Electrical scheme of the flowmeter

Electrical scheme of the flowmeter. The indicator of the of the pontoon-magnetic flowmeter consists of the case 2, that is made from the non-magnetic steel 12X18891 where the ferromagnetic pontoon 9 is placed.

The internal part of the case smoothes, and then polishes.

If it is necessary there can be thin wall glass pipe placed with the calibrated internal hole that is thickened by the exposit compound.

Outside the case the solenoid 5 is placed, that creates the electromagnetic field of the alternating current.

This field stops the pontoon in the central position for this two ferromagnetic ring 4 and cylindrical 6 insertions.

Solenoid is bounded by the geometrical mantel кожух that is made by both cover 12 and case 17. Connections of the output ends of the solenoid 14 with connection line 19 are performed with a help of plug in freely cancelled separations 16 in the hermetical camera 15. The connection line that passes through the metallic tube 20 that is connected to the camera 15 with a help of the plug in connection.

Expense indicator flows through by the compressed air that is transformed by the tube 8 in the internal part between the mantel and solenoid.

The plug in connection 1 makes up the expense indicator connection with the technological pipeline.

Nuts 13 are used for the thickness of the non-magnetic sleeve 3, that bounds the motion of the pontoon 9 during the cut off of the solenoid from the measuring scheme. The indicator is mounted straightly vertical. The measuring flow is passed from down to up. Due to action of the magnetic field the pontoon takes the central place. It displaces a little bit down from the center of the solenoid under action of its own weight. Indicator of the triple wired line through the pontoon by the contacts 3,4,5 it connects by the measuring block.

With the help of the resistances R2, R, R it makes up the measuring bridge on the diagonal of which the voltage from the inducting coil 3 is given of the dividing transformator Tp1. From the second diagonal the voltage of the misbalance goes through the first card S1-1of the switch P1 on the dido rectifier D1. The switch P1 has 3 positions Stage 0, Calibration and Work. For the extraction of the diode non-linearity in the points of the pontoon indicator displacement in the scheme is produced by including the additional voltage in parallel with the measuring bridge, that is putted from the coil 1Y that replaces the working point of the diode D1 in the linear domain.

The compensation of the rectified voltage that is made with a help of the capacitor C1 during the balanced bridge, makes up by the reversible by the polarity voltage, that is taken from the coil Y and is passed by the capacitor C1 through the diode D2. The registration of the matter is provided with the help of measuring of the voktage on the integrated capacitor C1 by the pointer indicator IP-1 or by the registered electronic potentiometer KCP-3. The device takes the energy from the ferroresonanse stabilizer FSN of the C-0,09 type. In the first stage of the switch P1 by the change of the resistor R7 the zero voltage is approximated on the capacitor C1 due to the balancing of the measuring bridge.

In the second stage the measuring bridge is connected and resistors R5, R9 are switched by the registration device IP-1 or KCP-3 on the calibration indication.

The third stage is proportional to the switching on of the expense device measurement. The gaseous clocks GCB-400 and the glass rotameters perform the control of the expense. The output voltage as in the first case we can measure from the resistor R11. Figure 3. Figure 4. Figure 5.