AgTalk Home
AgTalk Home
Search Forums | Classifieds (85) | Skins | Language
You are logged in as a guest. ( logon | register )

Raven nh3 flowmeter calibration number
View previous thread :: View next thread
   Forums List -> Precision TalkMessage format
 
co2shaun
Posted 2/26/2014 17:43 (#3718579)
Subject: Raven nh3 flowmeter calibration number


NW KS

I have a raven nh3 flowmeter but can't seem to find a calibration number. The flow meter is stainless steel and is 1.5". I also need some information about the calibration number. I thought I read somewhere that raven calibration number measure 10 units of product. I'm not using this flow meter with a raven console.





(meter.jpg)



Attachments
----------------
Attachments meter.jpg (24KB - 601 downloads)
Top of the page Bottom of the page
Willy
Posted 2/26/2014 17:51 (#3718597 - in reply to #3718579)
Subject: RE: Raven nh3 flowmeter calibration number


Nebraska		Hope this helps. Usually there is a tag on the meter.

http://www.fertilizerdealer.com/itemFiles/Accuflow.pdf

Adjusting the Meter Cal
Locate the meter cal value printed on the tag attached to the AccuFlow™ flow meter. This value will be referred
to as the “original meter cal.” The original meter cal can be adjusted to display application rates in either
pounds of actual nitrogen per acre (lbs(N)/acre), or kilograms of actual nitrogen per hectare (kg(N)/ha). If the
meter cal label displays an NH3 calibration value, the meter cal does not need to be adjusted.
Note: All volumes will be displayed in pounds [kilograms] of actual nitrogen. To properly control the
application of anhydrous ammonia, enter the target application rates as pounds [kilograms] of
actual nitrogen per acre [hectare] or lbs(N)/acre [kg(N)/ha].
Use the following formulas to adjust the original meter cal for the desired display preferences:
(lbs(N)/acre) Original Meter Cal / 4.22 = Adjusted Meter Cal (EQ 2)
(kg(N)/ha) Original Meter Cal / [0.506] = Adjusted Meter Cal (EQ 3)
Round the calculated value to the nearest 3 digit whole number and enter the value as the meter cal on the
Raven console.
For Example:
Given an original meter cal of 720 [190].
(lbs(N)/acre) 720 / 4.22 = 170.62 (EQ 4)
(kg(N)/ha) 190 / [0.506] = 375.494 (EQ 5)
From the calculated values, round the adjusted meter cal value to 171 [375] and enter this value on the
Raven console

Edited by Willy 2/26/2014 17:52
Top of the page Bottom of the page
co2shaun
Posted 2/26/2014 18:06 (#3718633 - in reply to #3718597)
Subject: RE: Raven nh3 flowmeter calibration number


NW KS		That should help.
Top of the page Bottom of the page
co2shaun
Posted 2/26/2014 18:03 (#3718625 - in reply to #3718579)
Subject: RE: Raven nh3 flowmeter calibration number


NW KS		Is the tag with the calibration number on the flow meter or on the sensor that screws into the flowmeter? I remember there being a tag on the sensor but wasn't sure if this was the calibration number since the sensor can be removed and replaced.
Top of the page Bottom of the page
kweber1911
Posted 2/26/2014 20:12 (#3719034 - in reply to #3718579)
Subject: RE: Raven nh3 flowmeter calibration number


South Dakota		Willy is correct. A good starting point would be around 168-170

The tag would be on the sensor cord

Edited by kweber1911 2/26/2014 20:13
Top of the page Bottom of the page
tedbear
Posted 2/27/2014 08:41 (#3720014 - in reply to #3719034)
Subject: RE: Raven nh3 flowmeter calibration number


Near Intersection of I-35 & I-90 Southern Mn.
kweber1911 - 2/26/2014 19:12

Willy is correct. A good starting point would be around 168-170

The tag would be on the sensor cord


That would be the correct number for using a Raven display and measuring the amount of actual "N" with a Raven display. The OP stated that they are not using a Raven display/controller. This means that their correct cal number for NH3 may be different.

For an Ag Leader system, the cal number would be the normal liquid number (around 740) divided by ten which would result in using 74.0. The Ag Leader system uses the regular liquid number divided by ten (Ag Leader uses the cal for 1 unit whereas Raven uses 10). The Ag Leader system does the conversion for actual "N" and "NH3" internally for you.

Using the Raven number of 170 divided by 10 would result in 17.0. If you use that number you will only be applying about 1/4 the amount you had intended. I made this mistake when I first used Ag Leader with my NH3 system that had been run with a Raven 440 prior to this.


Edited by tedbear 2/27/2014 08:42
Top of the page Bottom of the page
co2shaun
Posted 2/27/2014 09:13 (#3720089 - in reply to #3720014)
Subject: RE: Raven nh3 flowmeter calibration number


NW KS		Thanks for the info tedbear. I'm using a Micro-Trak System but if I remember correctly the micro-trak numbers are very similar to agleader. I don't have everything in front of me to double check. Thanks for all the info everyone. I should be able to get everything figured out now.
Top of the page Bottom of the page
NEILFarmer
Posted 2/27/2014 10:11 (#3720236 - in reply to #3720014)
Subject: RE: Raven nh3 flowmeter calibration number


Morris, IL		Are pretty much all Raven NH3 flow meters a 740 Ted? We have one the tag is gone, i seem to remember it was 740 and then the Raven Fast valve was 743 or something like that. Does the 740 sounds right? Will be using the /10 for agleader but just wasn't sure on the starting point. This one is a 1.5" i believe but little different design then the flow meter above. Thanks. Come to think of it, the 168 for actual rings a bell as well but i forget how you come up with that number now to work backwards.

Edited by NEILFarmer 2/27/2014 10:14




(IMG_0650.jpg)



Attachments
----------------
Attachments IMG_0650.jpg (30KB - 487 downloads)
Top of the page Bottom of the page
kweber1911
Posted 2/27/2014 11:20 (#3720360 - in reply to #3720236)
Subject: RE: Raven nh3 flowmeter calibration number


South Dakota		the flowmeters can range from 710 to 740...maybe even further than that. a good starting number would be 710 or 720.

to go back to the original meter cal, it would be 168 x 4.22, for raven equipment.
Top of the page Bottom of the page
NEILFarmer
Posted 2/27/2014 12:18 (#3720457 - in reply to #3720360)
Subject: RE: Raven nh3 flowmeter calibration number


Morris, IL		Thanks, i just looked in an old 440 manual and it show 175-176. 175.355 would be a 740 so i'm going to go with that. Should put a new tag on the flowmeter so i don't forget again. I know i put 740 in the raven one time and kept with a nitrogen rate, it didn't like that too much.
Top of the page Bottom of the page
tedbear
Posted 2/28/2014 06:54 (#3722006 - in reply to #3720236)
Subject: RE: Raven nh3 flowmeter calibration number


Near Intersection of I-35 & I-90 Southern Mn.		The flowmeters shown on the two photos behave the same. I believe the change was made in the interests of manufacturing costs. The internal components are the same and the discussion about Meter Cals applies to both.

The conversion number of 4.22 comes from the fact that a gallon on NH3 contains 4.22 pounds of Actual Nitrogen. So by dividing the liquid meter cal number by 4.22 you get a new number that reflects the number of pounds of Actual Nitrogen that is being applied. This allows the operator to enter target rates as "Pounds of Actual Nitrogen" which is what most farmers desire to use.

Notice I continue to use the word ACTUAL to emphasize the difference between Actual Nitrogen and NH3. Remember that NH3 contains 82% Actual Nitrogen. The difference between "pounds of actual N", "pounds of NH3" and a measuring device that measures volume rather than weight has caused considerable confusion.

In the very earliest days of using a Raven NH3 system, the regular meter cal was used but the operator entered in the target rate as "gallons of NH3" desired. Raven provided a chart to convert the Actual N rate in pounds/acre to the Gallons of NH3 number to enter into the display. The chart merely divided the Actual N rate in pounds/acre by 4.22 to come up with the other number. Now it is usually done the other way around by using a converted Meter Cal and entering in the target rate in pounds of Actual N. Either way amounts to the same thing as long as you keep things straight.

Applying NH3 is not an exact science. This is due to several factors when comparing applying NH3 versus a liquid in a spraying situation. Here are few of the differences which are involved: With spray, the product remains a liquid at normal temperatures and pressures, with NH3, the product likes to turn into a gas. With spray, a pump is used to provide the push to move the product, the output of the pump is consistent and predictable. With NH3 the internal pressure of the tank is often the only source of the push to move the product. This push varies with temperature and other factors. With a spray system, finely machined tips are used to distribute the product, with NH3 a hole in a piece of tubing is often used.

Edited by tedbear 2/28/2014 07:01
Top of the page Bottom of the page
Jump to forum :
Search this forum
Printer friendly version
E-mail a link to this thread

(Delete cookies)