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Raven 440 nh3 monitor- what newer model replaces it ??
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Posted 11/20/2023 06:16 (#10489009 - in reply to #10488847)
Subject: Old Techs observations

Near Intersection of I-35 & I-90 Southern Mn.
71307140 - 11/19/2023 22:28

Having troubles with our 440 nh3 console and may need a replacement , is there a newer model that replaces these or does anyone sell any reconditioned units ?
Having problems with ours and have traced it back to the monitor- only use it for ammonia applicator…

You ask several questions here: 1) can your 440 be repaired? - yes in most cases. 2) is there a newer model that replaces it" - yes you have a wide range of possible replacements. The 440 itself has been discontinued but the model 450 is still available. The 450 behaves like the 440 but has 6 boom capability. A 450 would plug right into your present wiring.

With this being said, I strongly suspect your problem is with the wiring, flow meter, control valve etc. rather than the 440 itself. Running the NH3 tanks low which allows vapor to pass through the flow meter will do extensive damage to the internal parts very quickly.

There would be several sources for a good used 440 or 450, if you feel you want to stick with them.

There are many other alternatives that add some nice features such as mapping etc. These other options can be very useful if the display would be used for other tasks such as spraying, planting etc. There are many possible routes to take. The choice of which one to pursue would depend on what you hope to accomplish, your plans for the future and your budget.

If you could describe your problems, there may be a simple explanation. For example, last week my great nephew reported to me that our 450 was not always responding to turning on the master switch. I had him flip the master ON/OFF several times (tends to clean off any internal corrosion in the switch). This got it working again. Even though it seemed to cure the problem, I decided to replace the Master Switch. This was a rather easy swap and should be a better long term solution.

Edited by tedbear 11/20/2023 06:20
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