[Gasification] Low Pressure sensors

Tue May 8 12:20:57 CDT 2012

Cuong, I have been waiting for someone else to suggest bin level sensors such as you are interested in but no one has come forward yet. Have you looked into rotary bin level sensor such as this in your search? http://www.monitortech.com/product_p_rotary.shtml The paddles can be located some distance from the sensor by increasing the shaft length.  The bearings can be protected from high heat by locating them farther from the body of the gasifier.

Art Krenzel, P.E.
PHOENIX TECHNOLOGIES
10505 NE 285th Street
Battle Ground, WA 98604

Until the pain of remaining the same is greater than the pain of change most people prefer to remain the same

 Date: Fri, 27 Apr 2012 15:31:05 +0700
From: pqcuong84 at gmail.com
To: nsyeecs at vsnl.com; gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Low Pressure sensors

Hi all!

I need a sensor control level rice husk in the reactor .if you  know methol usefull or sensor control level, you can help me.
I am working a gasifier rice husk type updraft,feed air lock.
Thanks!Cuong.pq

2012/4/27 SHIVANAND Ramachandran <nsyeecs at vsnl.com>

Pete,

We use MPXV7002 & MPXV5004, whose DP span is lesser ( but sufficient for our gasifiers)  but the the output voltage span is more. Which is important, considering  that the least count when measured using  Arduino is around 5 mV (5 V/1024).

So, if you use MPXV12 , which has an output span of 60 mV for a dP of 1020 mmWC, you will effectively get a least count of (1020/ (60/5))= 85 mmWC, which is of little use, unless you amplify the output of the transducer.

Regards

Shivanand Ramachandran

Infinite Energy (P) Ltd
New Delhi
On 26-04-2012, Pete & Sheri wrote:

Thank you, Shivanand.
  I have found the 10 Kpa range  sensors.  The MPX12DP, case 344. Is that what you use?  
  Is there a better choice?

Pete Stanaitis
----------------

From: gasification-bounces at lists.bioenergylists.org [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of SHIVANAND Ramachandran

Sent: Thursday, April 26, 2012 3:33 AM
To: gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Low Pressure sensors

Hi Pete,
We use arduino microcontrollers for our gasifiers.
You get low cost pressure transducers from Freescale semiconductors. They synch pretty well with the arduino hardware ( matching supply voltage and output range). They cost about $10 each and are very reliable and reasonably accurate if you take care of the electronics. You can easily get them on any online electronics store like digikey, mouser, etc.

I believe Allpowerlabs also use similar transducers (atleast look the same)

Regards

Shivanand Ramachandran
Infinite Energy Private Limited
First Floor, Baba House
149-A, Kilokri
New Delhi - 110014
Phone 011-65191937, 65273819
Fax : 011 - 26348472

On 26-04-2012, Pete & Sheri wrote:

Hello Stephen.

  The link you supplied to Dwyer was for a Switch, not a sensor.  I didn’t make myself clear.
I am looking for a sensor in the range of minus 20 inches WC to plus 20 inches WC that will give me an electrical output in proportion to the pressure being sensed, so I can graph the quantity and use its magnitude to control the system.

Sorry for my poor quality communication,
Pete Stanaitis
---------------

From: gasification-bounces at lists.bioenergylists.org [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of sabbadess at aol.com

Sent: Wednesday, April 25, 2012 2:18 PM
To: gasification at lists.bioenergylists.org
Subject: Re: [Gasification] Process controllers for gasifier/engine control and datalogging, Are there any Arduino users out there?

Pete,

Try this:

http://www.sustainablesupply.com/Dwyer-Instruments-ADPS-06-2-N-Pressure-Switch-Dif-p/w228350.htm?gclid=COu_36jb0K8CFcfb4AodKQxUHA&CAWELAID=1307461896&cagpspn=pla

At least it will give you a digital threshold.  I have had good luck with Dwyer stuff.

Stephen Abbadessa

-----Original Message-----
From: Pete & Sheri <spaco at baldwin-telecom.net>

To: Gasification <Gasification at bioenergylists.org>
Sent: Wed, Apr 25, 2012 2:46 pm
Subject: [Gasification] Process controllers for gasifier/engine control and datalogging, Are there any Arduino users out there?

I have been interested in Jim Mason (and company)’s approach to process control and datalogging  using an Arduino based microcontroller since he first announced its existence.  I have done a little googling about Arduino in general, and now I am sorta fascinated with it.  I already have a fair amount of electronic hobby stuff around here, so I bought an Arduino ATMega2560 last week ($60) and am starting to get familiar with it.

  The reason for this post:

  Is anyone else out there using the Arduino  as a process controller?

And, has anyone found inexpensive low pressure sensors?  I can’t seem to find any in the +/- 20 inches WC range that are cheaper than about $40 in a 1 to 3 quantity.

If you don’t know what I am talking about,  go to:

http://wiki.gekgasifier.com/w/page/6123727/Gasifier-Control-Unit

(If I was a little farther along, I’d just buy one)

and then go to:

http://www.arduino.cc/

A whole ‘nother world!!!

Pete Stanaitis

---------------- 

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