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Level measurement through Pressure

Created by: PILearner at: 4/24/2014 7:50 AM (12 Replies)

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4/24/2014 7:50 AM	Rate (0)
PILearner Posts: 80 Rating: (1)	how to use a pressure transmitter e.g P300 as a level measuring instrument. Also explain if this method is better than using a level instrument. e.g a radar or capacitance based device
PILearner Posts: 80 Rating: (1)
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4/24/2014 10:13 AM	Rate (0)
Celsius Regular Member Joined: 1/2/2013 Last visit: 2/8/2018 Posts: 38 Rating: (4)	Hello PILearner, Attached please find measuring setups for open and closed vessels taken from our catalog.Depending on the application you can use pressure or differential pressure transmitters. Advantage level measurement using a pressure transmitter:The level measurement with a pressure transmitter is more inexpensive. Advantage other methods:Some solutions will not be in touch with the medium. The density does not matter. The temperature does not matter. These are only some points. The right solution must be chosen according to the application. Attachment D:\Siemens\Katalog\Katalog_alt\2014\FI01_en_kap01 measuring setups.pdf (176 Downloads)

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4/25/2014 7:55 AM	Rate (0)
PILearner Posts: 80 Rating: (1)	I am unable to download this attachment. Will you please it?
PILearner Posts: 80 Rating: (1)
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4/25/2014 8:10 AM	Rate (0)
PILearner Posts: 80 Rating: (1)	I need a " Lvele Transmitter with a double Diaphragm" and with the following specs. Range : 0-10000 mm H2O Diaphragm size 3" capillary size : 4 meter hart protocol signal 4-20 ma dc loop powered 24 V dc with ;local display and all mountinfg acessories connection: 1/2" with cable gland
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4/25/2014 9:09 AM	Rate (0)
PILearner Posts: 80 Rating: (1)	foe teh above purpose I have selected 7MF4633-1GY2Z-2AB7-ZY21 Y21: mmH2O what is the size of the diaphragm inthis ? I require a 3" diaphragm. Mounting Flange: 7MF4912-3QA07 In the diaphragm size i this equal to 3 inches
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4/25/2014 9:21 AM	Rate (0)
Celsius Regular Member Joined: 1/2/2013 Last visit: 2/8/2018 Posts: 38 Rating: (4)	Hello PILearnerThe following combination will be suitable for your application:7MF4433-1FY22-2AC7-Z A01+Y01+Y21 {Y01: 0 ... 1 BAR_G} {Y21: mmH2O}7MF4923-1QA01-5BThis solution can measure the level in an open vessel.All details can be found in our catalog FI01 2014.Please contact your local sales for a possible quotation

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4/25/2014 9:30 AM	Rate (0)
Celsius Regular Member Joined: 1/2/2013 Last visit: 2/8/2018 Posts: 38 Rating: (4)	Hello PILearner,The combination 7MF4633 & 7MF4912 will come with a single process connection. Above you have asked for a double (closed vessel). A capillary will not be included in this order code. The remote seal will be 7MF4912-3QA07. The size of the diaphragm seal will be 3” class 150

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4/25/2014 11:46 AM	Rate (0)
PILearner Posts: 80 Rating: (1)	I need two remote diaphragms for closed vessel? do I need tp order TWo 7MF4923 remote seals for level measurement? Also the 7MF4433 pressure transmitter that you suggested, according to the catalogue this one is differential pressure and flow? will i be able to use it for differential level measurement a s well? Regards
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4/25/2014 12:29 PM	Rate (0)
Celsius Regular Member Joined: 1/2/2013 Last visit: 2/8/2018 Posts: 38 Rating: (4)	Hello PILearner,7MF4433 will be the right selection when you have to measure the level in a closed vessel. The application is described in our catalog FI01 2014 page 1/245. If you measure the level in a closed and probably pressurized vessel you will have to measure the static pressure at the upper measuring point and the static pressure & hydrostatic pressure at the lower measuring point. The difference of both will be the hydrostatic pressure (level). This will be the output of your differential pressure transmitter 7MF4433.7MF4923 will be the right remote seals for differential pressure measurement. This is what you measure in a closed vessel. 7MF4923 must be ordered one time only!

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4/25/2014 12:38 PM	Rate (0)
PILearner Posts: 80 Rating: (1)	Dear Mr. Celsius, Sorry to bother you again but I havent understood one thing. You said I have to order 7MF4923 only one. does this mean that when I order it only once without specifying the quantity , I will get two remote seal automatically. I am about to order these devices . Your prompt reply will be highly appreciated. Best Regards
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