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Question Small waterbaths

7 years 4 months ago #26233 by TIMSTAR_Tom
At Timstar we're looking at our range of water baths, following some enquiries regarding smaller capacity models.

The most popular sizes are 8L and 14L, so we'd like to know how useful a 2L water bath would be. Are there any circumstances where a 2L water bath would be ideal? If you were considering purchasing such a model, what are the factors would you consider?

Any feedback would be most gratefully received.

- Tom, Timstar

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7 years 4 months ago #26236 by TecHKnow
We have the one from the Clifton range which has served our purposes well over the past ten years. Its a 22 litre version and suits classroom use ideally. Easy thermostatic manual control dial which is fantastic and helps, I suppose keeps the costs down versus a digital equivalent. I do wish, however, that the manual control was locakble. My personal gripe.

As for a lower capacity version. I only see a 2 litre version as an main advantage in prep room situations. It would be ideal, for example to have a water bath that can hold one or two conical flasks and keep them at a constant temperature. I would not have to drag in the larger water bath.

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7 years 4 months ago #26237 by Goonrob
Like Seamus- I SOOOOOOOOOOOOO wish that the settings were lockable. Something like those that some manufacturers have on their power supplies.

As for the 2L size- this size would be great for students working in pairs, using test tubes: as long as you have the racks that would support either test tube, or boiling tube sizes.

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7 years 4 months ago #26241 by Marcus Rowland
There might be uses if the price / controllability were good, e.g. if you could have several in a lab set to a precise temperature - for example, 30 to 70 degrees in 10 degree steps. But at the usual sort of prices for water baths, most departments can only afford a couple per site - e.g. we have two 11L and one 22L per site, and have to adapt experiments accordingly.
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7 years 4 months ago #26247 by Chimbles
Lockable temperature settings? YES PLEASE!

I would find a smaller capacity water bath really useful. A lot of the work we've been doing recently has involved keeping stock solutions at a range of temperatures for use (The recent brewing CAT for instance). We also just need to keep test tube samples at number of different temperatures, it always looks so wasteful having a large waterbath with only one test tube rack in it.

However, having the money to buy them would be another issue entirely :whistle:

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7 years 4 months ago #26263 by slgiles
A small 2L waterbath is ideal in the preproom when you’re doing microbiology, you can reliably get the medium down to 50* before inoculating with your bacteria when making loads of pour plates. If it came with a cover or those beads you can float on top so the higher temperatures could be reached enabling the dissolving of agar so you don’t have to get the auto clave / pressure cooker out, that would be great.
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7 years 4 months ago - 7 years 4 months ago #26280 by Baldilocks
Floating this with a view to being shot down / applauded:

Most of mine are used most of the time for test/boiling tubes only. Comparatively rarely do we do flasks. So:
How about a 'bath' that is built around either a 16 or a 32 boiling tube rack?

A related item that would interest me is an electric boiling beaker - either a heating mantle for a 250 or 400 beaker or a water bath of that size that will boil. I am unhappy about the idea of boiling beakers on a tripod (with thermometer perched in it) and we seem to do this very frequently.

Ian

“Do not believe everything you read on the Internet.” -Abraham Lincoln
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7 years 4 months ago #26295 by Sue
Something I'd find useful, as well as a lockable dial, is one where the numbers on the dial actually correspond to a particular temperature. Our Clifton ones are rubbish for this - every one is different!

Small water baths would certainly be useful in some situations.

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7 years 4 months ago - 7 years 4 months ago #26299 by bsimmo
Grant JB1 and JB2 Unstired are perfect in size and use.

Both for media, media prep and test tube/boiling tube and fermentaion in pop bottles etc..

We don't need anything else here.

I think they are 3.5L and 10L getting quite old now. Still look modern, work, easy to clean.
Power on/off switch, and temperature dial

They are older than this documant but I cannot see any real changes
www.grantinstruments.com/media/75188/jb_...ing_instructions.pdf


I do not see why anyone would need or that we would need anything fancier.

The only thing I would alter would be to add a removable lead (like a kettle lead attachment) to make storage that bit easier for us. (the wire out the side takes up that little bit to much room and the cables get put into the wet innards)
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7 years 4 months ago #26311 by Marcus Rowland

Sue wrote: Something I'd find useful, as well as a lockable dial, is one where the numbers on the dial actually correspond to a particular temperature. Our Clifton ones are rubbish for this - every one is different!

Small water baths would certainly be useful in some situations.


Yes, forgot to say that - we have the same problem with the Clifton baths. We have to put them on well in advance and get them stable at the right temperature. That might be where the electronically controlled baths score.

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7 years 4 months ago #26313 by DampSquib
I couldn't see my school considering investing in these as we would need 15+ for pairs to use. If individuals or pairs of pupils need their own waterbaths they tend to use Bunsens/ kettles/ ice etc. In some assessed pracs (AS/A2 OCR this year even) the students get extra marks for keeping temperatures even & not using a thermostatic water bath.

The lockable temperature dial baths would be very welcome though! (Echo, echo!)
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7 years 4 months ago #26316 by Annie
I think that size might be handy for microbiol stuff in the prep room. For the classroom I'm with the others about lockable temp control. However the major consideration would be cost.
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7 years 4 months ago #26319 by tom foxe
A simple electro-mechanical thermostatic switch needs a temp. change to operate it, so water temp. cycles above and below target temp. How much more does accurate temp. regulation cost, and how much is it needed ? As I don't use electric waterbaths I don't know what the usual requirement is.
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7 years 4 months ago #26326 by bsimmo

tom foxe wrote: A simple electro-mechanical thermostatic switch needs a temp. change to operate it, so water temp. cycles above and below target temp. How much more does accurate temp. regulation cost, and how much is it needed ? As I don't use electric waterbaths I don't know what the usual requirement is.


They need to be stirred baths for a start for very high accuracy
But you can get better unstirrer if you pay more. Still cannot see the need for it in a Science department. Most decent open baths can keep 37C quite easily, for example.

In the end it's not down to if they make them or not since they do, it down to do you want to pay for it ?
www.grantinstruments.com/products/

Timstar_Tom may know the Grant baths as PH rebranded them for resale.


If temperature are off, then either just clean/descale the bath and recreate a scale or mark the common points on each one. Consider moving the knob to the correct position as well.

Stick hot water cold/hot mic in it (ours comes out of the tap a 60C) to speed up heating

In our JB1, we can fit 2x 1L Flasks in it iirc.
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6 years 7 months ago #30607 by bsimmo
We're looking to buy up to 4 bath soon to replace our again Grant JB1, the plastic tub is now fracturing and cracking off.
We'd like the same size, ability to fit 1L flask, preferably 2 of them and also 1cm wider to give better circulation.

Anyway this topic is still a sticky so thought I'd see if anyone has tried the newer ones ?

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3 years 4 months ago #39782 by Cookerty
There are also 'triple' water baths appearing in the catalogues that I'm very interested in for enzyme temperature practicals. However they cost over £600. My argument is that I'd only have to move one water bath around the dept. I'm hopeful......

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3 years 4 months ago #39797 by AndyG
It may be worth contacting the manufacturer. Our baths are very old, the plastic has gone brittle around the edges and been broken but we were supplied with replacement liners for about £30 each. If you have the technical ability to swap them it's a really cheap fix.

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3 years 4 months ago #39803 by bsimmo
Andy, which manufacturer and baths ?

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3 years 4 months ago #39806 by AndyG
<runs off to check ...>
They are Grant ones!

Our old P.H. branded ones are Grant as well.

The only issue I had was the position of the element entry - ours were old so had the hole in a different place. I ended up with undrilled tanks and put the holes in to match the original myself.

One thing I did notice was the stress fracturing concentrated around the fixing rivets/screws so I used a silicon adhesive to stick the tank to the body instead with a couple of very soft aluminium rivets to ensure it was mechanically secured.

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