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PH checker

DaveWatkin

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26 Oct 2020
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Aberdeen, UK
This might be a really stupid question...

I recently bought a Hanna PH checker and I am aiming to get a PH profile over the next couple of days .

Is it ok to keep the probe emersed for this time? If removed and place in storage solution it then takes a good few minutes to stabilise a reading when used again. Would rather leave it in the tank and just switch on each hour to grab an instant reading.

I don't see any issue for a short term use like this but thought I would check with those of experience :)

Checker is this type: HI-98100 Checker Plus pH Tester
 

DaveWatkin

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Aberdeen, UK
Oh, have removed now. I assumed a short period would be fine.

Are the PH probes used on PH controlled CO2 systems a different type? Keep meaning to look into those but never got round to it yet.
 

GHNelson

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Hi Dave
Those pH Controller probes are designed to be used for a specific period of time then cleaned and re-calibrated.
I'm not sure if the membrane material is any different from generic pH probes....maybe someone with inside knowledge will let us know;)
 

dw1305

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Davey

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26 Feb 2021
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Hi Dave

Im my experience alot of pH probes require regular calibration, when I mean regular, I mean just before making a measurement. Sometimes this consists of creating a calibration solution using a tablet and a very specific volume of water. It really depends on the probe though.
We rinse/wash ours with distilled water.
 

dw1305

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Hi all,
Im my experience alot of pH probes require regular calibration, when I mean regular, I mean just before making a measurement.
They need calibration before every use, they also need to be turned on for a couple of minutes before you take the the reading.
Sometimes this consists of creating a calibration solution using a tablet and a very specific volume of water.
Yes, assuming it is a meter with <"two point calibration"> you need pH7 and pH10 and/or pH4 buffers.

<"You can reuse the buffers"> several times, they aren't like conductivity standard solutions, they are <"buffered" against pH change">.

I make up the <"conductivity standards"> for the lab, but we buy in the pH buffer reference solutions, they are time consuming to make, and the bought ones are <"nicely colour coded for student use">.

cheers Darrel
 

Davey

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26 Feb 2021
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Uk
Hi Darrel,

Thanks for your message! Great links! I'll be reading up! Can you point me to more chemistry links within the hobby; solid articles/threads on buffering or kH within the aquarium?

Cheers
Dav
 

dw1305

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Hi all,
Can you point me to more chemistry links within the hobby; solid articles/threads on buffering or kH within the aquarium?
I think generally there is a <"shortage of properly referenced articles within the hobby">. In the case of the measurement of hardness your best bet is probably still <"the Krib article by Larry Frank">.

UKAPS has a few threads linked into articles <"about nitrification">, about the <"phytoremediation of waste water"> and how it relates to the <"Duckweed Index"> etc. We have some more <"about water testing"> and <"analytical equipment">. There are plenty more, many of them not within <"my area of knowledge">.

We also have some articles, covering topics like the <"Soil substrate or dirted tank">, <"A brief and incomplete history of aquascaping"> (both by @Tim Harrison ) and <"CO2 measurement using a drop checker">.

cheers Darrel
 
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