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Path: utzoo!utgpu!water!watnot!watmath!clyde!cbatt!ihnp4!kitty!larry
From: larry@kitty.UUCP
Newsgroups: comp.misc
Subject: Re: Computer Thermometer
Message-ID: <1676@kitty.UUCP>
Date: Tue, 31-Mar-87 14:18:02 EST
Article-I.D.: kitty.1676
Posted: Tue Mar 31 14:18:02 1987
Date-Received: Fri, 3-Apr-87 01:22:53 EST
References: <128@dvm.UUCP>
Organization: Recognition Research Corp., Clarence, NY
Lines: 31
Keywords: Thermometer, Instrument, RS-232
Summary: Here it is, but it ain't cheap...

In article <128@dvm.UUCP>, frank@dvm.UUCP (Frank Wortner) writes:
> I am looking for a thermometer which reads out air temperature over a
> RS-232 port.  I would like to use such a device to monitor the temperature
> in a computer room.  Once the thermometer indicates a temperature above a
> safe maximum, the computer it was connected to could shut down itself and
> any other computers in the room.  I have everything I need to implement this
> scheme but the thermometer.  Does anybody out there know of any?

	Contact a company called Omega Engineering, Inc., P. O. Box 4047,
Stamford, CT 06907, or telephone 203/359-1660.
	Omega is a large manufacturer of temperature measurement apparatus;
they have a number of products which can solve your problem, but the lowest
cost route is probably a combination of P/N 115-TC type-T thermocouple digital
indicator whose analog output is connected to a P/N WB-31 analog -> RS-232
interface.  The 115-TC is around $ 189.00, and the WB-31 is around $ 495.00.
In addition, you will need a type-T thermocouple for around $ 25.00.
	I have used a less expensive method to accomplish pretty much the
same thing.  Get a good-quality thermostatic switch with a calibrated dial
from an industrial supply house (NOT a home thermostat!); use a vendor like
Chromalux or Allen-Bradley.  Connect the isolated contacts of the switch
to an unused RS-232 port so that reaching the temperature setpoint will
assert the carrier-detect lead on the port.  Use a simple daemon to scan
the RS-232 port for presence of carrier (use a getphys() function or other
means to sense the carrier-detect pin); if the pin is on, then you have a
temperature alarm.  The cost of such a good quality thermostatic switch is
around $ 50 to $ 60.

<>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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