2
Zeroing is accomplished by means of a hand-inflatable “zero air” pouch included
with the model
p
DR-1000AN, and by an inlet filter cartridge provided with the
model
p
DR-1200. In addition, the instrument automatically checks agreement with
its original factory calibration by checking its optical background during the zeroing
sequence.
The
personal
DataRAM covers a wide measurement range: from 0.001 mg/m
3
(1
µg/m
3
) to 400 mg/m
3
, a 400,000-fold span, corresponding to very clean air up to
extremely high particle levels.
In addition to the auto-ranging real-time concentration readout, the
personal
DataRAM offers the user a wide range of information by scrolling its two-
line LCD screen, such as run start time and date, time averaged concentration,
elapsed run time, maximum and STEL values with times of occurrence, etc.
Operating parameters selected and diagnostic information displays are also available.
Furthermore, the
personal
DataRAM features complete, large capacity internal data
logging capabilities with retrieval through an externally connected computer. The
stored information (up to 13,000 data points) includes average concentration values,
maximum and STEL values with time information as well as tag numbers.
Selectable alarm levels with built-in audible signal and switched output, a RS-232
communications port, and a programmable analog concentration output (voltage and
current) are all part of this versatile instrument.
A custom software package is provided with the
personal
DataRAM to program
operating/logging parameters (e.g. logging period, alarm level, concentration display
averaging time, etc.) as well as to download stored or real-time data to a PC or
laptop for tabular and/or graphic presentation. If required, the data can also be
imported to standard spreadsheet packages (e.g. Microsoft Excel™, IBM Lotus 1-2-
3™, etc.).
