Dosage with flowmeter en pump

[A.J]

Hallo everyone,

 

I Have a question about how to get a accurend measerument withe a flowmeter. Because oli is added based on the flow.

The flowmeter specs:

Signal:        4 - 20mA signal. 

Capacity:    0 - 18000kg/H

 

Specs Dosing pump:

Signal speed controle:   4-20mA

capacity:                         160L/H

 

Specs plc:

FX5U,  analog->digital card, digital -> analog card. 

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What I whas thinking is:

Flowmeter: 

4mA            20mA

0 kg/h        18000kg/h

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 1mA  = Delta T mA /  max KG-H

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Delta T16

Max kg/H18000

1 mA =1125kg

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For the Dosing pump:

Doseerpomp

0     50Hz

0     150L/H

number liter per Hz =   Hz/L         = 0,333333333

Speed controle  4mA          20mA

 1mA =   Delta  Hz /  Delta  mA 

Delta mA16

Delta Hz50

1 mA  speed to Hz = 3,125Hz

 

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Questions:

Do I use the write formules?

And how can I make thit wurks the best?

 

 

Thank you for your time.

 

Greetings

[VeeB]

A.J do not see mistakes in the formula's.
The correct operation of your control setup depends on the desired accuracy. (for instance the output of the pump will normally not be lineair with the rotation speed of the frequency drive)

Maybe you have the option to connect the flow meter via a protocol? Modbus TCP/IP for example?
Connecting the FX5U series via Ethernet Modbus TCP/IP to a flow meter ensures exact reading of the flow and eliminates the quite high fault rate against 4-20mA signal.
In the FX5U use Simple Ethernet communication for Modbus TCP/IP communication (Read / Write)