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The rotary propeller flow meter is a hydrological instrument commonly used in my country, which uses a propeller as a sensing element;
Generally, rivers, canals, reservoirs and other water sections It is a traditional and reliable hydrological flow meter that measures the average velocity of water flow at the measuring point to determine the flow rate at the cross section.
Now we introduce the most common errors and troubleshooting methods in daily use.
The water flow velocity meter is not accurate when measuring.
When using the flow meter, if you find that the rotating parts are loose or move axially, or the gap between the pulp sleeve and the shaft is too large, you should stop using it immediately and carry out inspection.
If the rotating parts are looser or move axially, there are three possible causes of error:
First, the adjusting screw at the conical end is too loose. The propeller shaft is not tightened, causing the propeller shaft components to move axially.
When measuring the flow, if the adjusting screw on the tapered end is not firmly seated in the groove of the propeller shaft, the entire rotating part may fall off the frame.
When this phenomenon occurs, the instrument cannot be placed in the water to measure the flow, and the screws must be tightened to adjust the instrument.
The second reason is that the parallel fixing screws are not tightened, which causes the gap between the ball bearings to be too large, which affects the accuracy of flow measurement. In this case, the instrument must be dismantled and the cylinder screws must be tightened.
The third isthe assembly gap of the rotating part, i.e. H. the gap between the propeller sleeve and the bearing is not suitable or is too large or too small, which affects the theoretical basis of measurement. In this case a readjustment must be carried out.
Flow Velocity Meter The flow velocity meter does not rotate properly and measurement of flow at low speed is inaccurate.
Troubleshooting method:
Check the rotating part. Hold the frame in your hand and gently blow on the blades with your mouth. The blades should rotate flexibly without any friction or friction. If there is a jamming phenomenon, it should be cleaned again.
When reinstalling the instrument, attention should be paid to the assembly clearance of the outer spacer sleeve, i.e. H. The amount of movement of the outer spacer sleeve between the two bearings is 0.03-0.05 mm, and it shoulde not be too tight or too loose.
The assembly clearance of the rotating parts, i.e. H. The assembly clearance between the propeller sleeve and the bearing must be 0.3-0.4 mm.
?Flow Meter The water flow meter has no signal or sometimes there is no troubleshooting method when there is a signal. First check whether the counter and sound are normal. If normal, check the communication mechanism of the flow meter.
Use a double-strand adhesive line to connect the flow meter signal output and the meter signal input. Turn the paddle. The length of a signal is approximately 3 revolutions. Otherwise, the contact wire should be readjusted, e.g. B. If there is no signal, the contact wire may be burnt due to excessive current, and the contact wire should be replaced.
If the signal is intermittent, the contact wire should be adjustedt be sure that it presses the contact pin correctly.
Pay attention when adjusting. If it is too tight, it will affect sensitivity. If it is too loose, it will touch the **. Adjust the contact wire to ensure the continuous time of a signal is the rotation of the propeller. After about 3 turns, the hanging part of the contact wire should point slightly downwards and form an arc.
If there are oxides on the contact wires and contact pins, it will affect the connection of the circuit. Therefore, they should be disassembled and washed to remove the oxides.
After use, the flow meter should be carefully cleaned, refueled and properly protected. For long-term storage, special care should be taken to remove it for inspection and refueling every six months. The continuous operating time of the instrument is 8 hours. After the time has elapsedThe instrument needs to be cleaned to remove water, sediment, dirt, etc.
