
CI-154 User’s Manual
Page 79
7.
Frequently asked questions
When I press a key, sometimes a different key responds.
The manner in which a touch screen detects a key press makes it susceptible
to error if the key is pressed too slowly or too gently. To assure a correct
response, the key should be pressed firmly, rather than gently, and
resolutely, rather than hesitantly. If you encounter problems, a little practice
will help you determine how to press the key in a way that produces
consistent, positive results.
All the settings disappear when I turn the unit off.
Memory is backed up by a separate battery that maintains power to the RAM
chip when the unit is turned off. When this battery voltage is depleted, the
unit will lose all settings and stored data whenever the unit is powered down.
The battery will last up to 8 years. Actual time will vary in part depending on
how much time the unit is off each day. To avoid loss of data, it would be
advisable to request battery (P/N 36002601) replacement at 5 year intervals,
in conjunction with routine calibration.
The counts on the display jump up and down, increasing and decreasing.
This is normal when the unit is set for counts per unit volume. The particle
counter calculates the number of particles per unit volume each second. Since
the displayed counts represent the calculated counts per unit volume, and
since the number of particles per unit volume is dynamic and constantly
changing, the numbers on the display will increase or decrease from one
second to the next to reflect the change in concentration from moment to
moment. At the end of a cubic meter or cubic foot sample, the displayed
counts would be the same, whether the unit was set for
TOTAL COUNTS
, or
COUNTS
/CF, or
COUNTS
/CM.
If I select concentration display mode (
COUNTS
/
CF
) will the data sent to the
computer be the raw (
TOTAL
) counts, or will it also be sent to the computer as
calculated total counts?
The counts that are printed and sent to the computer will be in the same
format as is displayed. If you set the display to
COUNTS
/CF, then the display,
the printout, and the data sent to the computer will be in the (calculated)
concentration format.
How can I tell whether my data was stored as concentration data or as raw count
data?
All count data is stored as raw count data. It is then displayed, printed, or
transmitted according to the current settings by making the necessary
conversions on the fly while sending the data to its destination.
Does the CI-154 comply with 21 CFR 11?
REPORTS
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