From: Jim Thompson
Subject: Re: Heater required
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Date: Tue, 31 Dec 2002 16:03:19 GMT
NNTP-Posting-Date: Tue, 31 Dec 2002 11:03:19 EST
Organization: Cox Communications
On Mon, 30 Dec 2002 00:34:30 -0500,
In Newsgroup: sci.electronics.design,
Entitled: "Heater required",
Wrote the following:
|At work, we repair a industrial unit that our customers like to use in a
|refrigerator. Unfortunately, the units are not designed to operate at such
|temperatures, and the vacuum pumps often stall. Even when we use thinner oil
|in the pumps, they often still stall, either blowing fuses, or even worse,
|killing the motors.
|Is it possible to SLIGHTLY raise the inner temperature of these units(the
|case is only about 2 feet square) with a fan, and a couple of power
|resistors?. These units run off of either 120VAC, or 220VAC (they are wired
|at the factory to run on one of these 2 voltages, not both) at 60 hz. We
|have tried small heaters, but these are too aggressive, often overheating
|the unit, so we think that we only need a few degrees of gentle heat. I can
|make a simple temperature controlled on/off switch, (with a Op-Amp, and a
|thermistor) that would turn off the heat, once the interior is up to the
How about a dip stick heater for the oil sump?
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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