Hi/Lo pressure switch

H

heffneil

Active Member
I have a pressure switch currently in place that I watch with my Omnipro when the pressure is low.  It works and it isn't a problem but I was hoping to find a switch that will replace that one and trigger when pressure is over a certain PSI (say 60 PSI) and below 30 PSI.  I could easily add another switch and I know I am being picky but that would require additional plumbing and fittings which seems silly.  This is for household potable water.
 
Thanks!
 
Neil
 
 
4 - 20 would be too low on both ends.  This is for household pressure from the well pump.  I had a sticking switch which wasn't recognized because I only monitor low (which mean the well pump didn't turn on).  I the current pressure is 40 PSI but dips and raises past that as it pumps.
 
Neil
 
I would think you would either have to use two switches w/ a tee, a sensor that has an analog output, or a smart sensor that lets you dial in the limits and has contact closures.
 
Do you have any information about this type of switch I am at a bit of a loss hence my asking the question originally.
 
Az1324 yes Basically I have a T that reduces down for the stem of the pressure switch.  I could probably add another one and if I can't find an inexpensive alternative I could do this.  I just believe in the less number of breaks in the plumbing the better.
 
heffneil said:
Do you have any information about this type of switch I am at a bit of a loss hence my asking the question originally.
 
Az1324 yes Basically I have a T that reduces down for the stem of the pressure switch.  I could probably add another one and if I can't find an inexpensive alternative I could do this.  I just believe in the less number of breaks in the plumbing the better.
Click to expand...
 
It's not a switch, it's a sensor.  So you will know the actual pressure as an analog value.  But how to interface it with your HAI panel would be the question.  There should be a way to make it behave like a temp sensor.
 
Yeah that is too complex and unnecessary for this application.  I don't really want to monitor the actual pressure.  I want to make sure it is within the high and low range.
 
Neil
 
I would also monitor pump current, just get a contact closure when the amperage is above a threshold.  Maybe use an RIBXGTA, then just monitor that contact closure.
 
This way you could easily troubleshoot a problem when married with your pressure monitoring.
 
5V could easily be obtained from the host panel with a resistor or two to drop the voltage.
 
Too tired to do the VD calcs using Ohm's law, but plug in the values.
 
I know of some switches, but are industrial grade, and are very expensive. I don't dabble in commercial/residential control.

What about using one from
A small air compressor?
 
az1324 said:
Oh come on just do it.  HAI has built in high and low temperature setpoints for alarm conditions so you're halfway there.
 
http://www.ebay.com/itm/Pressure-transducer-or-sender-100-psi-for-oil-fuel-air/250799543734
Click to expand...
 
http://www.ebay.com/itm/Pressure-transducer-sender-100-psi-stainless-steel-oil-fuel-air-water-/261260635816?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item3cd458eea8
 
This one is good for water.
 
And using resistors to drop the voltage is really not a good way to do that.  Here is a better way http://www.youtube.com/watch?v=CKS6zHo5T9k
 
Or, use a 12v car phone charger that can be had for a couple bucks.  Open it up and solder it in.
 
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