5800 Refrigerated Sampler Service Guide - Isco
5800 Refrigerated Sampler Service Guide - Isco
5800 Refrigerated Sampler Service Guide - Isco
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<strong>5800</strong> <strong>Refrigerated</strong> <strong>Sampler</strong> <strong>Service</strong> <strong>Guide</strong><br />
Section 3 Refrigeration System<br />
3.5 Refrigeration Cool<br />
Down Test<br />
Before beginning the cool down test, look inside the refrigerator<br />
to ensure that the evaporator fan is running.<br />
For the cool down test to pass, the temperature inside the refrigerator<br />
must drop at an average rate of at least 0.5 degrees per<br />
minute for 20 minutes.<br />
This test is accessed through the serial port (interrogator port)<br />
with a terminal emulation program such as Tera Term.<br />
To connect the sampler to a computer, use the optional serial<br />
communication cable, available with either DB-9 (69-5804-042)<br />
or USB (60-5804-177) connector.<br />
1. Configure your communications software for:<br />
· a baud rate no higher than 38,400<br />
· 8 data bits<br />
· no parity<br />
· 1 stop bit<br />
· No flow control<br />
· Auto Detect or VT100 terminal emulation.<br />
2. Using your communications software, connect to the sampler.<br />
Repeatedly type “?” (Shift + ?) using the computer<br />
keyboard until the sampler returns its banner string. The<br />
banner string lists the model number and unique ID of the<br />
sampler.<br />
A “>” prompt will appear on the screen when it is ready to<br />
accept commands.<br />
3. At the prompt, enter the command COOL. This test<br />
sequence takes 20 minutes to complete.<br />
Following the command, it will generally take 1 to 2 minutes<br />
for the compressor to start. At this time, the starting<br />
temperatures of the refrigerator and evaporator are sent to<br />
the computer, along with a header row for four tabular columns.<br />
Every minute, a row will be added to the table with<br />
the run time, current temperature, difference between the<br />
current and start temperature, and average rate of change.<br />
At the end of the test, if the rate of change was within the<br />
acceptable range, the message COOLDOWN TEST<br />
PASSED! will appear. If not, the message COOLDOWN<br />
TEST FAIL! will appear.<br />
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