# Scale For weighing a 20 Kg Gas Bottle using a load Cell Need help please with circuit Diagram

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#### RodneyB

Joined Apr 28, 2012
697
Hi

I am tired of running out of gas in the middle of cooking. I would like to build a very basic scale to give me an indication of the gas I have left in the cylinder.

I was looking at my component suppliers website and came across a 50 Kg load cell.

I have attached the datasheet which basically tells me nothing.

The price of the load cell is favorable providing I dont have to buy to many more expensive pieces of equipment.

I want to connect it to my GSM telemetry equipment which has a 4-20 mA or 0 - 10 Volt input.

I can then add behavior statements that will send me notifications of the gas left and a warning when the gas gets low.

I am asking for a circuit diagram or some direction to making this basic scale.

Many thanks in Advance.

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#### Reloadron

Joined Jan 15, 2015
6,549
The Data Sheet tells me:
CAPACITY 50Kg
SENSITIVITY 1.0mV/V
EXCITATION 10VDC

So with a maximum Excitation of 10 VDC with a Capacity load of 50 Kg the output will be 10 mV. and if I multiply that X 100 my Full Scale out would be 1.0 Volts. Multiply times 1000 and full scale voltage out is 10 volts, so 0 to F/S = 0 to 10 Volts. When using load cells it is important, very important to have a stable reference (Excitation). A Google of 10 Volt Reference will likely bring up a dozen hits on suitable regulators. A lesser Excitation voltage will yield a lesser full scale out voltage. You would run the voltage out into an INA (Instrumentation Amplifier) and then into a chip like a uC. The uC analog input gets scaled into engineering units Kilo Grams or whatever. That or as I see you have a solution for a 0 to 10 Volt input.

#### Dodgydave

Joined Jun 22, 2012
10,249