Re: Hafler DH-500 thermal circuit breaker needed
From: Tim Schwartz (toschwartz_at_worldnet.att.net)
Date: 06/02/04
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Date: Wed, 02 Jun 2004 23:10:14 GMT
Robert,
You are correct about the temperature not being 80 degrees K, however
that is how the part is marked, it could be 80 degrees centigrade and
the /K could be a tolerance. However, at room temperature the part
should read as a short, and on the defective one the case is physically
burnt up. The one in the other channel is OK, though I do not have a
temperature probe to see at what temperature it trips open.
Regards,
Tim Schwartz
Bristol Electronics
Robert Gault wrote:
>
> Tim Schwartz wrote:
> > Hello all,
> >
> > I'm trying to find a replacement thermal circuit breaker (Schematic
> > location TB1 and TB2) for a Hafler DH-500 the part number is SF-024 in
> > the earlier manual, or 332002 in the later manual. The part is no
> > longer available from Hafler.
> >
> > The original is made by Elmwood Sensor, a division of Honeywell and is
> > a 2450 series (the number is molded into the plastic on the top of the
> > sensor). Other lettering around the side of the defective one is
> > "87-232 L167 80/K", where 87-232 is likely the date code (232nd day of
> > 1987), no idea about the L167, and 80/K the temperature where it trips.
> >
> > I've contacted Elmwood and the part is still available, with a $750
> > minimum order, so that is not one of my choices. I believe the DH-120,
> > DH-200, DH-220 and DH-500 all use the same part. Does anyone have a
> > parts unit that might have a good thermal circuit breaker that they
> > would be willing to part with? (Please note that on the DH-500 there is
> > also a thermal sensor to turn on the fan, which is NOT a substitute.)
> >
> > Thanks for your time,
> > Tim Schwartz
> > Bristol Electronics
>
> Whatever 80/K stands for it is not 80 deg K. A temp of 80 deg. K would
> be -193 deg C or -316 deg F!
>
> While the K is curious, 80 deg C at least would be a more reasonable
> temperature. Perhaps you can short out the bad sensor and measure the
> operating temperature of the heat sink during use with a thermocouple.
> Add some factor say 20% to the number and compare that to the
> temperature limit for the output MOSFETs. That would give you a
> temperature range for a substitute thermal sensor.
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