15-50mm Water Meter Calibrate Tester
(with liquid place controller, when the water is increased to the place, will auto close off the water flow)
1. Summarize
The tester is the necessary measure instrument for the test and repair of water meter in metrological service, Water meter manufacture, Water supply company, industrial and mining establishments.
The tester is made of stainless steel materials; the surface is treated with polishing. Clamp equipment and drain machine is controlled by four-way reversing valve; the water flow rate is adjusted by copper case stainless steel core ball valve, it has high accuracy, the structure is compaction, long life, easy operate and maintain.
2. Main technical parameter
2.1 The tester accuracy: 0.2
2.2 Tested water meter size:Ф15, Ф20, Ф25,( Ф32), Ф40, Ф50
2.3 Technical criteria for water meter testing: used for full capability test or produce and maintenance
2.4 Instantaneous flow index gauge is adopted glass rotor flowmeter group, the actual measurement accuracy not less than 2.5%
The detail type and specification as following:
LZB-154-90L/h
LZB-2570-700L/h
LZB-50450-7000L/h
LZB-807-30m3/h (Additional for 15-50mm tester)
2.5 Working volume container cubage:
15-25mm，(10L+10L) 20L，(50L+50L) 100L
15-50mm，(10L+10L) 20L，(100L+200L) 300L
2.6 Using water source working pressure: 0.25-0.4MPa
2.7 Clamp equipment flex distance is:
50mm(15-25mm tester),60mm(15-50mm tester)
2.8 Appearance size
15-25mm:
1500×900×2100 (standard tester)
770×900×2100 (produce tester)
2320×900×2100 (in series meter tester)
15-50mm:
2100×1200×2100 (in series meter tester)
1100X1200X2200 (one meter tester)
3 Structure and working principle
The water meter tester is composed by work desk, clamp equipment, front and back straight pipe, flowmeter, standard volume container, drain water valve.
After the water from the steady sources come into the enter place of tester, the water will come into the tested meter in straight pipe, and then come into the choosed standard volume container, compare the reading number between tested meter and standard volume container, and get the error of testing water meter.
4 Operate methods
4.1 Put the tested water meter in the middle of the straight pipe, closed all the flowmeter adjust valves, open the water enter valve, let meter and pipe endure pressure, sure all tie-in place should without leakage.
4.2 first open big flowmeter adjust valves, and let the flux in normal range of water meter.
Second open other flowmeter adjust valves slowly, get rid of the air in the pipe and water meter.
Third after water meter running a period of time, then let water meter finger aim at “Zero?place or one scale,close flowmeter adjust valves,record the subdivision scale of water meter,
Fourth get rid of the water in the standard container (10L-20L, 50L-100L, 100L-300L container discharge time is one minute), then close the discarge values of the containers,now the standard volume container is in "Zero" place.
Fifth operate flowmeter adjst values, let the values to a point flow place of the standard container.
Sixth when the water meter finger reach to the point place or container water place reach to point place, close flowmeter adjust values, the action time for open/close should not more than 1.5s
Seventh after the container water place is stop, reading and record water meter data and standard container data, compare it.
Eight using following expressions calculate the error:
δ=V1-V2/V2×100%
thereinto:
V1—Water meter reading number (display using water quantity)
V2—standard container reading number (real using water quantity)
4.3 in order to have uniform data, the water enter place should have a water pressure steady device, let water source stabilize, and then test water meter.
5. Installation
5.1 The tester should be installed in good light, and breezy place
5.2 Install standard container on the groundsill, adjust water level dunk. Workbench install in the front of the standard container, and let flowmeter’s water out pipe aim to the correct container,and then fixed the container support and workbench.
5.3 Well connect water enter pipe andthe purple copper pipe of the valve,the tie-in place should have not leakage.
5.4 the rotor flowmeter must be vertical installed, can’t deflection.
5.5 in order to easy use and maintain, the enough space should be keeped around the tester.
6. Maintain and notice
6.1 the "O" shape airproof rings is anti-oil rubber, long time use if have leakage, should be changed in time.
6.2 Water-place glass pipe and glass rotor flowmeter, after long time use, maybe have rust cling to the wall, influence reading, can be rinsed by oxalic acid, it will clear like new.
6.3 if valves have leakage, should be changed in time.
6.4 when using rotor flowmeter, the flow adjust valve should be opened slowly, prevent break up glass, especially for 4-90L flowmeter.
6.5 in winter, after using,it should have not water in flowmeter, to prevent frostbite.
