Liquid in needle

[Exchaner]

Hello you guys, just like another poster mentioned, the liquid in the needle does NOT count towards the total volume. So If you actually use the liquid in the needle in addition to the amount in the syringe, aren't you going over your intended amount? I usually empty whatever is in the syringe and discard what is left in the needle. Sometimes I try to salvage it by blowing it back into source bottle.

 

[tonyorion]

In good technique, you would not normally count the volume in the syringe as one poster already mentioned.

That, however, requires voiding any air beneath the plunger which can get messy and dangerous if using high nic base. Medicines are dispensed from bottles with rubber caps for a reason. You have seen the trick: invert the bottle, draw liquid, tap syringe to remove bubbles, squirt back into bottle until you don't see an air gap. It's also not a good idea not to inject air into a vein.

It's also the reason chem labs do not use syringes for transferring fluids unless it's to inject something into an instrument like a chromatograph.

Dosing units like pipettors use differential measurement to transfer liquids: you fill a chamber with a known volume and then void that volume. The tip with any residual liquid gets tossed. The long glass pipettes can be very accurate as well, but are a pain to use and clean.

Those throw away PP pipettes sold by most stores offering flavors are not meant to be completely voided: you only count what is voided between the markings. Talk about a rip off! You can buy a package of a 100 for the same price as a package of 5 from an ecig retailer.

At the end of the day, the amount of liquid in the needle really does not make much of a difference UNLESS you are mixing really small quantities and using really large gage needles. Look up the charts and do the calculation. You will sleep better at night.

As far as your juice recipes are concerned, as long as you make the same mistake, you will come up with the same result. There is a huge difference between precision and accuracy. But I really do not want to open up that bag of worms.

 

[03FXDWG]

I will have to practice my inversion technique. I had quit using the needle on VG because it's easier to remove the plunger & pour it in the syringe than suction it out of the bottle. I use prepackaged insulin syringes that have the needle included for the flavorings & that is why I thought the measurement was included but it makes sense that the larger gauge needles would hold differing amounts making it impossible to account for that volume on the syringe measurements. .10 milliliter of PG isn't going to affect my batches enough to matter but if my flavoring is off by that much on a 5ml batch, I can definitely see a problem when I try to double it; especially on the more potent flavors. Hmm...I will definitely be changing my mixing procedures.

 

[Just Me]

I will have to practice my inversion technique. I had quit using the needle on VG because it's easier to remove the plunger & pour it in the syringe than suction it out of the bottle. I use prepackaged insulin syringes that have the needle included for the flavorings & that is why I thought the measurement was included but it makes sense that the larger gauge needles would hold differing amounts making it impossible to account for that volume on the syringe measurements. .10 milliliter of PG isn't going to affect my batches enough to matter but if my flavoring is off by that much on a 5ml batch, I can definitely see a problem when I try to double it; especially on the more potent flavors. Hmm...I will definitely be changing my mixing procedures.

Yes, it definitely makes a difference when you double it (or triple it, or more).

I made one juice in 10ml batches that I liked a lot. I would draw up the ingredients into syringes (with needles) and dispense them into the bottles individually. I decided one day it would be a lot easier to combine the flavor ingredients together in a larger batch so I would only have to measure one flavor (at 25%) instead of each flavor at its own percentage. The amounts remaining in the needles always bugged me, though. I found a website that has instructions and pictures on exactly how to measure with a syringe. If I had thought about it, what Hoosier said about the liquid staying in the needle unless the plunger is removed, I wouldn't have worried about it so much. However, I know I was intentionally adding that to the liquid anyway, so I was defeating the purpose of the vacuum. Now I'm rambling...

Back to the point, in between my making 10ml finished juice and learning the correct way to measure with a syringe, I made up the flavor combo the "correct" way. Then I made a 120ml batch of finished juice with my 25% flavoring, and it wasn't as strong. So I know I was adding extra flavoring from those syringes. The finished result would add up (or in this case diminish) going from a 10ml batch to a 120ml batch without those extra drops (12 times!)

So now I know how to measure, but I have to redo my recipe to compensate for my ignorance. Here is the site that explains it, and after I draw it up, I remove the needle from the syringe before dispensing it. I hope I'm making sense...

Murphy's Machines - How To Use A Syringe