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CPU 1214C DC/DC/DC with batch controller Burkett SE35

Created by: Milosh at: 6/11/2014 8:28 PM (19 Replies)

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8/20/2014 7:50 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 6/18/2025 Posts: 640 Rating: (12)	huggy_d1 I suggested setting the HSC configuration to frequency. Then your flow rate, Q, is directly proportional to frequency, f, by the K factor, 66,5 ppl. If your HSC input is ID1000 is the frequency measurement, you will want to tune your digital input filtering to match your needs as well - which you may have done already for the HSC to work. To get your Q, simple algebra: Q = f / k = ID1000 x 66,5 x time-scale-factor-as-required Please post back what you find. Sorry, but I didn't understand what is time-scale-factor???

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8/20/2014 7:56 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 9/16/2025 Posts: 16096 Rating: (2515)	flow measured in human terms, like litres/sec, litres/min, litres/hour ... Time scalefactor changes it from litres/sec to whatever unit you need. Do the math to obtain your time-scale-factor and put it there.
	science guy
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8/20/2014 8:13 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 6/18/2025 Posts: 640 Rating: (12)	Hmmm. ok, but whith that math I only know which is the curent flow rate (litres per second)? how to know how many litres flow throught the flowmeter? Sorry, but maybe I didn't understand...

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8/20/2014 8:20 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 9/16/2025 Posts: 16096 Rating: (2515)	Milosh Hmmm. ok, but whith that math I only know which is the curent flow rate (litres per second)? how to know how many litres flow throught the flowmeter? Sorry, but maybe I didn't understand... Ok, I think I understand what you mean. You need to know how much of something has flowed, not how fast it is flowing. In that case, you would use your HSC as a counter, and when you start your batch, you set the count to 0, and count up until you have reached the required amount of stuff. The problem then relates to the K factor to know there are "k" pulses per litre. So start counting until it reaches the right number of pulses. Your recipe will define how many litres, right?
	science guy
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8/20/2014 8:31 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 6/18/2025 Posts: 640 Rating: (12)	Yes, that's it. I think like this: 1. K factor is 66,5 pulses per liter 2. So one pulse is about 0,015 litres (1/66.5) 3. operator set litres on touch panel ( example 10 litres) 4. when convert that, it's 665 pulses (10l * 66,5 p/l) 5. when counting one pulse is about 0.015, so when multipling pulse*0.015 I get the amount of flow in litres Right?
	Last edited by: Milosh at: 8/20/2014 8:33 PM
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8/20/2014 8:50 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 9/16/2025 Posts: 16096 Rating: (2515)	Sounds right to me.
	science guy
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8/20/2014 9:16 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 6/18/2025 Posts: 640 Rating: (12)	Can now explain your calculate of flow rate, pls? It's interesting tofor me... So if you have little time to give some example for math you provide in earlier post: Q = f / k = ID1000 x 66,5 x time-scale-factor-as-required let say that I need Q in m/s???
	Last edited by: Milosh at: 8/20/2014 9:18 PM
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8/20/2014 9:35 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 9/16/2025 Posts: 16096 Rating: (2515)	Milosh Can now explain your calculate of flow rate, pls? It's interesting tofor me... So if you have little time to give some example for math you provide in earlier post: Q = f / k = ID1000 x 66,5 x time-scale-factor-as-required let say that I need Q in m/s??? If you can convert your fluid flow rate from litre/sec to meter/sec, then yes, I can explain. You need to know how many meters equate to a litre, which will involve the pipe diameter and volume per meter. If you are looking for details on this, your favorite fluid dynamics wiki site can provide much more in the way of details, formulae, and explanation. f = pulses / sec (or 1/sec) k = pulses / litre f / k = (pps / ppl) = l/s (unit analysis) Q = flow rate = l/s Your controller documentation maystate f = Q x k, and I just turned it around for you.
	science guy
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8/20/2014 9:56 PM	Rate (0)
Milosh Silver Member Joined: 8/16/2010 Last visit: 6/18/2025 Posts: 640 Rating: (12)	Yes you are right. f=kxQ => Q=f/k => frequency (ID1000) [p/s] / 66,5 [p/l] So i get flow rate in litres per second?

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8/20/2014 10:08 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 9/16/2025 Posts: 16096 Rating: (2515)	Milosh Yes you are right. f=kxQ => Q=f/k => frequency (ID1000) [p/s] / 66,5 [p/l] So i get flow rate in litres per second? Correct. If you need it in other unit(s), just scale either for litres or seconds to whatever unit you need. If you end up trying to do mass flow rate, you will have to enter the density in your recipe. If the density changes with time, well, now you have a problem estimatingmass, and your controller may not be the right solution.
	science guy
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This contribution was helpful to 2 thankful Users Milosh michael_z_liu

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