BS ISO 12809:2011 pdf download – Crop protection equipment — Reciprocating positive displacement pumps and centrifugal pumps — Test methods 4 Accuracy of measurements Temperatures shall be measured with an accuracy of ±1 °C. Length shall be measured with an accuracy of ±1 mm. Suction pressure shall be measured with an accuracy of ±1 kPa. Delivery pressure shall be measured with an accuracy of ±1 % of the full scale. The full-scale value shall not exceed twice the maximum value that has to be measured during the test. Rotating speed shall be measured with an accuracy of ±1 %. Flow rate shall be measured with an accuracy of ±1,5 %. Load torque shall be measured with an accuracy of ±5 %, at least for values greater than the 25 % of the maximum torque. 5 Test liquid Clean water without solids in suspension. 6 General test conditions 6.1 Test bench 6.1.1 The test bench shall have a main circuit containing the devices for fow control and pressure adjustment. To simulate the installation of the pump on the sprayer, the test bench shall have a “nozzle line” (section A in Figure 1) and an extra circuit (section B in Figure 1) able to simulate the cleaning conditions, with part of the fow coming back directly to the suction line of the pump. 6.1.2 The suction line connects the pump with the tank. It shall be ftted with an air inlet valve, a suction pressure adjustment valve and a suction pressure gauge. For self-priming pumps, the h value shall be (400 ± 100) mm. For non-self-priming pumps, the h value shall be (−100 ± 20) mm. The start of the suction line shall be free, without non-return valves. See Figure 1. 6.1.3 The delivery line shall be ftted with a pressure gauge, a pressure adjustment valve and the device for fow rate measurement (see Figure 1). The output of the delivery line shall be connected to the tank in order to guarantee the re-circulation of the test liquid. Ensure that the back fow does not create turbulence in the suction line. 6.1.4 The extra circuit shall be ftted with a by-pass fow-rate adjustment valve and a shut-off valve able to isolate this part of the circuit. 6.1.5 The level of the liquid in the tank shall be equal (±10 mm) to the top of the pump housing. Set the level when all...
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