A tank monitor control device is disclosed which comprises a monitoring device for insertion into a day tank to monitor a level of fluid stored in the day tank, a shutoff valve connected between a main storage tank and a diaphragm pump, a solenoid valve connected between an air supply and the diaphragm pump, and a control device connected to the monitoring device for receiving a signal indicative of the level of fluid in the day tank, the control device connected to the shutoff valve and the solenoid valve.

An acid replenishing system includes an acid tank, a draining apparatus, an acid replenishing apparatus, and a control unit. The acid tank contains a used acid solution. The draining apparatus drains an amount of the used acid solution from the acid tank. The acid replenishing apparatus replenishes an amount of a replenishing acid into the acid tank. The control unit controls the draining apparatus and the acid replenishing apparatus to perform a plurality of acid replenishing stages, so a total set amount of the replenishing acid to be added into the acid tank has been replenished.

A draining and flushing mechanism comprises a tank body, a first piston, a fixation rod to assemble the first piston, a main energy-storage spring and a drainage valve; the first piston is assembled inside the tank body and divided the tank body into a top tank and a bottom tank; the bottom tank is a water storage room spaced by the first piston and the tank body at the lower portion of the tank body; the main energy-storage spring is attached to the first piston to push the first piston to the bottom tank; an inlet pipe is connected to the bottom tank; wherein the bottom surface of the bottom tank is disposed with an assembly hole, the drainage valve is connected to the assembly hole and assembled to the outer side of the bottom tank, the drainage valve is disposed with at least a drainage hole.

Disclosed is a sheath delivery system that uses a continuous flow of sheath fluid into a pressurized internal reservoir that substantially matches the outflow of sheath fluid through the nozzle of a flow cytometer. A substantially constant level of the sheath fluid is maintained. If the sheath fluid level falls below a desired level, or goes above a desired level, a dampened control system is used to reach the desired level. In addition, air pressure in the pressurized internal container is controlled so that an external sheath container can be removed and refilled with additional sheath fluid without stopping the sheath delivery system 100. Differences in pressure are detected by a droplet camera, which measures the droplet breakoff point to determine the pressure of the sheath fluid in the nozzle.

Fill level monitoring relates to a method for controlling the fill level of a collecting vessel, wherein the collecting vessel could be filled with a dielectric medium. A fill level is monitored by a monitoring circuit with a measuring capacitor, the capacity of which changes steadily in correlation with the fill level, at least beyond a fill level range of the collecting vessel. The method includes: determining a capacity of the measuring capacitor; determining the quality of the measuring capacitor; determining a permittivity of the dielectric medium on the basis of the quality of the measuring capacitor; determining a fill level of the collecting vessel on the basis of the determined capacity of the measuring capacitor and the permittivity of the dielectric medium; and fill level-dependent drainage of the dielectric medium from the collecting vessel.

An apparatus, system and method for regulating fluid flow are disclosed. The apparatus includes a flow rate sensor and a valve. The flow rate sensor uses images to estimate flow through a drip chamber and then controls the valve based on the estimated flow rate. The valve comprises a rigid housing disposed around the tube in which fluid flow is being controlled. Increasing the pressure in the housing controls the size of the lumen within the tube by deforming the tube, therefore controlling flow through the tube.

A flow control apparatus includes a body, a door, a drip chamber holster, and a valve. The door is pivotally coupled to the body. The drip chamber holster is coupled to one of the body or the door to retain a drip chamber. The valve is disposed within the body and is configured to receive a fluid line coupled to the drip chamber when the door is in an open position. The valve is operatively coupled to the door to secure the fluid line within the valve when the door is in a closed position.