How do I read this flow meter?

[Shollyg]

I have an inline chlorinator that I don't use that has a flow meter. I just had an aquacal heatpump/chiller installed that needs a 30-70gpm flow rate. I was hoping to use this flow meter to tell me how much I actually have pushing through. I can't read it though! I can barely see the numbers and I don't really understand them. It looks like one side tops out at 100gpm and the other at 12gpm but the increments in between are in .25. So confused! Please help me understand the flow based on this meter.

 

[1poolman1]

CMP?

 

[Shollyg]

CMP?

Yes, sorry. I should have specified that.

 

[1poolman1]

Yes, sorry. I should have specified that.

The best I could find is that the 12GPM side is for use when the meter is used on an off-line feeder (inlet and outlet tubing is small) and the 100GPM side is for an inline feeder.
That was from a friend who uses them.

 

[Shollyg]

The best I could find is that the 12GPM side is for use when the meter is used on an off-line feeder (inlet and outlet tubing is small) and the 100GPM side is for an inline feeder.
That was from a friend who uses them.

Given that, I'm wondering if the white floater about 1/2 way up = ~50gpm in the system as a whole.

 

[1poolman1]

Given that, I'm wondering if the white floater about 1/2 way up = ~50gpm in the system as a whole.

I wish I could say for sure, but that is what I was told. I have never used one and actually remove tablet feeders like that every chance I get. They can cause damage to the rest of the equipment if used with tablets.

 

[JamesW]

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[JamesW]

 

[JamesW]

Just get rid of the tab feeder and get a flowmeter if you want a flow meter.

What pump do you have?

What is the filter pressure at different pump speeds?

 

[reggiehammond]

I'm with @JamesW - rip all that junk out. The heater will tell you when flow is sufficient.

 

[Shollyg]

I'm with @JamesW - rip all that junk out. The heater will tell you when flow is sufficient.

Would love to replace with a Swg

 

[Shollyg]

Just get rid of the tab feeder and get a flowmeter if you want a flow meter.

What pump do you have?

What is the filter pressure at different pump speeds?

Unfortunately I had a more pressing need for measuring flow than that would take and was trying to do with what I had. :/

I have an Intelliflo vsf. I would have to do a little test on that (pressure vs pump speed). The pump gives me a flow rate but no way of knowing if it’s correct.

 

[JamesW]

Can you check the Power in Watts, the Flow in GPM and the System Pressure in PSI and filter pressure in psi for these speeds?

If yes, we can graph the system curve onto the pump performance curve like this to estimate the flow at any speed as well as compare it to the pump reading.

RPM...........Watts..........GPM.........System PSI (from pump).....Filter pressure.

3,450
3,110
2,750
2,350
1,725
1,500

RPM	Watts	GPM	System PSI
3,450	2420	91	32
3,110	1813	83	26
2,750	1277	74	20
2,350	816	63	14
1,725	334	45	7
1,500	230	41	5

 

[JamesW]

 

[Shollyg]

Can you check the Power in Watts, the Flow in GPM and the System Pressure in PSI and filter pressure in psi for these speeds?

If yes, we can graph the system curve onto the pump performance curve like this to estimate the flow at any speed as well as compare it to the pump reading.

RPM...........Watts..........GPM.........System PSI (from pump).....Filter pressure.

3,450
3,110
2,750
2,350
1,725
1,500

RPM	Watts	GPM	System PSI
3,450	2420	91	32
3,110	1813	83	26
2,750	1277	74	20
2,350	816	63	14
1,725	334	45	7
1,500	230	41	5

Yes. I can do that. Thank you!

 

[JamesW]

Note that you don't need to go to full speed because that might be too much pressure for your system.

Only go as high as maybe 2,450 rpm and we can use that.