Thank you hacksaw. I already realized that in the meanwhile. The accuracy of the PID controller is by itself already rougher than the requested accuracy.
I was thinking to use two different system, one to control, one to measure (where it is requested the real accuracy).
Do you have any advice...
Dear danw2,
reading the standard that I am trying to follow in this paragraph "
"Laboratory temperature measuring device, having an accuracy of +0.25% of the nominal rating, calibrated to a depth of 40 mm immersion, for determining temperatures of liquids in bath tests and operating...
Yes, indeed, it doesn't necessarily have to be that way, but making a hole in a €400 glass container is certainly not a simple solution. The fact that it’s made of glass is important for the experiment to be able to see what’s happening inside.
"Bent 90° in the heavy section" means what I highlighted in the attached documents?
In this catalogue https://cascade.net/wp-content/uploads/2020/05/Thermokoppel-catalogus.pdf I did not find any reduced tip PT 100. Can you help me in the selection?
Thank you danw2. I am concerned about the heater, I cannot find any of that shape online. By "sizing", I mean "determinate the power required to let the liquid to reach a specific temperature", but I am not able to design it in detail. If I know the power of the resistance can I choose the SSR...
Dear all,
This post is connected to a previous one, but since the questions are different and independent, I preferred to separate them into two posts. I need to replicate a very simple experiment, but I have some doubts about the necessary electrical components to execute it. Specifically, I...
Dear all,
I am planning to replicate a relatively simple experiment, but I have no prior experience in temperature measurement and control. I would like to manage it on my own, but I would appreciate any advice you can provide (even just to avoid unnecessary expenses) on selecting the most...
Good morning everyone,
NFPA 25 requires testing a certain sample of sprinkler heads every 10 years, while EN 12835 mandates it every 25 years. Neither standard, at least to my knowledge, specifies which standard should be used for the tests. I assumed they might follow EN 12259-1 and UL 199...
Hi,
I have some equally spaced point of a fire pump curve (flow rate-pressure). The data-sheet doesn't show the rated capacity. Is there a way to analytically find it? How the producer of fire pump determine it, once the experimentally obtain the pump curve?
Thanks
I asked this because I was wandering if someone perform test such as doorfan test in the stairwell before the design. I was wandering if it is a best practice
Hi all,
Designing a stairwell pressurized with the use of NFPA 92A, there is this table which represents the Leakage Areas of buildings. I particulary appraciate the fact that reference are presented, but I have a question: how can I say if a wall is tight average or loose? Is the choice of...
Hi,
the risk R can be estimated by the formula:
R = M*P
where M is the Magnitude and P is the Frequency.
I have two questions now:
1. Does the magnitude depends on the objective of the Analysis, if the Analyisis has as objective the Life Safety, than the M can be quantified in death, if the...
I am trying to understand how, once all the branches of the Event Tree Analysis are defined, it is possible to decide if a fire scenario should be analysed with a simulation. I don't know an 'a priori' criterion to quantitatively assess the damage (deaths or money), and I don't know which...
I completely agree, you pointed out something that I didnt' noticed reading my reference book of fire risk assessment.
It refers to probability placing in parenthesis "per year" and than it did not place any unit. Suqsequently it identifies f (which I assume is the frequency) as a value with...
I am reading a paper about a Failure Tree Analysis. When I was at university I did a course where the FTA was presented and we worked directly on the probability using the logic gates AND/OR.
In this paper they work on the failure rates. At the beginning I thought that the failure rate and the...
I have asked to some vendors, the price are about 40k in Italy. It seems to me a very high price. The prices on Alibaba are far lower. Do you think that there are opportunities to find lower prices somehow, maybe at exposition or at conferences?
