21
3
Photometer 7500 BT
Prepare a Sample cuvette following the method
instructions provided in the Palintest Phot Book.
Select
Read
at the base of the screen and press
OK
.
At the
Insert sample
prompt, insert the sample
cuvette ensuring it is clean and dry and oriented
correctly using the location mark.
Press OK to begin the measurement process.
The screen will display Reading...
At the completion of the measurement process
the result is displayed on screen.
Timer
Many photometric methods require a reaction time
to develop optimise sensitivity, the recommended
time period being documented in the Palintest Phot
Book and included as part of the method parameters
programmed into the Photometer 7500 Bluetooth.
Tests requiring a reaction time will have the option to
select an automatic timer to count down the reaction
time required. While in the Insert sample screen use
the right key to move the cursor to highlight
Timer
.
The programmed reaction time will be displayed.
Press OK to Start the countdown.
Three options will be displayed:
Stop
cancel the countdown timer
Exit
exits the countdown screen and
returns to the Insert sample
screen. The countdown will
continue and the current time can
be seen by selecting
Timer
. At the
end of the countdown an audible
alarm will sound to indicate the
sample is ready to read. Select
OK to read the sample manually.
Exit and Read
exits the countdown screen and
automatically reads the sample
at the completion of the allocated
time period.
Changing Result Units of Expression
Many chemical species have a number of
alternative units that can be used for reporting
results e.g. Phosphate can be expressed as
PO
4
or P for example.
