Has anyone used the ANTEK7090 sulfur chemistry SCD detector?
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The unit has acquired an AC7890B chromatograph, equipped with an ANTEK 7090 type SCD detector. I encountered many problems during use. When I consulted an engineer, he was also confused. After searching for information, I found very little material on this topic. When I visited the official website, there wasn’t even an official after-sales service phone number – it’s really frustrating! That million-dollar instrument is really starting to fail! Are there any seniors who have used the same equipment? Please give me some advice! 1. What is the upper limit for the detection of sulfides in method ASTM D5504? Why can our unit only detect around 100 ppm? 2. Should the PMT voltage of ANTEK have a certain stable range? The fluctuations in our unit are quite large, which directly affects the reproducibility of the test results. At the moment, these two issues are quite urgent. Is there any expert in this field who could give some advice? I’d be extremely grateful! :handshake
This post was last edited by qugd on 2015-7-7 22:00. SCD is a sulfur chemiluminescence detector; it is a detector designed specifically for the analysis of sulfur, with a high sensitivity to low-valent sulfur. However, its response is not very stable regarding sulfate and higher-valent sulfides. A high-temperature reaction is required to transform the sulfur form, and an ozone generator is needed as a chemiluminescence trigger; its performance is not very stable, it requires frequent maintenance, and its cost is high. However, its sensitivity is slightly higher than that of FPD. For the detection of sulfur in petroleum products, I believe its cost-performance ratio is not as good as that of FPD, at least in terms of maintenance and operation. For the detection of natural gas and gaseous chemical products, SCD is a better choice; whereas for other liquid chemical products, this detector is not recommended. But those who sell such instruments with detectors are very likely to exaggerate the advantages of these detectors. AS*TM D5504 utilizes chromatography in combination with SCD for the determination of sulfur species, which is a good approach; however, if only total sulfur is to be measured, this method has few advantages aside from its high cost. Remember what I say: there is no medicine that can cure every disease. If someone claims otherwise, they are definitely selling fake drugs.
Thank you so much for your advice! In actual use, it really does seem to have a very low cost-performance ratio! Especially Antek’s SCD! It’s unstable; there are countless problems, and most importantly, when something goes wrong, you don’t even know who to turn to for a solution! Their engineers don’t seem to know much about the subject; they don’t even know how to solve simple problems, and they’re confused about many issues themselves. I feel like I’ve been deceived now. . . . . .
Some engineers from instrument and meter companies have either just graduated from school or have worked in practical roles for only a few years; they lack both technical experience and professional skills. When they work as representatives for technical support or sales support in such companies, it gives the impression that they are trying to deceive people or exaggerating things. You can consult with people who have used such instruments, and you should also give the engineers from the instrument manufacturers a chance to learn and improve.