it says you're suppose to place the probe 3/4's of its length into the
exhaust pipe
Paul Tegler
1973 MGBGT OB (Blase Red, (orange))
1972 MGBGT YB (Primrose Yellow)
wizardz@amdyne.net
http://www.amdyne.net/~ptegler/mgmain.htm
-----Original Message-----
From: Paul Hunt <paul.hunt1@virgin.net>
To: Erik Brzoska <mowog77@hotmail.com>; mgs@autox.team.net
<mgs@autox.team.net>
Date: Wednesday, December 30, 1998 2:19 PM
Subject: Re: Gunson Gas tester Discussion
>Erik - I have been using a Gunsons for a while and also periodically remove
>the pickup from the exhaust to check (and adjust if necessary) the
>calibration from time to time as recommended in the instructions. However
I
>had not heard of purging the system after use, and cannot see reference to
>this in the instructions. I don't see what difference having the tester
>turned on or off makes as far as purging goes, unless yours has an electric
>pump to draw the exhaust gases through the tester. Mine has a 'pulse pump'
>arrangement whereby a one-way mechanical valve is opened and closed by the
>fluctuating pressure in the exhaust to 'pump' the gasses through the
tester.
>Once the probe is removed from the exhaust the system purges or not,
>depending on what the relative airpressures at the probe and the tester
are,
>irrespective of whether the tester is turned on or not.
>
>What I have noticed, particularly on the roadster, is that the reading
>varies considerably according to how far the probe is pushed in - the
>further the higher. There is no reference in the instructions as to how
far
>it should be pushed in.
>
>Cheers,
>PaulH.
>
>-----Original Message-----
>From: Erik Brzoska <mowog77@hotmail.com>
>To: mgs@autox.team.net <mgs@autox.team.net>
>Date: 28 December 1998 16:24
>Subject: Gunson Gas tester Discussion
>
>
>>I will warn you now, this is pretty long-winded, but if you have a gas
>>tester or are thinking about buying one, you may want to take five
>>minutes and read it.
>>
>>Before you start testing, you have to get the tester to calibrate and
>>settle at a reading of 2.0% in ambient air. Then you perform your tests,
>>then you have to let the Gas tester reacclimate itself before turning it
>>off, so you have to let it stand in clean open air for 10-15 minutes so
>>it recalibrates and purges itself for next time.
>>But also from this purge period, you can learn if the tester was out of
>>calibrartion at all.
>
>
|