Do you know what kind of sensor you have? Graphite? Stainless steel?Sorry to dredge this thread back up, but I was hoping @Randy Holmes-Farley or someone in the thread could answer...can you sanitize these probes with bleach without damaging them? If not, what can you use? I also need to ensure there is no cross contamination of copper. I mistakenly stuck the probe directly into my QT today instead of pulling a sample. I don't know if the fish in QT have disease, but I certainly don't want it in my display, nor the copper! Any help is appreciated!
That sounds right. I wouldn't expose it to bleach very long as that material may oxidize. I might try a different way, like soaking in vodka.The probe is Orion model 011050. Assuming the manual I found online is correct and it wasn't changed while keeping the model number, it is epoxy/graphite.
How do you like your pinpoint salinity monitor.I've had a Milwaukee meter for a couple of years and was never able to get accurate results, even with the Pinpoint standard and calibrating it correctly. It was usually off by couple points, since the accuracy is +/- 0.002 (e.g. 1.026 would read 1,024 or 1,028). I finally quit using it, since I couldn't trust it and now only use my Pinpoint Salinity Monitor and a refractometer.
Hope this helps
I actually have quit using my Pinpoint Salinity Monitor, since I just couldn't trust it to give me a consistent and accurate reading. I've had, and used, my Pinpoint Salinity Monitor for over 4 years and experienced a number of issues. Here are a few:How do you like your pinpoint salinity monitor.
I plan on getting one and getting a proper probe.
Thanks Tim for this detailed response!I actually have quit using my Pinpoint Salinity Monitor, since I just couldn't trust it to give me a consistent and accurate reading. I've had, and used, my Pinpoint Salinity Monitor for over 4 years and experienced a number of issues. Here are a few:
• Very sensitive to electric fields, so I couldn't use it in the sump or tank. I had to take a sample out and measure it on the table. This also required waiting about 4 minutes for the reading to somewhat stabilize.
• I never felt the temperature compensation really worked right. When I measured the sample on the table, it would start off as one reading, then continually change as the sample transitioned to room temperature. So, I found I didn't know when to stop and take down the reading.
• Has to be carefully calibrated with the right standard fluid ... Hint - It's not the Pinpoint standard. I found the AccuraSea standard to be the most accurate.
• The reading varied on battery strength. As the battery got low, the readings would change.
Here's a thread I started in February about "Why do my Salinity measurements vary by 0.002 sg between refractometer and conductivity testers?", which describes my quest to find the most accurate and consistent salinity device.
Overall, my conclusion was:
1. Use an accurate standard, which turned out to be AcuraSea, to calibrate to.
2. I found that 2 devices gave the most accurate and consistent results. VeeGee STX-3 refractomer was the best analog device and the Hanna Salinity Tester - HI 98319 to be the best digital one.
With regard to a "full-time" probe, I can't recommend anything. I've heard the Neptune probe is ok, if you have a Neptune. Although, I would only use it to capture salinity changes, not to give a accurate readings.
I hope this helps make you decision.
Sure. 4 electrodes are better than 2. The orion is an excellent choice.I've instead just bought an Orion 122 with the Orion 012210 conductivity probe. I found out that it is temperature compensated and reads 10uS/cm to 2000mS/cm with a cell constant at 0.609 (cm-1)
I found that it is the DuraProbe 4 cell electrode. Not sure what that means.
Can anyone tell me more about what differences there are with a 4 cell vs 2 cell other than the quantity of cells.
Randy, thanks for your detailed response as usual. Also appreciate that your response has reaffirmed my confidence in my purchase.Sure. 4 electrodes are better than 2. The orion is an excellent choice.
Using Conductivity to Measure Salinity
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In practice, commercial conductivity probes have either two or four electrodes, with the four-electrode version being more resistant to fouling and other effects that can cause degradation of the measurement. The electrodes are made of nonreactive materials such as epoxy/graphite, glass/platinum or stainless steel. The choice depends primarily on the nature of the solution to be tested. For occasional use in seawater, all of these are acceptable.
A four-electrode conductivity cell has many advantages, such as reduced error arising from polarization, contamination of the electrode surfaces, or cable resistance. However, a two-electrode cell is better for pure-water applications where very low conductivities are measured
There are many Orion models so I cannot answer for all of them, but mine could not. I used it for many years and it always read a tad below a standard (never changed).Randy, thanks for your detailed response as usual. Also appreciate that your response has reaffirmed my confidence in my purchase.
Tim thanks again. I've bought the accurasea standard. I hope to properly calibrate my refractometer and ensure that the Orion probe is working properly with the standard.
Ive read previously that the Orion meters do not have a calibrate option. Is this true?
For me, the key advantages were :From what I've read, the Orion's are excellent meters. I look forward to hearing how you like it, and what are it's key advantages.