PH meters

[Mother]

Hi all
Can anyone out there in lab. land recommend a reliable PH meter!! I have 2 hand- held meters but they are useless. I need fairly accurate readings for Yr. 12 in particular.
Thanks
Mother

[Robb]

Hi mother,

I can tell you that any reputable brand of pH meters will be suffice.

The bench type pH meters can be quite expensive but this will come down to what you need.

I can't list the brands here at the moment, but you will only find the good quality pH probes through good chemical equipment suppliers.

Hope this helps.

Cheers,

Robb

[JudyM]

Hi Mother,

Did you calibrate the meters before you took any readings?

I use buffers of pH 4,7 & 10 & they need to be calibrated before for each class uses them. We also have electrode storage solution for when they're not in use.

The only other thing I can think of is that the batteries may need replacing.

Good luck
Judy

[Ocker]

To calibrate probes you should have two adjustment screws 1 marked Zero and one marked Span
Set in 7 buffer adjust zero to read 7
set in 10 buffer adjust span till read ing 10
then keep repeating this process till both right because zero will move slightly when you adjust span but you will get the feel for it.
Idid not replace my meters as they broke and have standardised on probes connected to dataloggers these have an electronic interface that you just put in buffers let settle then press mouse button and the magic box makes all corrections. caution each interface box has to remain with a particular probe
Cheers

[Mother]

Thanks everyone for your input and yes, I did calibrate the meters I have.Maybe the pocket size meters are just not up to it.
Take care
Mother

[Di]

JudyM,

Would you be able to tell me what the electode storage solution is made up of. We don't store our PH meters in anything when we are finished with them - does this prolong the life of the sensor head?

Much appreciated.

[JudyM]

Hi Di,

I've sent you a personal message.

Judy

[Timtam]

Hi All
I was searching for the storage solution for PH meters, was wondering if someone could help thank you

[Sassi]

I think pH meters should be stored in 2M KCl, its particularly important that pH probes dont dry out or they will cease to work properly!

[JudyM]

Tammy,
I'm pretty sure I bought my solutions from Haines Educational.

They are manufactured by Hanna Instruments Pty Ltd.
18 Fiveways Boulevarde
Keysborough Vic 3173
Ph 03 9769 0666
Fax 03 9769 0699
http://www.<URL removed, see forum rules>

Electrode cleaning soln - HI 7061
Electrode storage soln - HI 70300

Sorry I don't have prices.
Hope this helps

[Ocker]

pH probes have limited life (2 to 3 years normal)
Doyou have any data loggers this is the best when probes refuse to be calibrated at the end of their life just replace probe you still have interface and datalogger

[slatty]

hi

I purchased mine from Haines. They are baic but work the best.

The order number is MW101 pH meters

Hope this helps

Me

[Mother]

Thanks all for your input with the PH meters. I ended up buying 2 Eutech which are waterproof and also measure temperature. $170 each,so I hope they are worth the money!!!
Cheers
Mother

[Ian]

Thanks all for your input with the PH meters. I ended up buying 2 Eutech which are waterproof and also measure temperature. $170 each,so I hope they are worth the money!!!
Cheers
Mother

Let us know how they go, Mother.

Ian