What is the highest accuracy grade for domestic and foreign transmitters available on the market currently?
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This post was last edited by 955559 on 2018-8-15 07:13. What is the highest accuracy level available for transmitters of various brands, both domestic and international, in the current market? Is the Rosemount transmitter the one with the highest accuracy level, at 0.075%F? Are the others not as good? Is there an accuracy grade of 0.065%F? I actually saw in a specification sheet that the required accuracy for the instrument is 0.065%. I would be extremely grateful if experts could let me know via private message or a reply
1. The answer to the question you asked can be found in this post: https://bbs.hcbbs.com/forum.php? ... &extra=#pid20560287 2. In most cases, users pay for high precision, but what they actually get is not high precision itself; rather, it’s the high reliability that comes with high-precision instruments. 3. From the perspective of instrument manufacturing, the prerequisite for achieving high precision is high stability. The prerequisite for achieving high stability is high resolution, and the prerequisite for achieving high resolution is a high level of resistance to electromagnetic interference. In other words, high-precision instruments inherently possess high stability, high resolution, and high resistance to electromagnetic interference—and high reliability essentially refers to these three qualities. 4. Furthermore, when true high precision of 0.05 level or better is sought, instrument users will not opt for 4–20mA signals—because accurately acquiring current signals is also a challenging task. At this point, almost all instrument users will choose the digital communication format for output (note: with the exception of a few idiots, of course). The value measured by the instrument, as well as the measurement error, remain exactly the same once they are read by the host computer – not a single digit changes. 5. 0.01 high-precision instruments, control instruments based on new concepts; see this attachment: 1413288
The last edit to this post was made by 1111111 on 2018-8-14 at 23:12. 1. The answer to the question you asked can be found in this post: https://bbs.hcbbs.com/forum.php? ... &extra=#pid20560287. 2. In most cases, users pay for high precision; what they actually get is not high precision per se, but rather the high reliability that comes with high-precision instruments. 3. From the perspective of instrument manufacturing, the prerequisite for achieving high precision is high stability; the prerequisite for achieving high stability is high resolution; and the prerequisite for achieving high resolution is strong resistance to electromagnetic interference. In other words, high-precision instruments inherently possess high stability, high resolution, and strong resistance to electromagnetic interference—and high reliability essentially refers to these three qualities. 4. Furthermore, when true high precision of 0.05 level or better is sought, instrument users will not opt for 4–20mA signals—because accurately acquiring current signals is also a challenging task. At this point, almost all instrument users will choose the digital communication format for output (note: with the exception of a few idiots, of course). The value measured by the instrument, as well as the measurement error, remain exactly the same once they are read by the host computer – not a single digit changes. 5. 0.01 high-precision instruments, control instruments with new concepts – check this out
Ask the designer why 0.065% was written down; he probably doesn’t even know.
Yokogawa’s EJA models have a standard accuracy of 0.065%; the reference accuracy for calibrated ranges is also 0.065% of the range value. The Rosemount 3051S model can achieve an accuracy of up to 0.025%
As a user, I don’t think it’s necessary to pursue high precision all the time. Firstly, the cost is high; secondly, there is a certain range of control within actual manufacturing processes – who would demand that pressure be controlled to several decimal places? How can production be carried out like this? Of course, we’re not averse to high precision either; options with low costs and excellent performance specifications are also acceptable.
The design basis may be related to the manufacturer’s reshaping data.
Honey has 0.065, and Yokogawa EJA also has it
The EJA-A series has a precision of 0.075%, but the current EJA-E series has a maximum precision of 0.055% (0.04% in fact). Normally, a precision of 0.1% is sufficient; higher precision isn’t necessary, as your own testing setups don’t have the capability to verify such high levels of accuracy :lol