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kiyoshi_abe
Newbie
Joined: 13 Sep 2007
Posts: 1
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 Posted: Wed Sep 17, 2008 2:04 pm Post subject: DrDAQ indicate wrong pH |
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Hello,
I use DrDAQ for pH measurements and the readings are not correct with the picolog recorder, where the reading is stuck in a value around 7 in all cases. Moreover, readings shows 7.56 in 0.1mol/L HCl solution, and 6.74 is shown in 0.1mol/L NaOH solution.
This situation is quite the same also in Parallel Port and USB Parallel Port
Adapter.
I use picolog recorder rerease R5.20.1 and Windows Vista Home Premium SP1.
Could you please offer a solution?
Thank you |
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picojohn
Site Admin
Joined: 11 Jun 2007
Posts: 391
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| Posted: Thu Sep 18, 2008 3:10 pm Post subject: |
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Hello kiyoshi_abe,
It is possible that your pH probe is defective as they can dry out over time and, the easiest check would be to use a known working probe in a buffer solution of known pH.
Regards
John |
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Guest
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| Posted: Fri Sep 19, 2008 10:59 am Post subject: DrDAQ indicate wrong pH |
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Thank you.
Each solutions of 0.1mol/L HCl(Factor 0.999) and 0.1mol/L NaOH(Factor 1.002) are both volumetric analysis solution. I am using these solutions for the neutralizing titration.When I measured them by other pH meter, they indicate 1.01 and 13.01 respectively.
DrDAQ displays a wrong pH though the pH probe of this pH meter is substituted for DrDAQ's one.
It seems that this pH probe is not out of order.
When I use picolog recorder release R5.08.6 and Windows Vista Home Premium SP1, DrDAQ indicate 1.10 in 0.1mol/L HCl solution and 12.30 in 0.1mol/L NaOH solution.
However, picopp.sys and DRDAQ32.DLL were substituted as follows.
picopp.sys 2002/07/31 => 2007/07/02 (R5.20.1)
DRDAQ32.DLL 2002/07/31 => 2008/05/02 (R5.20.1)
Best Regards. |
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ziko
Site Admin
Joined: 01 Dec 2006
Posts: 711
Location: St Neots
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| Posted: Mon Oct 27, 2008 11:33 am Post subject: |
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Hi sorry for the delayed response, John does not work with us anymore.
There may be a problem your DrDaq. Please email us at support@picotech.com so we can look into this further.
Kind regards. |
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ziko
Site Admin
Joined: 01 Dec 2006
Posts: 711
Location: St Neots
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| Posted: Mon Oct 27, 2008 11:44 am Post subject: |
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Actually one other thing you can try before sending us an email is to short out the BNC connector using a terminator plug (or paper clip). The reading on the screen should be pH 7 (0.5).
Kind regards |
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