lubbockfishdude
Member
Does anyone know anything about digital readers for water chemistry stats? I have heard they exist and can electronically read pH, Nitrites, etc. I am curious about realiability, cost and where to get one.
Digital water chemistry monitor
- Thread starter lubbockfishdude
- Start date
2
25gator
Guest
i have the ph +orp . ph works good so far its 90$ and you nead to chang the probe every 1-1.5 yrs ive been told. plus u calibrate it (kinda sucks) all and all i like it. orp weird but ok <img src="graemlins//urrr.gif" border="0" alt="[urrr]" />
marine fanatic
Member
ORP = Oxidation-Reduction Potential
broomer5
Active Member
ORP as mentioned is the acronym for Oxidation Reduction Potential. Some refer to this a REDOX for Reduction Oxidation.
The probe itself puts out a direct millivolt output, same as the pH probes. pH probes take the millivolt signal and through the electronics, convert the reading to pH scale of 0-14. In a pH buffer of 7.0 ( in a perfect world ) most pH probes will output 0.00 millivolts. For every 1 value in pH increase there is a -59 millivolt output from the probe.
So at
8.00 pH = -59 mV
9.00 pH = -118 mV
10.00 pH = -177 mV
11.0 pH = -237 mV
12.00 pH = -296 mV
13.00 pH = -355 mV
14.00 pH = -414 mV
As you go down the scale in pH from neutral 7.00
the values are identical except they are in positive millivolts, each pH step being a +59 mV output from the electrode probe.
pH of 0.00 = +414.00 mV
ORP on the other hand reads the DIRECT millivolt from the ORP probe. Oxidation Reduction Potential is the ability of the ions is solution to either give up (oxidize) or gain (reduce)electrons. Natural seawater has an ORP of somewhere between +250 to +350 mV.
Some folks find an ORP system to be helpful, especially if using ozone, or other auto corrective equipment.
ORP / REDOX potential rises,
it indicates better water quality in general.
If something dies in the tank, you'll see a change in ORP.
As you make adjustments to your water chemestry, you'll see some fluctuations in the ORP as well.
It's an electronic gadget that is not necessary, but you know how reefer's are. If you can measure it - and the measurement is a good indicator of overall water quality - and your wallet can handle the hit - then many will fork out the cash to get all the cool toys.
I can get my hands on one from work - but so far I don't see the need. Waiting on a discontinued demo unit to become available - then I may tinker around with ORP. Until then - not too concerned about this measurement.
Maybe some other folks on here that use ORP will share what they know - My interpretation of this is somewhat limited to actual marine tank applications.
In other words - I know HOW they work, but have never put one into actual service on any of my tanks.
The probe itself puts out a direct millivolt output, same as the pH probes. pH probes take the millivolt signal and through the electronics, convert the reading to pH scale of 0-14. In a pH buffer of 7.0 ( in a perfect world ) most pH probes will output 0.00 millivolts. For every 1 value in pH increase there is a -59 millivolt output from the probe.
So at
8.00 pH = -59 mV
9.00 pH = -118 mV
10.00 pH = -177 mV
11.0 pH = -237 mV
12.00 pH = -296 mV
13.00 pH = -355 mV
14.00 pH = -414 mV
As you go down the scale in pH from neutral 7.00
the values are identical except they are in positive millivolts, each pH step being a +59 mV output from the electrode probe.
pH of 0.00 = +414.00 mV
ORP on the other hand reads the DIRECT millivolt from the ORP probe. Oxidation Reduction Potential is the ability of the ions is solution to either give up (oxidize) or gain (reduce)electrons. Natural seawater has an ORP of somewhere between +250 to +350 mV.
Some folks find an ORP system to be helpful, especially if using ozone, or other auto corrective equipment.
ORP / REDOX potential rises,
it indicates better water quality in general.
If something dies in the tank, you'll see a change in ORP.
As you make adjustments to your water chemestry, you'll see some fluctuations in the ORP as well.
It's an electronic gadget that is not necessary, but you know how reefer's are. If you can measure it - and the measurement is a good indicator of overall water quality - and your wallet can handle the hit - then many will fork out the cash to get all the cool toys.
I can get my hands on one from work - but so far I don't see the need. Waiting on a discontinued demo unit to become available - then I may tinker around with ORP. Until then - not too concerned about this measurement.
Maybe some other folks on here that use ORP will share what they know - My interpretation of this is somewhat limited to actual marine tank applications.
In other words - I know HOW they work, but have never put one into actual service on any of my tanks.
