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.
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.
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.
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).