X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rv-out-0910.google.com ([209.85.198.191] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2242308 for flyrotary@lancaironline.net; Sat, 04 Aug 2007 12:46:14 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.198.191; envelope-from=rwstracy@gmail.com Received: by rv-out-0910.google.com with SMTP id c27so765933rvf for ; Sat, 04 Aug 2007 09:45:37 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:in-reply-to:mime-version:content-type:references:x-google-sender-auth; b=kUGL+TBxUtA+WDoy7ozNZnsFOEzFq8A9uUWJGjKRqi7eQpM8CV5DrB9KajmkqaneWl3ERRePy4GxPK7CDGY0JrCrVSF9GbLTRTSjVsFtpbQF23tT5966E2/LdUqtSnojhalVQd51FKtoWa31jEMHpiCBld2Q1ouX+hYnruMLYH0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:in-reply-to:mime-version:content-type:references:x-google-sender-auth; b=cupCWcCq2lY4UJDn/NQP1aTHISky901WaBptIiSNHk7+UHGpfzRlZsnUMTKNxAnIo2oeYakc4HDUTc7IeeV9TvGTyWMKVKPpnETabJG0A6MU8A2HWjpMqL/TIopKl+Cd6P0iU+mvDv+V3aHqRR+tNy/+Fq4/THVhOH6qUzn9BJI= Received: by 10.142.241.10 with SMTP id o10mr179866wfh.1186245936919; Sat, 04 Aug 2007 09:45:36 -0700 (PDT) Received: by 10.142.115.16 with HTTP; Sat, 4 Aug 2007 09:45:36 -0700 (PDT) Message-ID: <1b4b137c0708040945v3bc936d0iba893ef4d801e8e7@mail.gmail.com> Date: Sat, 4 Aug 2007 12:45:36 -0400 From: "Tracy Crook" Sender: rwstracy@gmail.com To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: EM2 & builder issues In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_104519_33345910.1186245936896" References: X-Google-Sender-Auth: 1585b4ca26649831 ------=_Part_104519_33345910.1186245936896 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Good tip Al, I just got the latest flyer from Harbor Freight with the $9.99 IR temp instrument but it may be a POS. I use a model IR201 EXTECH brand IR thermometer. I think it was around $45. on the web somewhere. It has been accurate to within 2 degrees so far, mainly varying with color or surface type. Shiny aluminum gives very big errors so the paint is a must there. Tracy On 8/4/07, Al Gietzen wrote: > > Tracy wrote: > > Bottom line is, if you need very accurate readings, learn to calibrate th= e EM2 if that is what you are using. To do this, you need a good reference= . The easiest way is to use a non-contact (infra-red) thermometer. Harbor= Freight and others are now selling inexpensive ones for about $10.00. No = reason for any airplane builder not to have one. Be sure to paint the tes= t points on the part to be measured with a spot of flat black paint to elim= inate emissivity errors > > > > Be careful; though. I haven't seen one for $10; but I did go to Harbor F= reight about a month ago, and bought one that was on sale for $39.95 (marke= d down for $59). I wanted to double check the temps in and out of the oil = cooler. It didn't take me long to realize it was not reading correctly. I= have a lab grade thermometer that I then checked it against. It was off a= bout 10 degrees or more at room temp on any surface. At higher temps it wa= s off by more (30 =96 40 F at about 180) on any surface with emissivity les= s than about .9. It was very accurate pointed at the cooler core (essentia= lly a 'black body' =96 emissivity very close to 1.0). I returned it for a = refund. Maybe you'll have better luck. > > > > I had previously borrowed one from a friend which was quite accurate, and= used it to calibrate coolant and oil temps. Air temp sensor and CHT TC ch= annels I calibrated using ice water and hot water with the lab thermometer = in it. I used pressure gauges to calibrate MAP and fuel and water pressure= . Yes, my MAP calibration data is different than Tracy's (I guess the pres= sure variation is different in FL J.) > > > > FWIW, > > > > Al > > > ------=_Part_104519_33345910.1186245936896 Content-Type: text/html; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Good tip Al,
 
I just got the latest flyer from Harbor Freight with the $9.99 IR temp= instrument but it may be a POS.  I use a model IR201 EXTECH brand IR thermometer.
I think it was = around $45. on the web somewhere.  It has been accurate to within 2 de= grees so far, mainly varying with color or surface type.  Shiny alumin= um=20
gives very big = errors so the paint is a must there.
 
Tracy


 
On 8/4/07, A= l Gietzen <ALVentures@cox.net<= /a>> wrote: 
Tracy<=
/span>
 wrote:
Bot=
tom line is, if you need very accurate readings, learn to calibrate th=
e EM2 if that is what you are using.  To do this, you need a good refe=
rence.  The easiest way is to use a non-contact (infra-red) thermomete=
r.  Harbor Freight and others are now selling inexpensive ones for abo=
ut $10.00.  No reason for any airplane builder not to have one. &=
nbsp; Be sure to paint the test points on the part to be measured with=
 a spot of flat black paint to eliminate emissivity errors=20

<=
span style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana"> 

Be careful; though.  I haven't seen one for $10; but I did go to Harbo=
r Freight about a month ago, and bought one that was on sale for $39.95 (ma=
rked down for $59).  I wanted to double check the temps in and out of =
the oil cooler.  It didn't take me long to realize it was not reading =
correctly.  I have a lab grade thermometer that I then checked it agai=
nst.  It was off about 10 degrees or more at room temp on any surface.=
  At higher temps it was off by more (30 =96 40 F at about 180) on any=
 surface with emissivity less than about .9.  It was very accurate poi=
nted at the cooler core (essentially a 'black body' =96 emissivity very clo=
se to=20
1.0).  I returned it for a refund.  Maybe you'll have better luck=
.
=
 
I had previously borrowed one from=
 a friend which was quite accurate, and used it to calibrate coolant and oi=
l temps.  Air temp sensor and CHT TC channels I calibrated using ice w=
ater and hot water with the lab thermometer in it.  I used pressure ga=
uges to calibrate MAP and fuel and water pressure.  Yes, my MAP calibr=
ation data is different than=20
Tracy=

's (I guess the pressure variation is different in FL J
.)
 
FWIW,
 
A=
l

 


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