Advice needed for installing Stenner pump injector

[JoyfulNoise]

@Dirk , I'm thinking about this method for the above stenner pump setup which I questioned.
https://www.crmagnetics.com/Assets/ProductPDFs/CR4395 Series.pdf

If the pool pump is a single speed motor then a current sensing relay can be used. If the pump is a variable speed motor with a variable frequency drive, then the input current may not be the best measure of when the pump is running or not. At the very least, you’d want to have an additional flow switch in the plumbing to use as a safety feature.

What is your plan for using the relay ?

 

[wireform]

If the pool pump is a single speed motor then a current sensing relay can be used. If the pump is a variable speed motor with a variable frequency drive, then the input current may not be the best measure of when the pump is running or not. At the very least, you’d want to have an additional flow switch in the plumbing to use as a safety feature.

What is your plan for using the relay ?

I don't have a plan was just thinking what may work but have never used one. Thanks for the insight !

 

[PoolStored]

@Dirk , I'm thinking about this method for the above stenner pump setup which I questioned.
https://www.crmagnetics.com/Assets/ProductPDFs/CR4395 Series.pdf

This works extremely well. I have it installed and can help if needed...

 

[PoolStored]

If the pool pump is a single speed motor then a current sensing relay can be used. If the pump is a variable speed motor with a variable frequency drive, then the input current may not be the best measure of when the pump is running or not. At the very least, you’d want to have an additional flow switch in the plumbing to use as a safety feature.

It will work on a VSP. The CSR has a variable trip point...I run my VSP low and adjusted it for the lowest speed I run. I agree on the flow switch.

 

[Dirk]

@Dirk , I'm thinking about this method for the above stenner pump setup which I questioned.
https://www.crmagnetics.com/Assets/ProductPDFs/CR4395 Series.pdf

If you don't have automation that tells you when your pump is [supposed] to be getting power, then I think a current sensing solution is a good idea, although I don't have any direct experience with this MO. But I think the problem remains: the pump could be getting power (somehow) but still not be pushing water. Maybe an impeller problem? Or plumbing blockage?

No, I think flow detection is the better protection. Because that's what actually matters: flow: good, no flow: bad.

And of course both is best: confirmation that your pump is on (or supposed to be) and flow detection. I have both. And wrote about it here, which I think you've seen:

Hacking IntellipH to work in cold water

As Pentair IntellipH (IpH) automatic acid dosing system owners know, the IpH depends on a Pentair IntellliChlor (IC) saltwater chlorine generator. The IpH uses the IC's power supply, and monitors its flow switch, so that it won't dispense acid if the IC is reporting low flow. Unfortunately, it...

www.troublefreepool.com

Along with the flow switch installation, that thread includes a schematic for wiring the flow switch. It's kinda mixed in with other things my custom circuit is doing, so if you need me to separate out just the flow switch part, let me know.