[Gasification] wood moisture meters?

[Tom Miles]

The Ligno meter cited works fine. Notice the short pins. Hopefully you have
chunks that are big enough for the pins. Delmhorst
(http://www.delmhorst.com/) meters are probably the most used in lumber and
hay applications. They're not cheap. 

Tom 
 

-----Original Message-----
From: gasification-bounces at listserv.repp.org
[mailto:gasification-bounces at listserv.repp.org] On Behalf Of jim mason
Sent: Sunday, December 23, 2007 3:46 PM
To: Discussion of biomass pyrolysis and gasification
Subject: Re: [Gasification] wood moisture meters?

this has all been very helpful.  both on real time moisture meters as
well as the microwave method.  thank you.

here is a short review on one of the cheaper moisture meters.
http://www.rockler.com/product.cfm?Offerings_ID=11447&TabSelect=Reviews&cook
ietest=1

as for specific ones, do people have suggestions for models they've
used and found impressive/adequate?  ones to avoid?

jim





On Dec 23, 2007 1:27 PM, andrew <list at sylva.icuklive.co.uk> wrote:
> On Sunday 23 December 2007 16:58, Tom Miles wrote:
>
> > Microwave on High
> > Place 50 gm sample on 3 paper towels (industrial towels work fine.
> > They are about 3 gm per towel.)
> > There are different drying schedules for hog fuel, chips or
> > sawdust. I think the standard calls for 1600 W microwave. All
> > heating on high. In general for fine wet fuel:
> > 1 min on high. Stop weigh and fluff,
> > 1 min on high. Stop weigh and fluff
> > 1 min on high. Stop weigh and fluff
> > 30 sec on high. Stop weigh and fluff.
> > Repeat until weight is stable.
>
> Thanks for that
>
> This is similar to what I've been doing except my microwave is 600W
> and I use the defrost setting for 20 minutes.
> >
> > I was running about 10-15 min per sample total. The stirring is
> > important because it releases moisture. As with any material it is
> > easy t overcook the sample.
>
> Yes the steam leaving the sample can easily be hot enough to pyrolyse
> the sample and that constitutes a loss of dry matter, the vinegary
> smell is the first sign you get.
> >
> > Moisture meters measure electrical resistance. They are fine when
> > the probe is sticking in the same chunk of wood, or in hay bales
> > that are reasonably packed (10 lb/ft3, 160 kg/m3). They are now
> > accurate up to about 40% MC. They are no good for loose materials
> > like straw, chips or hog fuel.
>
> And as I said they are only any good on homogeneous samples as they
> only measure the path between the probes, so a wet bit in the middle
> of a log will not be measured.
>
>
> AJH
>
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-- 
----------------------------------------------------------------------------
----
jim mason
website: www.whatiamupto.com
current project: mechabolic (http://www.mechabolic.org)
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