Control of pneumatic diaphragm pumps

Currently, the level of a solvent sump needs to be interlocked with a pneumatic diaphragm pump. When the liquid level reaches a certain height, stop the pneumatic diaphragm pump. But I don’t know how to use the alarm output of the level gauge to control the pneumatic diaphragm pump Is it necessary to add a 2/3 way solenoid valve in the circuit to control the air supply for the pneumatic diaphragm pump, and then use the alarm output from the level gauge to control the on/off of the solenoid valve in order to start and stop the pneumatic diaphragm pump? I searched on the forum, but I still don’t understand it? I’d like to ask everyone!

I’ve heard of pneumatic diaphragm pump heads for the first time, but I think that if the air circuit of a pneumatic diaphragm pump is considered to function like that of a pneumatic control valve, it can be achieved using your method. I don’t know how a pneumatic diaphragm pump works.

Currently, the level of a solvent sump needs to be interlocked with a pneumatic diaphragm pump. When the liquid level reaches a certain height, stop the pneumatic diaphragm pump. But I don’t know how to use the alarm output of the level gauge to control the pneumatic diaphragm pump Is it necessary to add a 2/3 way solenoid valve in the circuit to control the air supply for the pneumatic diaphragm pump, and then use the alarm output from the level gauge to control the on/off of the solenoid valve in order to start and stop the pneumatic diaphragm pump? I searched on the forum, but still didn’t understand it. I’d like to ask everyone!

Are you majoring in process engineering or instrumentation? If you are in the engineering field, you don’t need to worry about it. This is accomplished by electrical instrumentation engineers. The working principle is just as you said.

As you said: it is necessary to add a solenoid valve in the circuit to control the air supply for the pneumatic diaphragm pump, and then use the alarm output from the level gauge to control the on/off of the solenoid valve, thereby enabling the start and stop of the pneumatic diaphragm pump.

There’s no need for such complexity; the simplest approach is to add a secondary gauge to the circuit, which receives signals from the level gauge. By adjusting this secondary gauge, it is possible to control the diaphragm pump either through on/off control or PID control.

Your method can be fully controlled. As for the person on the second floor, there are some issues: the term \"secondary meter\" is too vague; temperature controllers are also considered secondary meters, but they cannot control the liquid level. Additionally, diaphragm pumps can be adjusted using PID control. May I ask the person on the second floor what the principle behind diaphragm pumps is? ? ? ! ! ! Also, I’m not sure if the moderator’s response is correct; I’ll just say that I’m actively participating, haha. This post was last edited by longniu on 2009-2-23 at 13:15.]

A dry-contact level switch is used as an upper-limit trigger to control a 24VDC relay; the auxiliary contacts of this relay then regulate the power supply to the solenoid valve on the on-site diaphragm pump. The high-level signal is also fed into the alarm control circuit to trigger an alarm. An additional selector switch is provided to switch between manual and automatic control modes. It is easier to meet the requirements if there is a PLC or DCS system. One thing to keep in mind: if the operating area of the diaphragm pump is in an explosion-proof zone, you need to consider installing safety barriers in the electrical control circuit or using explosion-proof piping to meet the relevant explosion-proof requirements. Diaphragm pump operation diagram: http://imgsrc.baidu.com/baike/pic/item/509b9fcb6888c2e952664fcc.jpg. This post was last edited by jsnjhu on 2009-2-23 at 14:07.]

I’ve learned it. Thank you to everyone for their replies