Energizer ATX612 - Manual (Page 12)

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The datalogging section of the instrument is always
powered and a battery backup circuit protects it from loss
of data for up to 40 minutes during battery changes.
NOTE: The instrument must be stored on a battery
charger when not in use to prevent loss of data
due to battery discharge.
7.3 R ESETTING THE H YGIENE F UNCTIONS
NOTE: If you are using the datalogging feature, be sure
the correct date and time are programmed by
checking/setting the Real Time Clock and
Calendar using the optional ATX
Hygiene/Datalogging Software.
• Press MODE repeatedly to step to the HYGIENE screen.
• Press (E) to reset the hygiene function and begin a new
datalogging session.
The instrument display will return to the LOG TIME
mode and the display will indicate that the log time (LT)
will be reset to 00:00. The TWA and STEL values for all
toxic sensors will also be reset to zero.
If there is insufficient memory to log approximately 12
hours of data when the hygiene function is reset, the real
time clock value will be displayed as RTOR:OR.
When the memory is full, both the real time and log time
will be displayed as OR:OR. At this time, the data may be
cleared by performing a hygiene reset as described above.
All currently stored data will be overwritten. The stored
data may be down-loaded using the ATX
hygiene/datalogging software.
7.4 D OWNLOADING THE ATX612
To connect the ATX612 for downloading data to the PC:
• Start the datalog software on the PC.
• Connect the interface cable to the infrared data port on
the bottom of the ATX612.
• Select CONNECT from the menu on the datalog
software.
• Turn on the instrument when prompted.
• The ATX612 will show CONNECT and the instrument
will begin communicating with the PC.
R T 0 6 : 4 5
L T 0 0 : 0 0
R T O R : O R
L T 0 0 : 0 0
R T O R : O R
L T 0 R : 0 R
7.1.2 PERIOD
The logging time that begins when the instrument is
turned on and initiates normal operation and lasts until the
instrument is turned off.
7.1.3 LOGGING SESSION
One or more periods of normal instrument operation
between hygiene function resets.
7.1.4 REAL TIME CLOCK
The internal clock that maintains the current time.
7.1.5 LOG TIME CLOCK
The running clock that monitors the length of time logged
during a session.
7.1.6 CALENDAR
A part of the real time clock that maintains the
current date.
7.1.7 TWA (TIME-WEIGHTED AVERAGE)
The accumulated gas exposure averaged over a
predetermined time, typically eight hours.
7.1.8 STEL (SHORT TERM EXPOSURE LIMIT)
The accumulated gas exposure value averaged for the
proceeding fifteen minutes.
7.2 P RINCIPLES OF O PERATION
If the ATX612 is equipped with the hygiene/datalogging
option, all sensor readings are sent to the hygiene module.
Once every minute the readings are averaged, saved to the
memory and the TWA and STEL values are calculated for
the toxic sensors. The TWA and STEL values are then
tested for possible alarm conditions.
The default time base for calculating TWA values is eight
hours. However, the time base may be changed to any
value in the range from one to 40 hours using the
optional ATX Hygiene/Datalogging Software and a
personal computer.
The instrument memory provides storage capacity for
approximately 110 hours of logged data in an instrument
with four sensors installed.