14
Clear Memory
1 Press and hold both buttons on top of Model 1027 until yellow LED turns on,
then release both buttons. Yellow LED flashes.
2 While yellow LED is flashing, press and hold CLEAR button. Yellow LED
initially turns off; then turns on solid, not flashing.
3 Release CLEAR button when yellow LED turns on solid.
4 When yellow LED and display LEDs flash, followed by a single flash of yellow
LED, memory is cleared.
Conduct Test
1 If desired, switch on backup battery. A fresh battery provides about 20 hours
of back-up operation.
2 Turn TOP PANEL switch to DISABLE, then remove key.
3 At end of monitoring period, insert TOP PANEL key and turn to ENABLE.
Display Results
1 Press AVG to display the average radon concentration in pCi/l over the total
monitoring period.
2 Press CUR to display the radon concentration in the current 12-hour period.
3 To print results, review Delayed Results below before proceeding to Reports
on page 17. Or, record results on a piece of paper for a handwritten report.
Note: When Model 1027 is powered on, a tamper sensor is always
active except for a 15-second period immediately following a CLEAR
memory procedure. To avoid a tamper notation on the first reading,
do not move Model 1027 once the tamper sensor is active.
Note: To test tamper sensor, CLEAR memory and conduct a test for
several hours. During the test, try lifting or sliding Model 1027. In the
printed results, a âTâ should appear in the interval when the
disturbance was made.
Note: The AVG and CUR display values continue to update during the
entire test, even if the test period exceeds the maximum storage of
90 intervals. The interval storage stops updating after 90 intervals until
the next memory clear.
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