Navitron Renewable Energy and Sustainability Forum

SOLAR THERMAL => Solar (and other) Data Logs => Topic started by: 2ndBillericay on August 03, 2012, 02:31:24 PM



Title: Pressure Sensor in hot water
Post by: 2ndBillericay on August 03, 2012, 02:31:24 PM
In order to add the pressure reading to the data shown by my Resol DL2 data recorder i am looking for a cheap (under GBP 50) electronic pressure sensor.


Has anyone found a suitable sensor ?

Thanks


Title: Re: Pressure Sensor in hot water
Post by: Iain on August 03, 2012, 02:40:07 PM
Hi
I was looking at these in RS. Quite a few with different parameters. Worth a look possibly.
http://uk.rs-online.com/web/p/pressure-sensors/7191144/
Iain


Title: Re: Pressure Sensor in hot water
Post by: 2ndBillericay on August 06, 2012, 02:03:28 PM
I was looking at similar but not sure about interfacing the air sensor with the water in the solar heating system.

i was wondering about a PX40-100G5V but again the connection issue confused me a little as the pope attachment is only 2.8mm diameter. I would need to connect some pipe that i could fix securely to it and then add a water fixing on the other end.

Any ideas ?

Thanks


Title: Re: Pressure Sensor in hot water
Post by: JohnS on August 06, 2012, 07:02:11 PM
2nd Billericay

Sorry to be off topic, but I know you will see it here.

Has anything happened to your PV?  Production, per BDPV, seems to be down a lot this year.

John


Title: Re: Pressure Sensor in hot water
Post by: Les101 on August 06, 2012, 09:04:35 PM
Can you use an electric oil pressure sensor off a car? Should have no problem with the temperatures involved


Title: Re: Pressure Sensor in hot water
Post by: noah on August 07, 2012, 11:36:35 AM
I have concerns about pope attachments. Let`s keep the forum secular guys.


Title: Re: Pressure Sensor in hot water
Post by: 2ndBillericay on August 07, 2012, 11:52:48 AM
that could be worth a try, i just need to find one that will give a decent electronic output. I dare say (before looking) that fords etc dont give out spec for the parts.

More thought needed on this avenue.

Thanks


Title: Re: Pressure Sensor in hot water
Post by: Iain on August 07, 2012, 12:19:30 PM
Hi
A lot of the VDO sensors work on 10 ohms to 184 ohms range. You just have to pick the correct pressure range. I think the American sensors / gauges work the opposite way around to the European ones.
IE (VDO-European) I think!! 10 ohms = 0 pressure.. 184 ohms = full pressure
American I think are the other way around 184 ohms = 0 pressure .. 10 ohms = full pressure.

I think most older car/boat pressure gauges work on similar standards.
 A local had a boat with a VDO sender with a Vetus Gauge. On 0 Bar engine pressure gauge reads max. As the pressure increased the reading on the gauge dropped. We just fitted a VDO gauge and all worked correctly.!!

Iain


Title: Re: Pressure Sensor in hot water
Post by: 2ndBillericay on August 07, 2012, 02:20:33 PM
Time to see what i can find on ebay. Lets see if i can find a sensor that gives a graduated reading rather than pressure/no pressure/high pressure.



Title: Re: Pressure Sensor in hot water
Post by: Iain on August 07, 2012, 03:01:25 PM
Hi
This one is 0-2 bar, or there must be similar.
http://www.gtfabrications.com/product.php?productid=434
Iain


Title: Re: Pressure Sensor in hot water
Post by: baker on August 07, 2012, 07:06:07 PM

 some sunier duval combi
and some glowworm combi,s have a LCD linear graph analogue water pressure  display and sensor
maybe worth a look
baker