2.
Photometer Preparation and Testing
2.1.
Remove the cover from the batteries compartment. Insert 4 AA batteries into the
compartment, or connect the AC adapter to the power socket.
2.2.
Press on the ON button. On the display will appear “Self –Diagnostic”. The battery status
and all wavelengths values will be displayed. If the instrument works promptly after 25 sec on
the display will appear starting wavelength value xxx nm.
2.3.
If the display says “Defective xxx nm source” (where xxx --- the wavelength of the defective
source), you have to send the device to the repair service for a replacement.
2.4.
If you will read on the display “Defective photo element” the device should be sent for
repairing.
2.5.
If “Low battery” will be displayed on the screen it means that there is insufficient voltage.
In this case you have to replace the batteries.
2.6.
To return to the wavelength selection, press the "CANCEL" button.
2.7.
To turn on the backlight, press and hold the "ENTER" key until the display lights up. Turn
off the backlight by pressing again and holding down the "ENTER" button until light goes out.
2.8.
To turn the device off, press and hold the "OFF" key for 2 seconds.
3.
Calibration and Measurements
3.1.
Prepare standard solutions for the photometer calibration according to the selected
measurement procedures.
3.2.
Turn on the photometer by pressing the "ON".
3.3.
Once the screen displays "xxx nm" (where xxx --- automatically selected wavelength value of
the first starting set) find the required wavelength by pressing the «←» and «→».
3.4.
Transfer 2---3 mL of the background solution to a 10 mm standard cuvette. Insert a cuvette
with the background solution in the cuvette compartment and put a cap on the cuvette. The
orientation of the acrylic cuvette transparent planes should be toward the keypad.
3.5.
Press the "ENTER" key. The screen of the instrument will display "Measure background?"
Press the “ENTER” button again to confirm. The screen will return in a countdown time mode,
after the screen will display "Background measured." * *
3.6.
Insert the cuvette containing 2---3 mL of a sample solution (first standard) into the cuvette
compartment. Put a cup on the cuvette. Press the "ENTER" key. The screen of the instrument