Circupool RJ30 Thermometer Sensor

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Nochain

Well-known member
Nov 28, 2022
72
Arizona
So I don’t expect anyone necessarily to have any experience on the Circupool RJ Series Original Salt Generator but my question could be more general about salt cells and the control equipment.

My cell has 3 wires to the salt cell only. No flow meter. Does anyone know how the salt generator measures water temperature, no water and salinity with only 3 wires that also supply voltage to the plates?
 
PoolStored said:
Call Circupool. They are good folks and will answer your question...
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They are good folks but sales people. They market and sell what is designed, manufactured, and imported from China. I doubt they have a deep understanding of the electronics. They don’t need to.
 
Nochain said:
How does that get accomplished with an only 3 wires that also deliver power to the cell? Is it a resistance measurement on one of the plates?
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Dunno.

Why do you care?
 
I DID call them AND asked! I obviously did not get my answer and thought you guys might know. The reason why I’m asking is because I’m getting a no water fault and low salt. They told me that it could possibly be low temperature causing that. My salt is at spec 3500 but it is cold. So again with three wires which include power to the cell. How can a cell determine water temperature? It has only theoretically one extra wire, and that theoretically should be for ground the only way I think that this can be done is a resistivity measurement of the cell, but again the wires should be more power to the cell, and not resistivity measurement. This is why I’m asking.
Or more succinctly how do you supply power to the cell and make a thermal measurement with only three wires? This is a fundamental question and generic enough for anyone who knows how these cells work imo.
 
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ajw22 said:
Did you read…

Circupool SWG - Further Reading

www.troublefreepool.com www.troublefreepool.com

They have a hack to use an external temperature sensor.
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I did. What are you actually suggesting? I am asking HOW the RJ30 Classic can perform a water temperature test given that there is no dedicated thermal sensor and no nly 3 wires to the swg cell. Yet I am being told by CP that the water temp is too low and that could be a reason for the no water fault.
 

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Nochain said:
I did. What are you actually suggesting? I am asking HOW the RJ30 Classic can perform a water temperature test given that there is no dedicated thermal sensor and no nly 3 wires to the swg cell. Yet I am being told by CP that the water temp is too low and that could be a reason for the no water fault.
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I am suggesting that CP knows there are issues with the dedicated temperature sensor in the cell and has a hack for an alternative external temperature sensor.

Like I said in a post above you are taking to sales people. The answers you get may vary widely in technical accuracy.
 
JamesW said:
Can you show a picture of the wires?

Can you show a picture of the temperature sensor?
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What temperature sensor? I don’t see a stinking sensor! Thats my entire point! Control box has a simple cable to the cell. It has three wires Ted Blue Black that connect to the cell. THATS IT. How can you sense anything from that? Possible to get a resistance measurement MAYBE but those wires provide the voltage bias to the cells. So +/-V and a sense or gnd ?
 
With only three wires leading to the cell, possibly there is a circuit board imbedded in the cell housing that handles this. The wires may send the data to the control unit. The jumper on the controller board would allow that data to be bypassed and an external temp input allowed per the work-around in the article linked.

Or maybe there is a bi-metal switch in the cell that opens when the temp drops and theat throws those indications.

How old is the unit?

Since none of us can be exactly sure how it all works, it must work on the PFM principle. o_O
 
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The RJ-Series (Classic) Manual doesn't say anything about what each connection does in the cell itself.

RJ "Classic" Series Troubleshooting Guide HERE. It references the 3 wire connections (highlights the blue female) but does not specify the purpose of each cable. The color coded wires are hard-wired back to the module. You could trace them back to the module motherboard to see if you can determine their function (i.e. power, etc).

My cell has 3 wires to the salt cell only. No flow meter. Does anyone know how the salt generator measures water temperature, no water and salinity with only 3 wires that also supply voltage to the plates?
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A note from a DSP customer question about connecting the wires: The blue terminal goes in the middle, the other two plugs are interchangeable. That would seem to imply the two interchangeable wires are power. Perhaps blue controls the sensors?

DSP's link for cord replacement HERE

DPS cord repair kit HERE

Sorry I couldn't find more for you @Nochain
 
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@Nochain , you might give these folks a call. They may know since they sell a different version of the repair kit.

thepoolfolks.com

CircuPool 1/2 Lead Kit | CircuPool Classic | All Classic Models

Overview: Replacement for all CircuPool Classic model salt chlorinators and chlorine generators. Suitable replacement part. Features: 1/2 lead kit fits all CircuPool Classic models. Manufacturer part number JD363300LK Easily repairs damaged cell cord for CircuPool systems Cost effective way to...
thepoolfolks.com
 
Maybe it measures the conductivity of the water and then calculates the temperature based on the readings from the cell performance and the conductivity?

Maybe the sensor uses one of the pins as a ground return?

I don't really know how it would test the temperature with one wire.

Check the resistance from each pin to the other pins.

1-->2

1-->3

2-->3

Can you show if there is any type of sensor where the pin goes.
 

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