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View Full Version : Suggestions requested for reasonably priced Water Pressure Transducer



Wurlitzer
09-09-2007, 10:29 PM
I want to replace my mechanical well pump pressure switch with some Propeller driven bells and other noise makers. I need a device to measure water pressure in the 20-60 PSI range. Searching for an hour on the web nettedˇ some rather nice devices in the $450 range but I am looking for maybe the $50 range.

In addition to turning the well pump on and off I want to monitor andˇarchive pump run time and use that run time to calculate the appropriate time to operate a solenoid which dispenses chlorine into the well.

I will also be monitoring the level of chlorine in a separate tank and annunciating when it gets low.

An LCD display will round out the application but only if I can find a reasonably priced pressure transducer.

NOTE: As the transducer will be place in front of the water conditioning system it will be exposed to water containing some small percentage of chlorine and the various dissolved crud found in well water.

MarkS
09-09-2007, 10:40 PM
Digi-Key has some pressure sensors that can read well above what you require and are far cheaper than $450. I'll try to find them for you. Give me a minute. Do you need PSIA or PSIG?

MarkS
09-09-2007, 10:44 PM
Digi-Key part# 480-1927-ND (http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=480-1927-ND) 0-100 PSIG Solid State Pressure Sensor $23.95

Digi-Key part# 480-1917-ND (http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=480-1917-ND) 0-100 PSIA Solid State Pressure Sensor $23.95

parsko
09-09-2007, 10:57 PM
Wurl,

I think Mark is leading you in the right direction. But, he specified parts to be used with gases, not liquids. I think the next ones down the page, for instance, 287-1119-NC, will suit you better. I have one of the ones for gases, and it works great for that. The PCB ones work really good for vacuum. There are no barbs to hold the hose on, so I would not trust them much at higher pressures without a zip tie. The ones with an NPT thead are likely better to fit your system.

Hey mark, is it late where you are? :) :)

-Parsko

MarkS
09-09-2007, 11:06 PM
parsko said...
Wurl,

I think Mark is leading you in the right direction. But, he specified parts to be used with gases, not liquids. I think the next ones down the page, for instance, 287-1119-NC, will suit you better. I have one of the ones for gases, and it works great for that. The PCB ones work really good for vacuum. There are no barbs to hold the hose on, so I would not trust them much at higher pressures without a zip tie. The ones with an NPT thead are likely better to fit your system.

Hey mark, is it late where you are? :) :)

-Parsko


Its 287-1119-ND I was going to quote one of those, but I was factoring in the price.

Nope, its only 11 AM here.

Wurlitzer
09-09-2007, 11:09 PM
WOW. thanks guys! Quick and valuable responses! You just cannot beat this group!

MarkS
09-09-2007, 11:12 PM
Sure you can! Just give me a lot of cash and I'll answer any questions you have. http://forums.parallax.com/images/smilies/smilewinkgrin.gif



















Wont guarantee they'll be correct, but I'll answer them....

Post Edited (MarkS) : 9/9/2007 4:21:52 PM GMT