by law
According to the relevant laws of water meters, the residential water meter (generally nominal diameter is less than or equal to 50mm, and the common flow is not more than 16m3 / h), the "first forced verification, time use, expired rotation" is implemented, used For a water meter of 6 years (nominal diameter 25mm and below) or 4 years (nominal diameter> 25mm to 50 mm); industrial water meter (general nominal diameter greater than 50 mm or common flow exceeding 16m3 / h) verification cycle is generally 2 years.
Use status quo
For various reasons, ordinary civil water meter cannot perform the prescribed cycle rotation. Once put into use, it is often used for many years, resulting in deterioration of the metering performance of the water meter, and there is a "misalignment" issue. Water meter is more precise measuring instrument, internal gear and gear, worm gear, worm gear, worm and worm, roller and wheel, etc., the wear of components during long-term use will affect the performance of the water meter; in addition to rust, knot Dia, inlet hole, and water supply mesh clogging, impeal spatial position, etc., can cause water meter performance to be deteriorated, causing measurement. The appearance of the new home form is shown in Figure 1. After several years, the typical appearance is shown in Figure 2, and the appearance has been very dirty.
Error trend analysis
For the water meter in Guangzhou, the author is in the water meter in the Guangzhou area, and the 100-year-old data summary results of the 10-year-old data summary are shown in Figure 3. As can be seen from Figure 3, as the use period increases, the probability of loss of the water meter is significantly increased, affecting the fairness of the measurement. Take the three error intervals of 0 <| mpev=""><| e="" |="" ≤10="" *="" mpev,="" 15="" *="" mpev=""><| ≤="" 20="" *="" mpev,="" plotting="" the="" water="" meter="" shown="" in="" figure="" 4="" losing="" trend="" graph.="" for="" water="" meters="" (qualified="" classes)="" of="" 0=""><| e="" |="" ≤1="" *="" mpev,="" as="" the="" increase="" in="" the="" increase="" of="" the="" period="" is="" reduced="" year="" by="" year;="" for="" the="" 5="" *="" mpev=""><| e="" |="" ≤10="" *="" mpev="" water="" meter="" (general="" disapproval="" class),="" there="" is="" almost="" no="" appearance="" in="" 2="" years.="" from="" the="" third="" year,="" it="" reaches="" a="" peak="" to="" the="" 6th="" year;="" for="" the="" 15="" *="" mpev=""><| e="" |="" ≤="" 20="" *="" mpev="" water="" meter="" (severe="" disabled="" class),="" there="" is="" almost="" no="" appearance="" in="" 5="" years,="" since="" the="" sixth="" year,="" it="" has="" increased="" year="" by="" year="" and="" peaks="" to="" the="" 10th="" year.="" it="" can="" be="" seen="" that="" with="" the="" increase="" in="" the="" use="" period,="" the="" probability="" of="" the="" water="" meter="" is="" increased="" year="" by="" year,="" and="" measures="" must="" be="" taken.="" influencing="" factors="" according="" to="" the="" sampling="" analysis,="" there="" is="" a="" main="" reason="" for="" the="" loss="" of="" water="" meter,="" and="" the="" probability="" distribution="" is="" shown="" in="" figure="" 5.="" visible="" water="" meters="" selection,="" installation="" quality,="" water="" supply="" water="" quality="" is="" an="" important="" reason="" for="" the="" loss="" of="" water="" meter.="" 1="" product="" quality="" water="" meter="" is="" missing="" into="" permanent="" and="" temporary="" two="" categories="" during="" use="" cycles.="" among="" them,="" permissive="" impairment="" means="" that="" the="" water="" meter="" component="" process="" is="" not="" up="" to="" the="" factory,="" or="" because="" the="" external="" factors="" make="" the="" water="" meter="" and="" the="" water="" meter="" caused="" by="" the="" production="" of="" wear="" and="" damage,="" only="" by="" replacement="" or="" maintenance;="" and="" temporary="" disability="" is="" due="" to="" the="" accidental="" phenomenon="" generated="" by="" the="" external="" factors,="" the="" internal="" movement="" of="" the="" water="" meter="" is="" not="" damaged.="" if="" it="" can="" be="" found="" in="" time,="" it="" can="" return="" to="" normal="" by="" cleaning.="" obviously,="" the="" product="" quality="" of="" the="" water="" meter="" directly="" affects="" the="" accuracy="" of="" the="" water="" meter,="" so="" there="" must="" be="" a="" water="" meter="" product="" produced="" by="" the="" national="" manufacturing="" measuring="" instrument="" license="" mark="" and="" verified="" the="" qualified="" regular="" manufacturer="" of="" the="" technical="" supervision="" department.="" the="" formal="" manufacturer's="" water="" meter="" appearance="" is="" shown="" in="" figure="" 6.="" instead="" of="" formal="" manufacturers,="" the="" appearance="" of="" the="" product="" is="" shown="" in="" figure="" 7.="" 2="" water="" meter="" selection="" the="" selection="" of="" the="" water="" meter="" also="" directly="" affects="" the="" use="" of="" water="" meters.="" the="" selection="" includes="" the="" caliber="" (flow="" range),="" a="" flow="" range="" of="" the="" water="" meter,="" mechanical="" structure,="" material,="" water="" quality,="" etc.="" the="" choice="" of="" water="" meter="" caliber="" should="" ensure="" that="" the="" normal="" water="" flow="" of="" the="" user="" is="" between="" the="" model="" common="" flow="" and="" the="" minimum="" flow;="" when="" the="" water="" quality="" can="" be="" used,="" the="" volume="" water="" meter="" can="" be="" used,="" and="" the="" rotor="" water="" meter="" should="" be="" used,="" and="" the="" diameter="" should="" be="" a="" screwd="" water="" meter.="" mainly;="" when="" the="" pipeline="" pressure="" is="" large,="" the="" water="" meter="" of="" the="" engineering="" plastic="" material="" is="" not="" suitable,="" and="" the="" stainless="" steel="" water="" meter="" should="" be="" considered="" when="" the="" water="" quality="" is="" poor.="" 3="" installation="" quality="" the="" installation="" quality="" of="" the="" water="" meter="" includes="" the="" technical="" requirements="" of="" the="" installation="" position,="" the="" environment,="" and="" the="" installation="" process.="" the="" survey="" found="" that="" the="" problem="" of="" impairment="" due="" to="" the="" installation="" quality="" has="" accounted="" for="" more="" than="" 50%.="" the="" installation="" location="" is="" not="" easy="" to="" make="" the="" water="" meter="" are="" affected="" by="" the="" variation="" of="" external="" vibration="" and="" pipeline="" water="" pressure,="" so="" that="" the="" water="" meter="" core="" wear="" is="" intensified;="" the="" impact="" of="" the="" inclination,="" the="" straight="" pipe="" segment="" before="" and="" after="" the="" installation="" position="" is="" also="" very;="" in="" addition,="" the="" water="" meter="" installation="" environment="" is="" too="" humid,="" directly="" in="" the="" sun,="" or="" eroded="" with="" organic="" gas,="" it="" will="" accelerate="" rust="" in="" the="" water="" meter.="" therefore,="" the="" scientific="" rationality="" of="" the="" installation="" position="" and="" installation="" method="" of="" the="" water="" meter="" should="" be="" guaranteed.="" 4="" water="" supply="" according="" to="" the="" survey,="" the="" worse="" water="" quality="" of="" urban="" water="" supply,="" the="" lower="" the="" water="" meter="" accuracy.="" there="" are="" two="" main="" situations="" in="" the="" water="" gauge="" accuracy="" of="" water="" supply="" water="" quality:="" the="" first="" is="" the="" solid="" impurity="" particles="" in="" the="" water,="" such="" as="" sand,="" hemp,="" pipe,="" wall="" release,="" etc.,="" etc="" .;="" the="" second="" is="" that="" the="" organic="" matter="" contained="" in="" water,="" inorganic="" matter="" (such="" as="" iron,="" salt,="" etc.)="" exceeds="" the="" standard,="" which="" is="" easy="" to="" cause="" internal="" corrosion="" of="" the="" water="" meter.="" both="" of="" these="" situations="" cause="" water="" meter="" meters.="" of="" course,="" the="" quality="" of="" water="" supply="" and="" water="" pipes="" also="" has="" a="" big="" relationship.="" as="" shown="" in="" figure="" 8,="" such="" rust-resistant="" residual="" water="" pipes="" will="" apparently="" cause="" water="" quality.="" 5="" usage="" habit="" some="" of="" the="" user's="" use="" of="" water="" will="" also="" indirectly="" affect="" the="" measurement="" accuracy="" of="" the="" water="" meter.="" some="" users="" have="" a="" small="" amount="" of="" water,="" a="" flow="" of="" drops,="" at="" which="" point="" the="" old="" model="" of="" the="" start="" of="" the="" standard,="" the="" reading="" is="" not="" moving;="" some="" users="" have="" frequently="" opened,="" guanwei="" faucets,="" will="" also="" cause="" metering="" error,="" mainly="" because="" the="" impeller="" has="" a="" large="" inertness="" when="" it="" starts="" to="" rotate,="" only="" when="" the="" use="" is="" continuously="" used,="" and="" the="" air="" is="" mixed="" in="" the="" water="" meter,="" and="" the="" remaining="" air="" hysteresis="" is="" on="" the="" adjustment="" plate,="" so="" that="" the="" adjustment="" board="" is="" counterattable.="" the="" role="" is="" obviously="" weakened,="" and="" the="" effect="" will="" only="" be="" eliminated="" after="" the="" air="" is="" discharged.="" countermeasure="" aiming="" at="" the="" main="" factors="" caused="" by="" water="" meter,="" in="" order="" to="" ensure="" the="" measurement="" of="" production="" and="" use="" water,="" the="" following="" measures="" are="" proposed="" for="" reference.="" (1)="" strengthen="" the="" management="" of="" water="" meter="" manufacturing="" and="" measurement,="" put="" good="" water="" meters="" production;="" at="" least="" two="" water="" meters="" of="" water="" meter="" products,="" and="" make="" inferior="" water="" meters="" without="" survival="" space.="" (2)="" according="" to="" the="" on-site="" water="" flow="" range,="" water="" quality,="" working="" environment,="" etc.,="" conscientiously="" do="" a="" good="" job="" in="" water="" meter="" selection,="" if="" necessary,="" ask="" the="" industry="" experts="" to="" check.="" (3)="" put="" the="" quality="" of="" the="" water="" table="" on="" site;="" strictly="" control="" the="" factory="" turbidity,="" prevent="" the="" filter,="" deep="" well="" leakage,="" regular="" cleaning="" the="" water;="" strictly="" implement="" pipe="" laying,="" repair="" the="" rinsing,="" sewage,="" and="" improve="" the="" inner="" wall="" coating="" of="" the="" pipeline="" quality,="" replacement="" of="" the="" residual="" water="" pipe.="" (4)="" strengthening="" the="" implementation="" of="" jjg162="" -="" 2009="" "cold="" water="" water="" water="" water="" water="" water="" water="" measures",="" do="" a="" good="" job="" in="" the="" first="" verification="" of="" water="" meters,="" cycle="" verification="" work;="" vigorously="" promote="" the="" system="" of="" high="" inspection="" and="" preferences="" to="" ensure="" the="" periodic="" verification="" of="" water="" meters="" according="" to="" law.="" conclude="" the="" issue="" of="" misalignment="" in="" using="" medium="" water="" meters="" has="" always="" been="" a="" focus="" issue="" that="" plagues="" the="" water="" meter="" metering="" industry.="" it="" is="" grateful="" that="" some="" targeted="" research="" work="" has="" emerged.="" based="" on="" the="" decade="" of="" experimental="" research="" data,="" the="" author="" proposed="" five="" main="" factors="" that="" affect="" water="" gauge="" metrology="" performance,="" and="" give="" corresponding="" resolution="" countermeasures="" to="" reduce="" the="" probability="" of="" incorporation="" of="" water="" meter="" metrology.="" at="" the="" same="" time,="" this="" paper="" also="" has="" a="" high="" reference="" value="" for="" the="" technical="" innovation="" of="" urban="" water="" supply="" sectors="" and="" technical="" management="" departments.="" ,="" reading="" full="" text,="" original="" title:="" analysis="" of="" the="" current="" situation="" of="" cold="" water="" meter="" and="" discussion="" article="" source:="" [micro="" signal:="" ww_cgqjs,="" wechat="" public="" number:="" sensor="" technology]="" welcome="" to="" add="" attention!="" please="" indicate="" the="" source="" of="" the="" article.="">
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