7.1.2PERIOD
The logging time that begins when the instrument is turned on and initiates normal operation and lasts until the instrument is turned off.
7.1.3LOGGING SESSION
One or more periods of normal instrument operation between hygiene function resets.
7.1.4REAL TIME CLOCK
The internal clock that maintains the current time.
7.1.5LOG TIME CLOCK
The running clock that monitors the length of time logged during a session.
7.1.6CALENDAR
A part of the real time clock that maintains the current date.
7.1.7TWA
The accumulated gas exposure averaged over a predetermined time, typically eight hours.
7.1.8STEL (SHORT TERM EXPOSURE LIMIT)
The accumulated gas exposure value averaged for the proceeding fifteen minutes.
7.2PRINCIPLES OF OPERATION
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.
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.
7.3RESETTING THE HYGIENE FUNCTIONS
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
7.4DOWNLOADING 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
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