Instrumentation Port - Thermo Scientific 815 Operating And Maintenance Manual

Explanation of Auxiliary
Panel (continued)

Instrumentation Port

Thermo Scientific
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.
4) Recorder Output - This is a DC millivolt output which represents the
temperature of the incubator. The recommended main use of this is
with a chart recorder having an input impedance of at least 1 megohm.
The scaled temperature output change is 10 millivolt/degree C. When
the incubator is operating at a negative temperature, the chart recorder
output is still positive. Use the chart below to relate temperature to
output voltage.
Located on the chart recorder printed circuit board is an offset
potentiometer R3. If, for some reason, the recorder output voltage
does not match the temperature as shown in the chart, this
potentiometer can be used to tune it in.
When connecting a chart recorder to the recorder output connector, it
is recommended to use a shielded cable with the shield grounded at
the chart recorder and to keep the cable short as possible.
Located on the rear side of the incubator is an instrumentation port for the
user to insert sensor wires, external meter leads, etc. into the chamber. The
rubber plug provided must always be used in this port to insure the
uniformity specifications. An extra plug is supplied for the user's
convenience. Be sure to seal any gaps around the wire(s) going through the
plug.
Section 1
Installation and Start-Up
Refrigerated Incubator 1-5