Test Bench - BTB-7

The test bench carries out the performance tests of the residential watermeters. Gravimetric system is used as the measurement system. The tests and calibrations of the watermeters are applied by means of the water tank placed on a weighing scale. In the gravimetric system, the water passed through the water meter is collected in the water tank and its weight are measured by the weighing scale placed under the tank. The measurement error percentage is calculated by comparing the value of volume taken from the watermeter display and his value taken from the weighing scale. Maximum working pressure is between 10bar and 16bar as optional.

The test bench main frame is consist of, steel skeleton and stainless sheet metal combination. Steel skeleton is plated with wet epoxy paint. There is a pneumatic regulator for providing constant air pressure. Space connecting pipes is made of P.O.M. and protected against shock and bending.

Qualifications of Test Bench

On this test bench, it is possible to calibrate cold watermeters having nominal diameters DN15 to DN25. It is possible to test watermeters at flowrates of 10 l/h to 10.000 l/h.

The test bench has three lines in order to adjust the flowrate between 10 l/h and 10.000 l/h. On big flowmeter 1000 l/h and 10.000 l/h, on middle flowmeter 1000 l/h and 100 l/h, on small flowmeter 10 l/h and 100 l/h flowrates are adjustable.

They are entirely made of shock-proof plastic materials. They also suited for operation with corrosive liquids such as caustic soda or hydrochloric acid. Measurement tubes are made of PVC. The float in the measurement tubes are made of AISI 316 stainless steel. Float stops are made of polypropylene. Maximum working temperature is 60°C. It has a accuracy of ± 2 %.

Weighing Scale

It has a maximum measurement capacity of 200kg. It has five-digit display. Its resolution is 20gr. It works on 220 VAC, 50HZ voltage. (it does not effected of voltage reductions down to 170 VAC)

Before starting the scale, the water balance scale shall be adjusted by turning the lever with four screws. The air bubble shall be placed on the centre as shown below. Therefore the weighing scale is on the balance.