Control.com - Nerds in Control

Hi,

I am looking forward to implement PID for water tank level control using Microcontroller.
I am facing difficulty to select sensors & components related to it.

To measure tank level i can use ultrasonic, hydrostatic pressure, capacitive and float sensor.
I can collect data for tank level into microcontroller from above mentioned sensors.

But i do not have much idea about following sensors :---

1> Sensor to measure water feed out of the tank ?

2> Which feed Valve to use to feed water into the tank ?
Suggest something which i can control using microcontroller ?

3> Also can solenoid valve can be used to control water feed into the tank.

Please try to suggest some less expensive sensor for which i can write control software in microcontroller to make an efficient system.

Please suggest on above points.

kind regards,
allan

> To measure tank level i can use ultrasonic, hydrostatic pressure,

Hydrostatic pressure is very reliable

> 1> Sensor to measure water feed out of the tank ?

An orifice plate with DP cell, a Magnetic flowmeter ot Vortex shedding fowmeter

> Which feed Valve to use to feed water into the tank ? A globe or ball valve withelectric actuator
> Also can solenoid valve can be used to control vater feed into the tank.

Not the best choice if you are using PID, solenoids are more for On/Off control

> Not the best choice if you are using PID, solenoids are more for On/Off control

I was traveling so not able to reply, thanks for your reply Roy.

Can you suggest some part number from some vendor related to feed valve.

> An orifice plate with DP cell, a Magnetic flowmeter ot Vortex shedding fowmeter

Can you suggest some part number from some vendor related to it.

Please suggest on this.

Hi Allan

> 1. Sensor to measure water feed out of the tank?

example: Compact orifice flowmeter like Emerson (3051SF), Siemens (SITRANS)

> 3. Also can solenoid valve can be used to control water feed into the tank.

Can you give us the volume of the tank and the value of inlet/outlet flow?

May be an on/off control mode is enough according to these values. the PID control is not always adapted to some process with large delay (dead time).

regards
Bruno