Ultrasonic Water Flow Meter Calibration Test Bench With Fully Automatic Mode

Hebei Shanghong Meters Technology Co., Ltd. is one of the leading manufacturers and suppliers of ultrasonic water flow meter calibration test bench with fully automatic mode in China. If you're going to wholesale high quality ultrasonic water flow meter calibration test bench with fully automatic mode, welcome to get pricelist and quotation from our factory.

Ultrasonic water flow meter calibration test bench with fully automatic mode

 Piston water meter verification device

1. Basic information of the device

1.1 Device flow range: (2-8000)L/h;

1.2 Device uncertainty: ≤0.2% (k=2)

1.3 Pressure range: 0- 1.6MPa;

1.4 Ambient temperature: 15-25℃;

1.5 Relative humidity: (45% -75%);

1.6 Atmospheric pressure: (86-106)kpa;

1.7 Working pressure: 0- 1.6MPa;

1.8 Power supply voltage: 400V±5%, 50HZ;

1.9 Air source pressure: (3.5-6)bar;

1.10 Equipment power: water pump 1.8KW, piston 3KW, heating 6KW;

1.11 Number of inspection meters: Ultrasonic meters (DN15: 14 pcs, DN20: 12 pcs, DN25: 10 pcs);

1.12 Equipment size: length, width, and height (5800 mm *1500 mm *2500mm)

2. Device composition

 This device is composed of a water source system, a piston system, a clamp meter pipeline, a flow adjustment device, a standard device system, a software control system, and a data acquisition system;

2.1 Water source system

 Water pump or piston: the highest flow rate is 8m³/h, using frequency converter control, the software can set different frequencies

Airbag pressure stabilizing tank: used to stabilize the pressure of the pipeline system. The flow rate of Q3 and above uses a water pump for water supply. It is also used to detect bubbles before flushing.

Water tank: 304 stainless steel, the bottom of the water tank is equipped with a liquid level sensor, the software system can collect the current level of the water tank, is equipped with an electric heating device, and the water temperature control accuracy is ±1℃.

2.2 Piston system

 The standard cumulative flow of the piston device is the product of the piston's internal cross-sectional area and the piston displacement in the time period. Therefore, the accurate measurement of the piston displacement is one of the key factors to reduce the uncertainty of the device. The piston cylinder diameter is 215mm, and a temperature and pressure sensor is installed at the piston outlet to compensate for the error of the piston cylinder diameter. In order to improve the accuracy of displacement measurement, this device uses a grating ruler to measure the displacement of the piston. The output signal of the grating ruler is an AB quadrature signal with an accuracy of 1us.

2.3 clamp meter pipeline

The meter inspection pipeline is composed of the meter clamping device, pipeline, on-off valve and so on. The clamping device for the tested meter is also called the meter clamp, which can adjust the distance according to the length of the meter, and can clamp various tested meters freely. This program clamp meter adopts an external cylinder type clamping mechanism, which effectively prevents air leakage caused by damage to the sealing ring caused by excessive use time. The test pipeline is set to meet the clamping requirements of the tested meter. The clamp table of the device uses three optical axes as positioning points. The optical axis is mounted on a stainless steel fixed plate used for wire cutting. The coaxiality is good. The front and rear straight pipe sections are made of POM material. The coefficient of thermal expansion and contraction is very small. The slider adopts numerical control. The machining center is processed at one time.

2.4 Flow regulation control:

The device is equipped with two flow point pipelines, and two electromagnetic flowmeters are used as flow indicating devices. Below 250L, DN2.5 caliber electromagnetic display is used, and above 250L, DN25 electromagnetic display is used. Pistons are used to provide flow below 500L, and water pumps are used to provide flow above 500L. Equipped with a pneumatic regulating valve. PLC adopts PID control mode. According to the feedback of electromagnetic flowmeter, the opening of pneumatic regulating valve is controlled to adjust the set flow.

2.5 Standard system

The device standard device adopts a combination of piston and electronic scale. The device uses piston as the standard device by default <=500l. the="" piston="" can="" provide="" accurate="" instantaneous="" flow.="" you="" also="" use="" a="" high-speed="" counter="" to="" collect="" displacement="" pulse="" of="" grating="" ruler="" achieve="" standard="" volume="" measurement.="" when="">500L, the device uses 150KG/6000E electronic scale as the standard device.

2.6 Software control system

The control system is mainly composed of industrial computer, Siemens S7-200smart system, servo motor, grating ruler, various temperature and pressure sensors, pneumatic ball valve, platform software, etc. The industrial computer has strong anti-interference performance, which can make the verification process more stable and reliable; PLC and servo motors adopt internationally renowned brands with high precision and high reliability, and the control and data processing software are written in accordance with the relevant national verification regulations.

The sensors mainly include temperature sensor and pressure sensor, which are located at the inlet and outlet of the pipeline and the water outlet of the piston. They are respectively used to measure the temperature and pressure of the liquid, and then transmit the information to the PLC and software system in time. The control system has many protections and sound and light alarms, such as low air pressure alarm, low water tank level alarm, meter not in place alarm, piston over temperature alarm, piston over pressure alarm, piston limit alarm, etc.

In this device, the temperature measurement range of the temperature sensor is (0～100)ºC, and the accuracy level is A; the pressure measurement range of the pressure sensor is (0～1.6) MPa, and the accuracy level is not less than 0.5%.

The software of this device is written in Visual studio C#, using Microsoft ACCESS database, the detection process can be written into the database, and the user can modify the control process according to different permissions.

 After the detection, the error data is saved to the database, and the user can query the detection error data at any time.

The software communicates with PLC, electronic scale, high-speed counter, etc. through the RS232 serial port.

The software communicates with the tested water meter through a serial port. The water meter can use infrared, MBUS, RS485, NFC and other signals, but it needs to be converted to an RS232 interface to connect to an industrial computer. The water meter manufacturer also needs to provide a detailed communication protocol. The software communication protocol definition is written into the database, and the user can modify some control codes or return parameter definitions without changing the structure frame.

3. Device configuration selection table

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