phmeter cable and temparature sensor

[sotisanis sotisanis]

hello please tell me, who is the model for the ph cable and where i
buy this cable?
also i see you use a cable for temparature sensor, where i buy this
cable?

[Carlos Neves]

2012/3/12 sotisanis sotisanis <soti...@gmail.com>

hello please tell me, who is the model for the ph cable and where i
buy this cable?

I use pH glass sensor. There are two kinds: (a) without reference and (b) with reference integrated. There are advantages to use a reference separated when you construct a potentiometric sensor or buy a ion selective electrode. For just measure the hydrogenionic concentration, the glass pH sensor with a reference electrode integrated is the best option.

http://en.wikipedia.org/wiki/PH_glass_electrode

You can order from different sellers on the Internet. You can find expensive and cheap electrodes. I do not know your country. You need make a search.
 

also i see you use a cable for temperature sensor, where i buy this
cable?

I made it using a tree wires cable and solded the sensor. Do not sock the sensor in the water to avoid short circuits. Instead of it, put it outside of the reservoir in touch. The sensor LM35 does not need a calibration.

http://www.ti.com/lit/ds/symlink/lm35.pdf

===

Important tips

Chemical sensors are not robust. So, pay attention to avoid problems with bad results and take wrong conclusion. The pH glass sensor is not a temperature sensor. There are some cares.

Read the FAQ from the pHduino website. There are important points about the stability of the measurement using a glass electrode in a medium with organic debris (fish poop) and algae adsorbing and covering the sensing glass bubble or the porous connection of the reference electrode.

Another point is the calibration. You need make regular calibrations to check if everything is ok.

http://code.google.com/p/phduino/wiki/FAQ

Carlos A. Neves

 

--
You received this message because you are subscribed to the Google
Groups "pHduino" group.
To post to this group, send email to phd...@googlegroups.com
To unsubscribe from this group, send email to
phduino+u...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/phduino?hl=en