Instruction manual
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  This screen will be followed by a screen showing 
the first instrument setup choices. 
  Note: Pressing the mode button at any time 
cancels the Instrument Setup mode. The 
instrument will display a screen indicating 
setup “Unchanged”. This screen will be 
followed by another announcing “Begin 
Shut Down, Please Wait”. The instrument 
will then turn itself off. 
(5) Press “Cal” to begin the re-initialization 
sequence. The display will briefly show the 
“Initialization Warning” screen. 
  This screen will be followed by the “Initialization” 
screen. Press Mode to cancel the initialization 
or 
Press Mode to cancel the initialization or press 
the "Cal" button to re-initialize the PhD Ultra. 
The screen will briefly show the message 
“Initializing”. 
(7) The instrument will turn itself off when re-
initialization is complete. 
4.5 Record keeping 
4.5.1  PhD Ultra datalogging overview 
Whenever the PhD Ultra is turned on, the 
datalogger automatically records gas readings, turn-
on / turn-off times, temperatures, battery conditions, 
the 8 most recent calibration dates and settings, 
types of sensors currently installed, sensor serial 
numbers, warranty expiration and service due dates, 
temperature compensation curves, and current 
alarm settings. 
If a sensor is changed or replaced, the PhD Ultra 
notes that a change has occurred, displays a “Needs 
Cal” message the next time the instrument is turned 
back on, and identifies the affected sensors. Even if 
the change is only to replace one sensor with 
another of the same kind, the PhD Ultra will still 
note the change in serial numbers of the sensors 
installed, and display the “Needs Cal” message. 
The PhD Ultra can store the exposure values for up 
to 3,600 data intervals. This is enough for the 
storage of up to 60 hours of four gas monitoring 
broken into as many as 45 individual monitoring 
"sessions" when a one minute logging interval is 
specified. Using a longer datalogging interval 
increases the length of monitoring time for which 
data may be stored. For instance, if a datalogging 
interval of two minutes is selected 120 hours of 
monitoring data may be stored. 
Datalogging is a "transparent" function that is 
continually in operation. As long as the datalogger 
has not been disabled, the instrument will begin 
recording data as soon as the instrument is turned 
on. The information stored by the datalogger may 
be downloaded to a Windows-compatible PC to 
create a permanent record, or directly displayed by 
the PhD Ultra. 
4.5.2  Optional Datalink and Gas Detection 
Database Software Kit 
Biosystems optional “Datalink” kits allows two-way 
communication between your PhD Ultra and an IBM 
compatible personal computer. Two kits are 
available: The “Datalink Software Kit” (part number 
54-05-K0201) includes software, interface cable and 
reference manual. The “Datalink Kit” (part number 
54-05-K0203) includes software, interface cable and 
reference manual as well as a “Datadock” fast 
charger / computer interface cradle. 
Datalink software serves two basic functions: getting 
stored information out of the instrument and into 
your computer, and using files stored in your 
computer to setup or "program" your PhD Ultra. 
It is important to note that it is not necessary to use 
the Datalink software to program your instrument. 
Configuration and setup options may be 
programmed directly by using the built-in buttons on 
the instrument keypad. 
On the other hand, Datalink software has been 
designed to make programming, downloading, and 
data analysis as easy as pushing a button. The 
software allows optional instrument setups to be 
created by filling out forms right on the computer 
screen. 
Most functions (such as downloading stored 
information from the instrument to your PC, or 
uploading configuration setup files from your PC to 
the instrument) are automatic. 
Once information has been "downloaded" to the 
computer, it may be used for a variety of purposes. 
Data may be displayed and reviewed in detail 
through the computer monitor screen, or used to 
automatically generate and print reports, tables and 
graphs of time history exposure data. It is also 
possible to export records to other software 
applications in the form of ASCII text or a 
spreadsheet format. Another option is to simply 
retain the downloaded records for later use. 
Note: The material in this section is primarily 
designed to acquaint our customers with 










