4700 Refrigerated Sampler Service Guide
Section 3 Refrigeration System
3-22
3.5 Refrigeration Cool
Down Test
Before beginning the cool down test, look inside the refrigerator
to ensure that the evaporator fan is running.
For the cool down test to pass, the temperature inside the refrig-
erator must drop at an average rate of at least 0.5 degrees per
minute for 20 minutes.
This test is accessed through the serial port (interrogator port)
with a terminal emulation program such as HyperTerminal.
To connect the sampler to a computer, use the optional 3.8 m
(12.5 ft) RS-232 serial communication cable, 69-4704-042. This
cable connects to the DB9-pin serial port connection on a com-
puter. Connections to a computer without the DB9-pin serial port
will require a user-supplied USB to serial port adapter.
1. Configure your communications software for:
·
a baud rate no higher than 38,400
·
8 data bits
·
no parity
·
1 stop bit
·
No flow control
·
Auto Detect or VT100 terminal emulation.
2. Using your communications software, connect to the sam-
pler. Repeatedly type “?” (Shift + ?) using the computer
keyboard until the sampler returns its banner string. The
banner string lists the model number and unique ID of the
sampler.
A “>” prompt will appear on the screen when it is ready to
accept commands.
3. At the prompt, enter the command COOL<CR>. This test
sequence takes 20 minutes to complete.
Following the command, it will generally take 1 to 2 min-
utes for the compressor to start. At this time, the starting
temperatures of the refrigerator and evaporator are sent to
the computer, along with a header row for four tabular col-
umns. Every minute, a row will be added to the table with
the run time, current temperature, difference between the
current and start temperature, and average rate of change.
At the end of the test, if the rate of change was within the
acceptable range, the message COOLDOWN TEST
PASSED! will appear. If not, the message COOLDOWN
TEST FAIL! will appear.
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