Pipette dose any one else use them?

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squid509

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im not talking about the disposable ones im meen like this one


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Archer74

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Thats a laboratory micro pippette. It can measure tiny amounts of liquid as in microLiters. I've used them before pretty nice to have but it cost $100 at least.

hmmm, I think you can make your own. not as accurate but good enough for eLquid mixing.
I'm thinking a 1ml syringe, a spring, and a metal/glass cylinder. coz the basic one is just a plunger that extends a metal cylinder with a measured volume displacement.
 
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wrecktangle

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Wow! The plastic pipettes are a great price. Best I've seen. 3ml and 5ml for $17.95/500. These things are great for transferring and mixing liquids. I'll have to check to see what shipping costs are.

Thanks for the link.

ok, not such a good deal at $11 shipping. works out to $0.17 a piece. But you can use them multiple times.
 
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Scottes

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For anyone familiar with these... I could use some help with common operations of these things.


Do you need to buy certain wheel pumps to fit certain Mohr tips, or are they all interchangeable?

Can I buy a 2ml pump and put it on a 10ml tip? If I do this, will I only be able to suck up 2ml of liquid?

What if I put a 10ml pump on a 2ml tip? Do I lose accuracy? That is, can I stuck suck up 1.1ml or liquid?

It seems like it would be a good idea to have a pump+tip for each ingredient - that could get expensive quickly. How easily & quickly can you rinse out a tip attached to a wheel pump? That is, if I measure a flavoring and then go to measure out some PG then some nic-juice, how easily can I rinse the tip between ingredients?


Any usage tips appreciated.
 

squid509

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Hey Squid, where do you get those mechanical pippettes..... Thank you in advance for your reply.......

e-bay i payed $97 for the pipette and a one galon siplock bag of tips from them. read real cairful on which model you get since some are fixed volume and the varible volume have many defrent ranges.

i got the 1ml-0.02ml model since i only mix 2-4 ml of juice at a time
 

SevTE

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Do you need to buy certain wheel pumps to fit certain Mohr tips, or are they all interchangeable?

Normally they are interchangeable. Although it is a good idea to ask the company you order from about any compatibility issues.

Scottes said:
Can I buy a 2ml pump and put it on a 10ml tip? If I do this, will I only be able to suck up 2ml of liquid?

Yes; the pump is only capable of displacing slightly over its rated volume.

Scottes said:
What if I put a 10ml pump on a 2ml tip? Do I lose accuracy? That is, can I stuck suck up 1.1ml or liquid?

Accuracy is dependent on the pipette not the method used to fill it.

Scottes said:
It seems like it would be a good idea to have a pump+tip for each ingredient - that could get expensive quickly.

a separate pipette for flavor, e-liquid and PG/VG is good idea. You do not need a separate pump or bulb however (no liquid should be entering the housing or mechanism of the pump/bulb).

Scottes said:
How easily & quickly can you rinse out a tip attached to a wheel pump? That is, if I measure a flavoring and then go to measure out some PG then some nic-juice, how easily can I rinse the tip between ingredients?


  • Prepare a solution of soapy water in a beaker.
  • Draw the solution into the pipette and wet the walls.
  • Do not get the mouth (part inserted into pump/bulb) of the pipette wet. Drain the soap water solution.
  • Put distilled water into another beaker.
  • Draw the distilled water into the pipette and rinse out the soapy water.
  • Rinse several times to remove all soap residue.

Scottes said:
Any usage tips appreciated.

This is the procedure I use when pipetting with a wheel pump:

  • Insert the mouth end of the pipette into the end of the pipette pump.
  • Be sure to use a pump that can draw the quantity of liquid you want (e.g. 10 ml pump with a 5 ml or 10 ml pipette).
  • Using the wheel at the top of the pump, raise the top of the pump approximately 1cm before inserting the pipette into the liquid. This is necessary in order to create additional air pressure in the pipette when you dispense the liquid.
  • Place the tip of the pipette into the liquid you wish to measure.
  • Hold the pipette pump with one hand with your thumb on the wheel.
  • Using your thumb rotate the wheel downward. This will cause the liquid to rise into the pipette.
  • Watch the meniscus of the liquid rise to your desired level. Remember: Measure the level of the liquid at the bottom of the meniscus (curve in the surface of the liquid).
  • Take the tip of the pipette out of the liquid and place it in the container you want to dispense the liquid into.
  • Using your thumb rotate the wheel upward. This will cause the liquid to be dispensed from the pipette.
  • Lower the top of the pump all the way to the pump shaft. The extra space created before pipetting, will allow the entire content of the pipette to be dispensed.
 

SevTE

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Accuracy is dependent on the pipette not the method used to fill it.
Can't edit yet so I'll add my correction here.

The accuracy of the fluid measurement is dependent on the pipette not the method used to fill it. However if the pump used to fill the pipette were only capable of drawing fluid in incremental steps that would be a limiting factor.
 

Scottes

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Many, many thanks SevTE. That's great info.

Just to make sure I'm thinking correctly...

When mixing a batch of DIY e-juice, flavorings are added in small amounts, so it's important to be accurate when measuring them. So it seems to make sense to have several small pipettes (a mix of 1ml and 2ml) and 1 small wheel pump (2ml) to fit. After measuring a flavor, put a clean pipette on the pump and measure then next flavor.

Other ingredients like PG and nic-juice are added in larger amounts, so we need larger pipettes (a mix of 5ml and 10ml) and 1 larger wheel pump (10ml). Again, replace the pipettes after each ingredient.

When done, wash all the pipettes at once, like in the dishwasher or something.


Please correct me where I'm wrong.
 

squid509

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if your going to get those glass pipette dont put them in the dishwaser they will brake

i chose the pipette moldel i got becuse i can change the volume it draws up for pricice mixing of all ingrends. i dont need mutaple pipettes if i only make 2-4 ml batches wich is enoght to fill a droper bottle that last me 2-3 days
 

Scottes

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if your going to get those glass pipette dont put them in the dishwaser they will brake
From pelletlab - pipettes

"Mohr PipetteTips...are manufactured from specially selected heavy-wall machine-drawn borosilicate glass tubing."

That's basically Pyrex, right? I wouldn't think that would break in a dishwasher - as long as they're placed so they don't bounce around. Yes/no?
 
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them0nk

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Can't edit yet so I'll add my correction here.

The accuracy of the fluid measurement is dependent on the pipette not the method used to fill it. However if the pump used to fill the pipette were only capable of drawing fluid in incremental steps that would be a limiting factor.


i'm wondering the same thing... i would Think that the 10ml pump would fill it faster but i'm not sure...

this is a really important question though... wouldn't want to throw that 10ml pump on a 1ml pipette and Instantly overfill it accident. lol.
 

Scottes

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i'm wondering the same thing... i would Think that the 10ml pump would fill it faster but i'm not sure...

this is a really important question though... wouldn't want to throw that 10ml pump on a 1ml pipette and Instantly overfill it accident. lol.
I think I'm going to suck it up and order $50 worth. A half-dozen pipettes and 2 pumps from PelletLabs... 1ml and 2ml pipettes and a 2ml wheel pump, and 5ml and 10ml pipettes with a 10ml wheel pump. I probably don't need all that, but it seems correct and convenient...
 

Scottes

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you all so need to clean the inside wich the dishwasher wont do
to clean the inside you need to suck and blow out the pipettes with sopey water a bunch or times if your doing that maght as well hand wash the outside and be done with it
Yep, OK, makes sense. Thanks.
 
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