Yup, and you are not running the pump at close to stall conditions either (high pressure, low flow).
What does a multi stage pump do? And when would you want to use that vs. any normal pump?
Is it just a pump that ramps up the presure or water flow instead of just being on/off?
I guess is also cost much more?
90‰ of borehole pumps that you buy from the shelve nowadays are multistage pumps. When you restrict a multistage the water just stops moving and the amps on the motor drops because the motor stops working. The pressure basically remains stable in the pipe and does not increase due to the blockage.
When you use a mono stage pump a blockage will cause the pressure to increase till the point where a pipe burst or something in the pump breaks. This nice increase in pressure can be used to switch a pressure switch and I have used this method a few times.
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Here is the ball valves we talking about. I was at Agrico to get stuff for our new garden and took some photos to show what we talking about.
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The brass ones are what you’d use in any water trough (krip) where animals would drink.
@Plonkster,
Earlier on this thread I alluded to an idea that it is better to extract various data out of the Venus device using Modbus TCP to a PLC.
This in turn could be supplemented with any number of additional digital inputs and analogue sensors to produce multiple automated outputs across the property with wireless connections. ( probably using RS485 - Zigbee connections)
This is going to be a learning curve but after a brief investigation, I think I’ll manage PLC ladder logic.
Now, I hear people talking about NODE-RED functionality.
Can you enlighten me (as a complete novice) as to the pros and cons? It sounds to me that the Node-RED option all happens in the cloud?
I don’t know Node-Red all that well. What I know is that you can run it on the large-image variants of Venus, and that it is not a cloud-based thing, it hooks into a local mqtt server and can do all sorts of automation.
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Local expert on that, in my view, is @Paul
Measuring the pressure in the pipe might be a problem when you open a tap and the water start flowing and the pressure drops and the sensor thinks the tank is empty. Also if you pumping water into the tanks the pressure will increase and the sensor will think the tank is full. Above assumes you fill and drain the tank through the same pipe.
@EduanTek
The closed solenoid valve in the pipe will split the system so that the pump won’t start.
Edit: Will opening a tap decrease the pressure in an open system?
Is that how the pressure switch works on a pressure pump?
Is that an open system?
I would argue that from the pump to the tap is a closed pressurized system and that is why the pressure drops when a tap is opened.