Near Intersection of I-35 & I-90 Southern Mn. | The purpose of the cooler or heat exchanger is to purposely use a bit of NH3 and allow it to vaporize which in turn cools the incoming NH3 to keep it in a liquid state so the flow measuring device can accurately measure the quantity. If the NH3 is allowed to be in a part liquid/part vapor state, the flow meter will no accurately indicate the flow rate.
I have seen systems where the Hiniker cooler(s) were replaced with Raven coolers. I believe the Raven coolers had more capacity and less problems.
Raven flow meters typically ran on a 5V supply. Hiniker flow meters typically ran on a 12V supply. This meant it was possible to use a Raven flow meter in a Hiniker system if one reduced the supply voltage to the Raven flow meter. Later Raven flow meters could tolerate the 12V supply voltage so this was no longer an issue. The Raven and Hiniker flow meters were equivalent in the sense that they produced shorting pulses as an indication of the flow rate.
As I recall in the very early days, Hiniker used a combination paddlewheel/control valve combination assembly to determine the flow and control all in one unit. It literally had a stub cable to deliver the flow information to the controller and a stub cable to receive the control signals for the control portion.
Later Hiniker went to a separate turbine flow meter which then lead to a control valve on its way to an ON/OFF valve much like a Raven system. The system shown in the picture is this style. It appears to use two Hiniker coolers.
Edited by tedbear 12/25/2024 06:54
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Hiniker cooler
