SE 554 ORP Sensor Calibration with Portable Meter скачать в хорошем качестве

SE 554 ORP Sensor Calibration with Portable Meter

Hello, this is a video on how to calibrate a Memosens ORP electrode, and we'll be using a 907 Multi portable analyzer for the calibration. The electrode that we're going to use is actually an SE 554 AMSN combination electrode, which is pH and ORP. It is a Memosens. And as you can see here we have the cable plugged into the top, and we have the other end of the cable right here which connects onto the electrode - the SE 554 combination. When you make that connection you get a serial number, you get the last calibration, manufacturer, all that good information. So, I'm going to remove the wetting cap that's on there, and because this is a combo probe it does ORP and pH at the same time. I'm going to put it into the calibration solution. Now anytime you do a calibration on this type of electrode, a couple of things you want to keep in mind - one, you want to make sure they're clean. Any debris, any kind of mineral deposits, anything that could coat the glass portion or the ORP portion or plugging the junction will affect the calibration the quality of the calibration. You want to start off with a clean electrode and we have other videos that you can watch on how to prepare and clean an electrode for calibration. As I said, this is a combo probe, so you'll notice this is pH that it's reading, but if I hit Measure I can see the mV value or ORP value coming out of the ORP portion. So we'll go ahead and do a calibration on both sides of it, but the ORP is what we're primarily after. Now, whenever you calibrate an ORP, you want to use a known standard so that you can get a proper calibration - in this case we're using a 220 mV ORP standard at 25 °C. If you come to 25 °C, skip through this column just for a moment, come across to 220 mV at a pH of 7. And that's for Ag/AgCl reference systems which is exactly what we have here. This other column I mentioned right here is for a different type of reference system that we do not have within the Knick product line. So, good standard to use, 220 mV at 25 °C. Now to do the calibration - and by the way if I didn't mention it, this is also a buffer 7, as well as a 220 mV standard. So we can also do the calibration - or check it at least - because it is a buffer 7. Let's go ahead and hit Menu; Calibration. Now here, we select how do we want to calibrate, so right now we're going to do ORP, so I hit Enter; I hit Start. So now, I'm going to tell it at 23 °C, actually we're between 20 and 25, so I'm gonna tell it that it is 220 mV which we already have, but if I wanted to change it I could do that. So I hit Enter, my correction value is going to be -18 mV based on the reading; I hit Apply. So we're 220 mV and we have our smiley which is indicating that the calibration is good and there's nothing wrong with the electrode. So now i'm going to hit Menu; Calibration; I'm going to hit Manual; I'm going to do 2 point calibration. Now I'm going to calibrate the pH side, so again 23.1. I'm currently reading 6.97 which is pretty close, I hit Start. If I were in a buffer four at this moment I could come over and change it but of course I'm not - I'm in a buffer seven. I hit Enter; Continue. While that's doing that I'm going to open up the buffer 4 so I can do my second point of calibration. It's telling me go ahead and dip sensor into the second buffer. So here, I'm gonna go ahead and enter a buffer 4, and I'm gonna remove this from the buffer 7. I'm going to wash it - I'm using some DI water to wash off the electrode. I'm going to remove my buffer 7, and go ahead and dip the electrode into a buffer 4, stir just a little bit. Now, right now I'm gonna let it stabilize so I want to make sure that my pH value is stable, and I also want to make sure my temperature is stable. Patience is important here, so you want to make sure that it's not moving in value more than once per second. pH value looks pretty stable, temperature I would say we're also stable. I'm going to go ahead and hit Enter here so it gets me ready to continue. I hit Continue and it's going to start the calibration for the second buffer, which is a buffer 4. So again, we've already calibrated the ORP. Here's the results of my pH two-point manual calibration. I've got a response time of 15 seconds, a slope of 96.9, a 0.7.2 at 13.1 mV, it's showing me my two buffer values 4 and 7, and it's giving me the smiley. So of course if I don't hit apply, that calibration will not be put into the electrode or the adjustment won't take place, so remember you have to hit Apply. There's our pH value - 4. I'm going to go ahead and move it over to the 7. You can see it coming up and we'll take a look at the ORP value which is 219. And what you don't see is that we're in the same ORP solution we started with, which is 220 mV and also a buffer of 7 - 6.96. All right, that's it for this video, I hope this was informative. Thank you, bye.