GMG Gasmate Scales

Submitted: Wednesday, Sep 30, 2015 at 09:18
ThreadID: 130461 Views:1760 Replies:4 FollowUps:4
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Can anyone assist?

Yesterday i received a GMC Gasmate Gauge.
I have been trying to follow the instructions and seem to be having a few issues and have a couple of questions:

My 9 kilo gas cylinder (as printed on the cylinder) has stamped a TW of 5.08KG & capacity of 9.6 litres = 14.68

I have weighed the bottle with the GMG, 10 times and readings are:

10kg, 10.75, 11, 10.5, 10.5, 10.5, 10, 11, 11 & 11.75, say 10.5, a difference of 4.2
(My bottle was filled yesterday at BCF).


Also if i move the "empty" marker to the TW (5.08, as per instructions) when i weigh the cylinder the tabs on the marker, stop the scales from working. To weigh the bottle, you have to slide the "empty" ring back to a position above 0 klg, or above the red marker tab..

Obviously i am doing something wrong, or have misinterpreted the instructions? Any assistance would be appreciated
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Reply By: TomH - Wednesday, Sep 30, 2015 at 10:12

Wednesday, Sep 30, 2015 at 10:12
Did they fill it by weight or until it vented. Makes quite a bit of difference
AnswerID: 590887

Follow Up By: TomH - Wednesday, Sep 30, 2015 at 10:18

Wednesday, Sep 30, 2015 at 10:18
Reading the instructions it seems pretty easy

Why not do the last bit and just use it as a scale will give you total weight and next time its empty do the Tare
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FollowupID: 858979

Follow Up By: Member - Timboc - Wednesday, Sep 30, 2015 at 10:41

Wednesday, Sep 30, 2015 at 10:41
Yeah good point. I don't know as they disappear out the back. But from past experience around the country they just let it vent for 30 seconds when full.
Re your suggestion, that is what i will do, it just annoys me when stuff doesn't do what is claimed.
Cheers
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FollowupID: 858980

Follow Up By: TomH - Wednesday, Sep 30, 2015 at 12:46

Wednesday, Sep 30, 2015 at 12:46
How much did they charge you for it 9kg off them is over $22 last time I got one there.
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FollowupID: 858987

Reply By: Dennis Ellery - Wednesday, Sep 30, 2015 at 10:43

Wednesday, Sep 30, 2015 at 10:43
I think you have a 4kg gas cylinder.
9kg gas cylinders weigh about 9kg empty and 18kg full.
As for a simple spring gauge – it could have a variation of 10% or more.
I think the stamp WC is water capacity in litres (not gas capacity)
AnswerID: 590889

Follow Up By: Member - Timboc - Wednesday, Sep 30, 2015 at 10:49

Wednesday, Sep 30, 2015 at 10:49
Ahaa, that's where i went wrong! Thx
I think i will now go and hide in a corner and recalculate.
Cheers Tim
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FollowupID: 858983

Reply By: Gronk - Wednesday, Sep 30, 2015 at 12:53

Wednesday, Sep 30, 2015 at 12:53
Uumm, why do you want to weigh the bottle ? Do you want to know when it's getting empty ? If so, looks like those scales are fairly inaccurate. A cheap set of digital luggage scales might be better !

AnswerID: 590895

Reply By: Bill D6 - Monday, Oct 05, 2015 at 18:17

Monday, Oct 05, 2015 at 18:17
The specific gravity (SG) of LPG is 0.51 kg/L. That means 1L weighs 0.51kg. So your bottle with a 9.6L capacity should hold 9.6 x 0.51 = 5.08kg of LPG. If you add on the tare weight of 5.08kg then the weight full should be around 10.16kg.

Bit of a coincidence that the tare weight equals the capacity. So your weights are in the ballpark given the error in these sorts of scales
AnswerID: 591222

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