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Thermo Scientific 3721 - Explanation of Auxiliary Panel

Thermo Scientific 3721
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1-4 Low Temp Incubator Thermo Scientific
Section 1
Installation and Start-Up
On the left side of the incubator control panel, there is an auxiliary panel
which has the items shown in the illustration below. They are described as
follows:
1) Fuse - This fuse is in line with the main power cord that comes into the
incubator. The rating of this fuse is printed above the fuse holder. The
physical size of this fuse is 5 MM x 20 MM.
2) Alarm Relay - This Alarm Relay output is provided to the user for the
purpose of remotely monitoring the incubator in case of a high or low
temperature alarm condition. This alarm relay will operate just as the
audible alarm would. The contact itself is an isolated form C (normally
open/normally closed) dry contact. This contact is to be used for low
voltage class 2 connections only. The contact rating is 24 volts, 1.25
amps resistive. Typical usages of the output are shown below.
In the above configuration, the light will illuminate whenever the unit goes
into an alarm condition...High or Low.
In the configuration below, the light will go off in a high or low
temperature alarm condition.
Warning Wiring must conform to all local electrical codes.
3) RS-232 Output (Optional Kit P/N 3166245) - This output is used for
two way communications between the incubator and a personal
computer. With the use of communications/modem software program,
the user can record the temperature of the incubator at their selected
time periods and store it in a file for use with a spreadsheet program.
The user can also change the setpoint temperature from their personal
computer and periodically monitor the actual temperature, setpoint
temperature, and alarm status.
Explanation of Auxiliary
Panel
VOLTAGE SOURCE
VOLTAGE SOURCE

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