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No. Description Function
1 PRINTER PORT Port is for legacy printer (Model 020030), an accessory for early
Model 1027 radon monitors. Current printer connects to DATA
port.
2 DATA PORT RS-232 data port provides a way to transfer information from
Model 1027 to a laptop or personal computer. The information
transferred is identical to that sent through the printer port. (See
Set Up Communication on page 6.)
3 BATTERY
ON-OFF
Switch connects and disconnects the battery. When ON, the
battery powers Model 1027 whenever mains power is not
available. When OFF, the battery does not power Model 1027
when mains power is disconnected. Switch should be in the
OFF position when Model 1027 is not deployed for a test. This
is important for two reasons: first, battery life will be reduced,
and second, Model 1027 will continue acquiring measurements
as long as battery power is available, which could inadvertently
affect the results of a recent test. A fresh battery provides about
20 hours of backup power if mains power fails.
4 TOP PANEL-
ENABLE/
DISABLE
Key switch enables and disables digital display and buttons on
Model 1027 top panel. When in DISABLE position, Model
1027’s measurement performance is not affected. Model 1027
will function effectively in either key position. This feature is
designed to mitigate the temptation to tamper with a test.
5 DISPLAY 3-digit LED display. Three decimal points display when AVG or
CUR is pressed after memory is cleared.
6 pCi/l Picocuries per liter – the units of radon gas concentration shown
on the display.
7 AVG When pressed, the measured long-term average radon gas
concentration in pCi/l is displayed on the 3-digit display. This is
the cumulative average of the entire period since the memory
was last cleared. This value is not lost if the Model 1027 loses
all power.
8 CUR When pressed, the measured short-term radon gas
concentration is displayed. This is a rolling average of the most
recent 12 hours. This value is lost if the Model 1027 loses
power.
9 PRINT or
CLEAR
Function as PRINT and CLEAR buttons only when yellow LED is
flashing. To access this mode, hold both buttons down until
yellow LED turns on. Then release buttons, and yellow LED
begins to flash.
10 CLEAR Yellow LED must be flashing: When pressed, yellow LED turns
off. Hold down until yellow LED turns on again; then release.
Yellow LED and display LEDs flash once followed by a single
flash of yellow LED. Model 1027 memory is cleared.
Disturbance switch is inactive for the next 15 seconds.
11 PRINT Yellow LED must be flashing: When pressed, Model 1027
sends a report of the data contained in memory to PRINTER and
DATA ports. When button is pressed, yellow LED turns on.
When released, LED turns off and data transfer begins. When
data transfer is complete, yellow LED flashes once.
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