on the upstream side of the reference pressure line and the SV meter unit; between the inlet and outlet of each gas meter and the reference pressure line And a differential pressure gauge for measuring the pressure of each of the differential pressure gauge of the gas meter based on the absolute pressure of the reference pressure line for pressure correction, leakage and differential pressure of the gas meter. Gas meter calibration device, characterized in that the detection from the body.
音速ノズルの上流側に整流管を配設したことを特徴とす
る請求項１記載のガスメータ校正装置。2. The gas meter calibration device according to claim 1, wherein a rectifying tube is provided upstream of each sonic nozzle provided in the SV meter unit.
配設したことを特徴とする請求項１又は２記載のガスメ
ータ校正装置。3. The gas meter calibration device according to claim 1, wherein a silencer is provided at the air suction port of the air suction section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26812892A JP3184885B2 (en) | 1992-09-10 | 1992-09-10 | Gas meter calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26812892A JP3184885B2 (en) | 1992-09-10 | 1992-09-10 | Gas meter calibration device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07243898A true JPH07243898A (en) | 1995-09-19 |
| JP3184885B2 JP3184885B2 (en) | 2001-07-09 |
Family
ID=17454276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26812892A Expired - Lifetime JP3184885B2 (en) | 1992-09-10 | 1992-09-10 | Gas meter calibration device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3184885B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009145986A (en) * | 2007-12-11 | 2009-07-02 | Fujikin Inc | Pressure-controlled type flow rate reference unit and corrosion-resistant pressure type flow rate control unit |
| KR100907875B1 (en) * | 2008-08-22 | 2009-07-16 | 주식회사 대덕기술 | Gas meter testing system and testing method therewith |
| KR100983948B1 (en) | 2010-05-06 | 2010-09-27 | 김성환 | Portable flow meter |
| KR101009741B1 (en) * | 2008-11-06 | 2011-01-19 | 한국전력공사 | Apparatus for simulating fluid leakage of valve |
| JP2012146321A (en) * | 2012-03-13 | 2012-08-02 | Fujikin Inc | Corrosion-resistant pressure type flow rate controller for reference pressure type flow rate controller constituting pressure control type flow rate reference unit |
| CN105953870A (en) * | 2016-07-18 | 2016-09-21 | 苏州北通智能科技有限公司 | Automatic water meter test board |
| CN106353030A (en) * | 2015-07-24 | 2017-01-25 | 常州市汇丰船舶附件制造有限公司 | Reference atmospheric pressure based micro-overpressure detection method and detection device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5672621B1 (en) * | 2013-10-30 | 2015-02-18 | 独立行政法人産業技術総合研究所 | 3-way selector valve |
-
1992
- 1992-09-10 JP JP26812892A patent/JP3184885B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009145986A (en) * | 2007-12-11 | 2009-07-02 | Fujikin Inc | Pressure-controlled type flow rate reference unit and corrosion-resistant pressure type flow rate control unit |
| KR100907875B1 (en) * | 2008-08-22 | 2009-07-16 | 주식회사 대덕기술 | Gas meter testing system and testing method therewith |
| KR101009741B1 (en) * | 2008-11-06 | 2011-01-19 | 한국전력공사 | Apparatus for simulating fluid leakage of valve |
| KR100983948B1 (en) | 2010-05-06 | 2010-09-27 | 김성환 | Portable flow meter |
| JP2012146321A (en) * | 2012-03-13 | 2012-08-02 | Fujikin Inc | Corrosion-resistant pressure type flow rate controller for reference pressure type flow rate controller constituting pressure control type flow rate reference unit |
| CN106353030A (en) * | 2015-07-24 | 2017-01-25 | 常州市汇丰船舶附件制造有限公司 | Reference atmospheric pressure based micro-overpressure detection method and detection device |
| CN106353030B (en) * | 2015-07-24 | 2022-04-19 | 常州市汇丰船舶附件制造有限公司 | Atmospheric reference pressure-based micro-overpressure detection method and detection device thereof |
| CN105953870A (en) * | 2016-07-18 | 2016-09-21 | 苏州北通智能科技有限公司 | Automatic water meter test board |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3184885B2 (en) | 2001-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101796378B (en) | Mass flow verifiers capable of providing different volumes, and related methods | |
| CN107036769A (en) | A kind of system and method for being used to calibrate different probe gas vacuum leak leak rates | |
| US8752412B2 (en) | Sniffing leak detector | |
| US11874199B2 (en) | Device and process for determining the size of a leak hole in a sample | |
| JP5525374B2 (en) | Flow rate standard and flow rate calibration method using the same | |
| NZ503356A (en) | Leak testing system for pipes | |
| CN206161253U (en) | Air conditioner tuber pipe air leakage detection device | |
| CN209910924U (en) | Check valve gas testing system | |
| US9429493B2 (en) | Manifold assembly for a portable leak tester | |
| US8201438B1 (en) | Detection of gas leakage | |
| CN103822765A (en) | Device for detecting air leakage rate of large-scale ventilating device | |
| JP3184885B2 (en) | Gas meter calibration device | |
| US6729177B2 (en) | Method and apparatus for inspecting for airtightness failure | |
| JP2012032351A (en) | Leakage inspection apparatus and leakage inspection method | |
| CN103837215B (en) | Commutation valve type p.V.T.t method gas flow meter | |
| JPH02190743A (en) | Gas density measuring apparatus | |
| DE502005001657D1 (en) | Tightness test of the main air line of a train | |
| CN106153162B (en) | Gas flowmeter detection equipment | |
| JPH06235680A (en) | Method and equipment for testing check valve | |
| CN203772508U (en) | Large-scale ventilating device air leakage rate detector | |
| CN215811476U (en) | Flow type air tightness testing device | |
| JP3715543B2 (en) | Airtight performance test method | |
| US6959610B1 (en) | Manual purge system for instrumentation flow element tubing | |
| CN107966252A (en) | A kind of leakage amount detector of micrometeor air seal | |
| JP3875885B2 (en) | Airtight test method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080511 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090511 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090511 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100511 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100511 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110511 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110511 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120511 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130511 Year of fee payment: 12 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130511 Year of fee payment: 12 |