| The single-meter calibrating device may be divided into two types: the testing type and the production type. For testing-type ones there is a section of 15D long straight tube separately in front and at the back of water meter position, Such devices are suitable for calibration and full-performance test of water meters in waterworks and water meter testing station, The production-type ones offer a rapid and time-saving application and they are often used by water meter manufacturers. Among the products those water meters calibrating device with a bore over 80mm have equipped with changing-over unit, electric control cubicle, electric flow regulator and two-position four-way solenoid. All operation adopts hydraulic or pneumatic control by buttons. In addition, a rectifier and a section of tube each with a length of 10D, 5D in front and at the back of meter position individually are equipped for the production-type ones. Which makes it possible to test large bore water meters on these devices. To relieve user’s expense for the products the worktable of large-bore devices can be made from ordinary steel instead of stainless steel. And the working measure , meter clamp and changing-over unit are still made from stainless steel.( For specifications of product see table 1、2 below) |
Table1:
|
Size
(mm)
|
Measures
(L)
|
Material
|
Structure
|
Precision
(Grade)
|
Flow rage
(m3/h)
|
Applicable
Water meter
(mm)
|
|
15-25
|
10,20,50,100
|
Fully made of Stainless steel
|
Adopt calabash structure for all
|
0.2
|
0.004-7
|
15,20,25
|
|
15-50
|
10,20,100,300(500)
|
0.04-30
|
15,20,25,40,50
|
|
40-50
|
100,300(500)
|
0.03-30
|
40,50
|
|
Remarks:
1. The working measure with brackets () is of testing-type ones.
2. For testing-type devices the length of the straight tube in front and at the back of meter to be tested is 15 times of D.
3. A glass rotor-type device flow meter is equipped for indication of transient flow.
4. This kind of devices can be used for production test , test after maintenance, weekly test and design test. |
Table2:
|
Size
(mm)
|
Measures
(L)
|
Material
|
Structure
|
Precision
(Grade)
|
Flow rage
(m3/h)
|
Applicable
Water meter
(mm)
|
|
15-100
|
10,20,100,500,
1000(2000)
|
Fully made of Stainless steel or worktable is made of ordinary steel
|
Adopt calabash structure for all
|
0.2
|
0.004-120
|
15,20,25,40,
50,80,100
|
|
80-100
|
100,500,1000(2000)
|
0.3-120
|
80,100
|
|
50-200
|
50,100,200,500(1000),
1000(2000),3000(5000)
|
0.15-600
|
50,80,100,
150,200
|
|
80-200
|
200,500(1000)
1000(2000),3000(5000)
|
0.45-600
|
80,100,150,
200
|
|
Remarks:
1. Ditto 1.
2. For testing-type devices the length of the straight tube in front and at the back of meter
To be to be tested is 15 times of D. As for production-type ones the length is 10 times of D in front of the meter to be tested and 5 times of D at the back of meter.
3. The Changing-over unit, two-position four-way solenoid, electric/pneumatic flow regulator and Electric control cubicle are equipped.
4. All operation adopts electric (DC.24V)/pneumatic control by buttons.
5. Rotary tube-changing, hydraulic top indicator and shunt flow indicator.
6. Used for quality test of products and design test in factory. |
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