Innacurate Scales

[MyQul]

I've just tested my general scales to see if they are still accurate after the 5 years I've had them. They measure 1021g for a litre of water. This 21g, I dont think would have much effect when measuring kilos of base malt but what about smaller amount of specialty malts. I'm too cack a maths to work out if this small amount of error will somehow be magnified when measuring small amounts

 

[Bigcol49]

Hi!
Is there an adjusting knob?

This is not a line from a Carry On film

 

[BeerCat]

The switch for adjusting your knob? Or is it the other way around. Mine are also not perfect like yours but i think its close enough not to care. I don't use them for generally less than 75g and i don't weigh hops on mine.

 

[chrissyr63]

How did you measure a litre of water? That could be just 1% out on each side - seem accurate enough ?

 

[Gerryjo]

Try measuring a few bags of sugar or something of a fixed weight as I would say that you have measured your own litre although I maybe wrong.

Sent from my ALE-L21

 

[Fil]

for small hop measurements buy a jewlers /drug dealers scale for a fiver from a market stall selling rizla's etc..

21 g in a 1000 represents circa 2% error.. (20/1000= 0.02)

 

[MyQul]

Hi!
Is there an adjusting knob?

This is not a line from a Carry On film

OOOh. Matron!

No their doesnt seem to be any sort of way to adjust/calibrate them

 

[MyQul]

How did you measure a litre of water? That could be just 1% out on each side - seem accurate enough ?

I have two measuring jugs a 1L one and a 2L one. They both showed 1L at the 1L marking

 

[MyQul]

Try measuring a few bags of sugar or something of a fixed weight as I would say that you have measured your own litre although I maybe wrong.

Sent from my ALE-L21

The 1L was the fixed weight. I was aware that if I just used 1 jug the markings might not be right but I have two measuring jugs and both showed the same at 1L

 

[MyQul]

for small hop measurements buy a jewlers /drug dealers scale for a fiver from a market stall selling rizla's etc..

21 g in a 1000 represents circa 2% error.. (20/1000= 0.02)

I have jewellers scales for hop measurements. These other scales are just for grain. As I say I was concerned that somehow the 21g error could somehow magnify when measuring small amounts (like 100g - 250g)

Thanks for telling me what the error is. Id never be able to work that out :thumb:

 

[Gerryjo]

Try weighing the jugs dry and fill to the mark on both to see if there is even the slightest difference.

Sent from my ALE-L21

 

[Gerryjo]

I have jewellers scales for hop measurements. These other scales are just for grain. As I say I was concerned that somehow the 21g error could somehow magnify when measuring small amounts (like 100g - 250g)

Thanks for telling me what the error is. Id never be able to work that out :thumb:

Sorry didn't see your post on jewellers scales.

Sent from my ALE-L21

 

[chewie]

If you are using 1 litre of water it must be at 4 degrees C to obtain a true reading, this is when water is at it's densest, hotter or colder then allowances have to be made for expansion.

1 litre of water at 4c = 1kg, this should also give a gravity reading of 1.000.

 

[MyQul]

Try weighing the jugs dry and fill to the mark on both to see if there is even the slightest difference.

Sent from my ALE-L21

DOHHHHHH!!!!! Forgot about the weight of the jugs!!!!

 

[Bigcol49]

Forgot about the weight of the jugs!!!!

Hi!
Another line from a Carry On film :lol:

 

[Bigcol49]

If you are using 1 litre of water it must be at 4 degrees C to obtain a true reading, this is when water is at it's densest, hotter or colder then allowances have to be made for expansion.

1 litre of water at 4c = 1kg, this should also give a gravity reading of 1.000.

Hi!

But is the thermometer calibrated?

 

[Fil]

not forgetting atmospheric pressure and elevation